{"dataType": "CVE_RECORD", "dataVersion": "5.1", "cveMetadata": {"cveId": "CVE-2024-41070", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2024-07-12T12:17:45.630Z", "datePublished": "2024-07-29T14:57:30.952Z", "dateUpdated": "2024-09-11T17:34:00.946Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2024-07-29T14:57:30.952Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nKVM: PPC: Book3S HV: Prevent UAF in kvm_spapr_tce_attach_iommu_group()\n\nAl reported a possible use-after-free (UAF) in kvm_spapr_tce_attach_iommu_group().\n\nIt looks up `stt` from tablefd, but then continues to use it after doing\nfdput() on the returned fd. After the fdput() the tablefd is free to be\nclosed by another thread. The close calls kvm_spapr_tce_release() and\nthen release_spapr_tce_table() (via call_rcu()) which frees `stt`.\n\nAlthough there are calls to rcu_read_lock() in\nkvm_spapr_tce_attach_iommu_group() they are not sufficient to prevent\nthe UAF, because `stt` is used outside the locked regions.\n\nWith an artifcial delay after the fdput() and a userspace program which\ntriggers the race, KASAN detects the UAF:\n\n BUG: KASAN: slab-use-after-free in kvm_spapr_tce_attach_iommu_group+0x298/0x720 [kvm]\n Read of size 4 at addr c000200027552c30 by task kvm-vfio/2505\n CPU: 54 PID: 2505 Comm: kvm-vfio Not tainted 6.10.0-rc3-next-20240612-dirty #1\n Hardware name: 8335-GTH POWER9 0x4e1202 opal:skiboot-v6.5.3-35-g1851b2a06 PowerNV\n Call Trace:\n dump_stack_lvl+0xb4/0x108 (unreliable)\n print_report+0x2b4/0x6ec\n kasan_report+0x118/0x2b0\n __asan_load4+0xb8/0xd0\n kvm_spapr_tce_attach_iommu_group+0x298/0x720 [kvm]\n kvm_vfio_set_attr+0x524/0xac0 [kvm]\n kvm_device_ioctl+0x144/0x240 [kvm]\n sys_ioctl+0x62c/0x1810\n system_call_exception+0x190/0x440\n system_call_vectored_common+0x15c/0x2ec\n ...\n Freed by task 0:\n ...\n kfree+0xec/0x3e0\n release_spapr_tce_table+0xd4/0x11c [kvm]\n rcu_core+0x568/0x16a0\n handle_softirqs+0x23c/0x920\n do_softirq_own_stack+0x6c/0x90\n do_softirq_own_stack+0x58/0x90\n __irq_exit_rcu+0x218/0x2d0\n irq_exit+0x30/0x80\n arch_local_irq_restore+0x128/0x230\n arch_local_irq_enable+0x1c/0x30\n cpuidle_enter_state+0x134/0x5cc\n cpuidle_enter+0x6c/0xb0\n call_cpuidle+0x7c/0x100\n do_idle+0x394/0x410\n cpu_startup_entry+0x60/0x70\n start_secondary+0x3fc/0x410\n start_secondary_prolog+0x10/0x14\n\nFix it by delaying the fdput() until `stt` is no longer in use, which\nis effectively the entire function. To keep the patch minimal add a call\nto fdput() at each of the existing return paths. Future work can convert\nthe function to goto or __cleanup style cleanup.\n\nWith the fix in place the test case no longer triggers the UAF."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["arch/powerpc/kvm/book3s_64_vio.c"], "versions": [{"version": "1da177e4c3f4", "lessThan": "be847bb20c80", "status": "affected", "versionType": "git"}, {"version": "1da177e4c3f4", "lessThan": "4cdf6926f443", "status": "affected", "versionType": "git"}, {"version": "1da177e4c3f4", "lessThan": "b26c8c85463e", "status": "affected", "versionType": "git"}, {"version": "1da177e4c3f4", "lessThan": "5f856023971f", "status": "affected", "versionType": "git"}, {"version": "1da177e4c3f4", "lessThan": "82c7a4cf14aa", "status": "affected", "versionType": "git"}, {"version": "1da177e4c3f4", "lessThan": "9975f93c760a", "status": "affected", "versionType": "git"}, {"version": "1da177e4c3f4", "lessThan": "a986fa57fd81", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["arch/powerpc/kvm/book3s_64_vio.c"], "versions": [{"version": "5.4.281", "lessThanOrEqual": "5.4.*", "status": "unaffected", "versionType": "custom"}, {"version": "5.10.223", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "custom"}, {"version": "5.15.164", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "custom"}, {"version": "6.1.101", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "custom"}, {"version": "6.6.42", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "custom"}, {"version": "6.9.11", "lessThanOrEqual": "6.9.*", "status": "unaffected", "versionType": "custom"}, {"version": "6.10", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix"}]}], "references": [{"url": "https://git.kernel.org/stable/c/be847bb20c809de8ac124431b556f244400b0491"}, {"url": "https://git.kernel.org/stable/c/4cdf6926f443c84f680213c7aafbe6f91a5fcbc0"}, {"url": "https://git.kernel.org/stable/c/b26c8c85463ef27a522d24fcd05651f0bb039e47"}, {"url": "https://git.kernel.org/stable/c/5f856023971f97fff74cfaf21b48ec320147b50a"}, {"url": "https://git.kernel.org/stable/c/82c7a4cf14aa866f8f7f09e662b02eddc49ee0bf"}, {"url": "https://git.kernel.org/stable/c/9975f93c760a32453d7639cf6fcf3f73b4e71ffe"}, {"url": "https://git.kernel.org/stable/c/a986fa57fd81a1430e00b3c6cf8a325d6f894a63"}], "title": "KVM: PPC: Book3S HV: Prevent UAF in kvm_spapr_tce_attach_iommu_group()", "x_generator": {"engine": "bippy-c9c4e1df01b2"}}, "adp": [{"providerMetadata": {"orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2024-08-02T04:46:52.443Z"}, "title": "CVE Program Container", "references": [{"url": "https://git.kernel.org/stable/c/be847bb20c809de8ac124431b556f244400b0491", "tags": ["x_transferred"]}, {"url": "https://git.kernel.org/stable/c/4cdf6926f443c84f680213c7aafbe6f91a5fcbc0", "tags": ["x_transferred"]}, {"url": "https://git.kernel.org/stable/c/b26c8c85463ef27a522d24fcd05651f0bb039e47", "tags": ["x_transferred"]}, {"url": "https://git.kernel.org/stable/c/5f856023971f97fff74cfaf21b48ec320147b50a", "tags": ["x_transferred"]}, {"url": "https://git.kernel.org/stable/c/82c7a4cf14aa866f8f7f09e662b02eddc49ee0bf", "tags": ["x_transferred"]}, {"url": "https://git.kernel.org/stable/c/9975f93c760a32453d7639cf6fcf3f73b4e71ffe", "tags": ["x_transferred"]}, {"url": "https://git.kernel.org/stable/c/a986fa57fd81a1430e00b3c6cf8a325d6f894a63", "tags": ["x_transferred"]}]}, {"metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2024-41070", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2024-09-10T16:21:40.187466Z"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2024-09-11T17:34:00.946Z"}}]}}

{"dataType": "CVE_RECORD", "containers": {"adp": [{"title": "CVE Program Container", "references": [{"url": "https://git.kernel.org/stable/c/be847bb20c809de8ac124431b556f244400b0491", "tags": ["x_transferred"]}, {"url": "https://git.kernel.org/stable/c/4cdf6926f443c84f680213c7aafbe6f91a5fcbc0", "tags": ["x_transferred"]}, {"url": "https://git.kernel.org/stable/c/b26c8c85463ef27a522d24fcd05651f0bb039e47", "tags": ["x_transferred"]}, {"url": "https://git.kernel.org/stable/c/5f856023971f97fff74cfaf21b48ec320147b50a", "tags": ["x_transferred"]}, {"url": "https://git.kernel.org/stable/c/82c7a4cf14aa866f8f7f09e662b02eddc49ee0bf", "tags": ["x_transferred"]}, {"url": "https://git.kernel.org/stable/c/9975f93c760a32453d7639cf6fcf3f73b4e71ffe", "tags": ["x_transferred"]}, {"url": "https://git.kernel.org/stable/c/a986fa57fd81a1430e00b3c6cf8a325d6f894a63", "tags": ["x_transferred"]}], "providerMetadata": {"orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2024-08-02T04:46:52.443Z"}}, {"title": "CISA ADP Vulnrichment", "metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2024-41070", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2024-09-10T16:21:40.187466Z"}}}], "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2024-09-11T12:42:20.173Z"}}], "cna": {"title": "KVM: PPC: Book3S HV: Prevent UAF in kvm_spapr_tce_attach_iommu_group()", "affected": [{"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "1da177e4c3f4", "lessThan": "be847bb20c80", "versionType": "git"}, {"status": "affected", "version": "1da177e4c3f4", "lessThan": "4cdf6926f443", "versionType": "git"}, {"status": "affected", "version": "1da177e4c3f4", "lessThan": "b26c8c85463e", "versionType": "git"}, {"status": "affected", "version": "1da177e4c3f4", "lessThan": "5f856023971f", "versionType": "git"}, {"status": "affected", "version": "1da177e4c3f4", "lessThan": "82c7a4cf14aa", "versionType": "git"}, {"status": "affected", "version": "1da177e4c3f4", "lessThan": "9975f93c760a", "versionType": "git"}, {"status": "affected", "version": "1da177e4c3f4", "lessThan": "a986fa57fd81", "versionType": "git"}], "programFiles": ["arch/powerpc/kvm/book3s_64_vio.c"], "defaultStatus": "unaffected"}, {"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "unaffected", "version": "5.4.281", "versionType": "custom", "lessThanOrEqual": "5.4.*"}, {"status": "unaffected", "version": "5.10.223", "versionType": "custom", "lessThanOrEqual": "5.10.*"}, {"status": "unaffected", "version": "5.15.164", "versionType": "custom", "lessThanOrEqual": "5.15.*"}, {"status": "unaffected", "version": "6.1.101", "versionType": "custom", "lessThanOrEqual": "6.1.*"}, {"status": "unaffected", "version": "6.6.42", "versionType": "custom", "lessThanOrEqual": "6.6.*"}, {"status": "unaffected", "version": "6.9.11", "versionType": "custom", "lessThanOrEqual": "6.9.*"}, {"status": "unaffected", "version": "6.10", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*"}], "programFiles": ["arch/powerpc/kvm/book3s_64_vio.c"], "defaultStatus": "affected"}], "references": [{"url": "https://git.kernel.org/stable/c/be847bb20c809de8ac124431b556f244400b0491"}, {"url": "https://git.kernel.org/stable/c/4cdf6926f443c84f680213c7aafbe6f91a5fcbc0"}, {"url": "https://git.kernel.org/stable/c/b26c8c85463ef27a522d24fcd05651f0bb039e47"}, {"url": "https://git.kernel.org/stable/c/5f856023971f97fff74cfaf21b48ec320147b50a"}, {"url": "https://git.kernel.org/stable/c/82c7a4cf14aa866f8f7f09e662b02eddc49ee0bf"}, {"url": "https://git.kernel.org/stable/c/9975f93c760a32453d7639cf6fcf3f73b4e71ffe"}, {"url": "https://git.kernel.org/stable/c/a986fa57fd81a1430e00b3c6cf8a325d6f894a63"}], "x_generator": {"engine": "bippy-c9c4e1df01b2"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nKVM: PPC: Book3S HV: Prevent UAF in kvm_spapr_tce_attach_iommu_group()\n\nAl reported a possible use-after-free (UAF) in kvm_spapr_tce_attach_iommu_group().\n\nIt looks up `stt` from tablefd, but then continues to use it after doing\nfdput() on the returned fd. After the fdput() the tablefd is free to be\nclosed by another thread. The close calls kvm_spapr_tce_release() and\nthen release_spapr_tce_table() (via call_rcu()) which frees `stt`.\n\nAlthough there are calls to rcu_read_lock() in\nkvm_spapr_tce_attach_iommu_group() they are not sufficient to prevent\nthe UAF, because `stt` is used outside the locked regions.\n\nWith an artifcial delay after the fdput() and a userspace program which\ntriggers the race, KASAN detects the UAF:\n\n BUG: KASAN: slab-use-after-free in kvm_spapr_tce_attach_iommu_group+0x298/0x720 [kvm]\n Read of size 4 at addr c000200027552c30 by task kvm-vfio/2505\n CPU: 54 PID: 2505 Comm: kvm-vfio Not tainted 6.10.0-rc3-next-20240612-dirty #1\n Hardware name: 8335-GTH POWER9 0x4e1202 opal:skiboot-v6.5.3-35-g1851b2a06 PowerNV\n Call Trace:\n dump_stack_lvl+0xb4/0x108 (unreliable)\n print_report+0x2b4/0x6ec\n kasan_report+0x118/0x2b0\n __asan_load4+0xb8/0xd0\n kvm_spapr_tce_attach_iommu_group+0x298/0x720 [kvm]\n kvm_vfio_set_attr+0x524/0xac0 [kvm]\n kvm_device_ioctl+0x144/0x240 [kvm]\n sys_ioctl+0x62c/0x1810\n system_call_exception+0x190/0x440\n system_call_vectored_common+0x15c/0x2ec\n ...\n Freed by task 0:\n ...\n kfree+0xec/0x3e0\n release_spapr_tce_table+0xd4/0x11c [kvm]\n rcu_core+0x568/0x16a0\n handle_softirqs+0x23c/0x920\n do_softirq_own_stack+0x6c/0x90\n do_softirq_own_stack+0x58/0x90\n __irq_exit_rcu+0x218/0x2d0\n irq_exit+0x30/0x80\n arch_local_irq_restore+0x128/0x230\n arch_local_irq_enable+0x1c/0x30\n cpuidle_enter_state+0x134/0x5cc\n cpuidle_enter+0x6c/0xb0\n call_cpuidle+0x7c/0x100\n do_idle+0x394/0x410\n cpu_startup_entry+0x60/0x70\n start_secondary+0x3fc/0x410\n start_secondary_prolog+0x10/0x14\n\nFix it by delaying the fdput() until `stt` is no longer in use, which\nis effectively the entire function. To keep the patch minimal add a call\nto fdput() at each of the existing return paths. Future work can convert\nthe function to goto or __cleanup style cleanup.\n\nWith the fix in place the test case no longer triggers the UAF."}], "providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2024-07-29T14:57:30.952Z"}}}, "cveMetadata": {"cveId": "CVE-2024-41070", "state": "PUBLISHED", "dateUpdated": "2024-09-11T17:34:00.946Z", "dateReserved": "2024-07-12T12:17:45.630Z", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "datePublished": "2024-07-29T14:57:30.952Z", "assignerShortName": "Linux"}, "dataVersion": "5.1"}

{"configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "BCD1D392-BEF8-4D8D-B191-C64E1875241F", "versionEndExcluding": "5.4.281", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "12CD4E48-26A1-40B4-AF6A-1CC066193F4C", "versionEndExcluding": "5.10.223", "versionStartIncluding": "5.5", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "3D6B1E23-6E6C-4761-ACD4-EA687A95F56F", "versionEndExcluding": "5.15.164", "versionStartIncluding": "5.11", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "2B46438B-72B8-4053-8554-94AED3EB13EB", "versionEndExcluding": "6.1.101", "versionStartIncluding": "5.16", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "972274A2-D688-4C37-BE42-689B58B4C225", "versionEndExcluding": "6.6.42", "versionStartIncluding": "6.2", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "01E300B3-8B39-4A2D-8B03-4631433D3915", "versionEndExcluding": "6.9.11", "versionStartIncluding": "6.7", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nKVM: PPC: Book3S HV: Prevent UAF in kvm_spapr_tce_attach_iommu_group()\n\nAl reported a possible use-after-free (UAF) in kvm_spapr_tce_attach_iommu_group().\n\nIt looks up `stt` from tablefd, but then continues to use it after doing\nfdput() on the returned fd. After the fdput() the tablefd is free to be\nclosed by another thread. The close calls kvm_spapr_tce_release() and\nthen release_spapr_tce_table() (via call_rcu()) which frees `stt`.\n\nAlthough there are calls to rcu_read_lock() in\nkvm_spapr_tce_attach_iommu_group() they are not sufficient to prevent\nthe UAF, because `stt` is used outside the locked regions.\n\nWith an artifcial delay after the fdput() and a userspace program which\ntriggers the race, KASAN detects the UAF:\n\n BUG: KASAN: slab-use-after-free in kvm_spapr_tce_attach_iommu_group+0x298/0x720 [kvm]\n Read of size 4 at addr c000200027552c30 by task kvm-vfio/2505\n CPU: 54 PID: 2505 Comm: kvm-vfio Not tainted 6.10.0-rc3-next-20240612-dirty #1\n Hardware name: 8335-GTH POWER9 0x4e1202 opal:skiboot-v6.5.3-35-g1851b2a06 PowerNV\n Call Trace:\n dump_stack_lvl+0xb4/0x108 (unreliable)\n print_report+0x2b4/0x6ec\n kasan_report+0x118/0x2b0\n __asan_load4+0xb8/0xd0\n kvm_spapr_tce_attach_iommu_group+0x298/0x720 [kvm]\n kvm_vfio_set_attr+0x524/0xac0 [kvm]\n kvm_device_ioctl+0x144/0x240 [kvm]\n sys_ioctl+0x62c/0x1810\n system_call_exception+0x190/0x440\n system_call_vectored_common+0x15c/0x2ec\n ...\n Freed by task 0:\n ...\n kfree+0xec/0x3e0\n release_spapr_tce_table+0xd4/0x11c [kvm]\n rcu_core+0x568/0x16a0\n handle_softirqs+0x23c/0x920\n do_softirq_own_stack+0x6c/0x90\n do_softirq_own_stack+0x58/0x90\n __irq_exit_rcu+0x218/0x2d0\n irq_exit+0x30/0x80\n arch_local_irq_restore+0x128/0x230\n arch_local_irq_enable+0x1c/0x30\n cpuidle_enter_state+0x134/0x5cc\n cpuidle_enter+0x6c/0xb0\n call_cpuidle+0x7c/0x100\n do_idle+0x394/0x410\n cpu_startup_entry+0x60/0x70\n start_secondary+0x3fc/0x410\n start_secondary_prolog+0x10/0x14\n\nFix it by delaying the fdput() until `stt` is no longer in use, which\nis effectively the entire function. To keep the patch minimal add a call\nto fdput() at each of the existing return paths. Future work can convert\nthe function to goto or __cleanup style cleanup.\n\nWith the fix in place the test case no longer triggers the UAF."}, {"lang": "es", "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: KVM: PPC: Book3S HV: Prevenir UAF en kvm_spapr_tce_attach_iommu_group() Al inform\u00f3 un posible use after free (UAF) en kvm_spapr_tce_attach_iommu_group(). Busca `stt` en tablefd, pero luego contin\u00faa us\u00e1ndolo despu\u00e9s de realizar fdput() en el fd devuelto. Despu\u00e9s de fdput(), otro hilo puede cerrar el tablefd. El cierre llama a kvm_spapr_tce_release() y luego a release_spapr_tce_table() (a trav\u00e9s de call_rcu()) que libera `stt`. Aunque hay llamadas a rcu_read_lock() en kvm_spapr_tce_attach_iommu_group(), no son suficientes para evitar la UAF, porque `stt` se usa fuera de las regiones bloqueadas. Con un retraso artificial despu\u00e9s de fdput() y un programa de espacio de usuario que desencadena la ejecuci\u00f3n, KASAN detecta la UAF: ERROR: KASAN: slab-use-after-free in kvm_spapr_tce_attach_iommu_group+0x298/0x720 [kvm] Lectura de tama\u00f1o 4 en direcci\u00f3n c000200027552c30 por tarea kvm-vfio/2505 CPU: 54 PID: 2505 Comm: kvm-vfio Not tainted 6.10.0-rc3-next-20240612-dirty #1 Nombre de hardware: 8335-GTH POWER9 0x4e1202 opal:skiboot-v6.5.3-35 -g1851b2a06 Seguimiento de llamadas de PowerNV: dump_stack_lvl+0xb4/0x108 (no confiable) print_report+0x2b4/0x6ec kasan_report+0x118/0x2b0 __asan_load4+0xb8/0xd0 kvm_spapr_tce_attach_iommu_group+0x298/0x720 [kvm] kvm_vfio_set_attr+0x524/0xac0 [kvm] kvm_device_ioctl+0x144/0x240 [kvm] sys_ioctl+0x62c/0x1810 system_call_exception+0x190/0x440 system_call_vectored_common+0x15c/0x2ec ... Liberado por la tarea 0: ... kfree+0xec/0x3e0 release_spapr_tce_table+0xd4/0x11c [rcu_core+0x568/0 x16a0 handle_softirqs+0x23c /0x920 do_softirq_own_stack+0x6c/0x90 do_softirq_own_stack+0x58/0x90 __irq_exit_rcu+0x218/0x2d0 irq_exit+0x30/0x80 arch_local_irq_restore+0x128/0x230 arch_local_irq_enable+0x1c/0x 30 cpuidle_enter_state+0x134/0x5cc cpuidle_enter+0x6c/0xb0 call_cpuidle+0x7c/0x100 do_idle+0x394 /0x410 cpu_startup_entry+0x60/0x70 start_secondary+0x3fc/0x410 start_secondary_prolog+0x10/0x14 Solucionarlo retrasando fdput() hasta que `stt` ya no est\u00e9 en uso, que es efectivamente toda la funci\u00f3n. Para mantener el parche m\u00ednimo, agregue una llamada a fdput() en cada una de las rutas de retorno existentes. El trabajo futuro puede convertir la funci\u00f3n a limpieza de estilo goto o __cleanup. Con la soluci\u00f3n implementada, el caso de prueba ya no activa la UAF."}], "id": "CVE-2024-41070", "lastModified": "2024-08-22T14:05:32.407", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 5.9, "source": "nvd@nist.gov", "type": "Primary"}]}, "published": "2024-07-29T15:15:14.787", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/4cdf6926f443c84f680213c7aafbe6f91a5fcbc0"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/5f856023971f97fff74cfaf21b48ec320147b50a"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/82c7a4cf14aa866f8f7f09e662b02eddc49ee0bf"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/9975f93c760a32453d7639cf6fcf3f73b4e71ffe"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/a986fa57fd81a1430e00b3c6cf8a325d6f894a63"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/b26c8c85463ef27a522d24fcd05651f0bb039e47"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/be847bb20c809de8ac124431b556f244400b0491"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-416"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: KVM: PPC: Book3S HV: Prevent UAF in kvm_spapr_tce_attach_iommu_group()", "id": "2300447", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2300447"}, "csaw": false, "cvss3": {"cvss3_base_score": "6.4", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H", "status": "draft"}, "cwe": "CWE-416", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nKVM: PPC: Book3S HV: Prevent UAF in kvm_spapr_tce_attach_iommu_group()\nAl reported a possible use-after-free (UAF) in kvm_spapr_tce_attach_iommu_group().\nIt looks up `stt` from tablefd, but then continues to use it after doing\nfdput() on the returned fd. After the fdput() the tablefd is free to be\nclosed by another thread. The close calls kvm_spapr_tce_release() and\nthen release_spapr_tce_table() (via call_rcu()) which frees `stt`.\nAlthough there are calls to rcu_read_lock() in\nkvm_spapr_tce_attach_iommu_group() they are not sufficient to prevent\nthe UAF, because `stt` is used outside the locked regions.\nWith an artifcial delay after the fdput() and a userspace program which\ntriggers the race, KASAN detects the UAF:\nBUG: KASAN: slab-use-after-free in kvm_spapr_tce_attach_iommu_group+0x298/0x720 [kvm]\nRead of size 4 at addr c000200027552c30 by task kvm-vfio/2505\nCPU: 54 PID: 2505 Comm: kvm-vfio Not tainted 6.10.0-rc3-next-20240612-dirty #1\nHardware name: 8335-GTH POWER9 0x4e1202 opal:skiboot-v6.5.3-35-g1851b2a06 PowerNV\nCall Trace:\ndump_stack_lvl+0xb4/0x108 (unreliable)\nprint_report+0x2b4/0x6ec\nkasan_report+0x118/0x2b0\n__asan_load4+0xb8/0xd0\nkvm_spapr_tce_attach_iommu_group+0x298/0x720 [kvm]\nkvm_vfio_set_attr+0x524/0xac0 [kvm]\nkvm_device_ioctl+0x144/0x240 [kvm]\nsys_ioctl+0x62c/0x1810\nsystem_call_exception+0x190/0x440\nsystem_call_vectored_common+0x15c/0x2ec\n...\nFreed by task 0:\n...\nkfree+0xec/0x3e0\nrelease_spapr_tce_table+0xd4/0x11c [kvm]\nrcu_core+0x568/0x16a0\nhandle_softirqs+0x23c/0x920\ndo_softirq_own_stack+0x6c/0x90\ndo_softirq_own_stack+0x58/0x90\n__irq_exit_rcu+0x218/0x2d0\nirq_exit+0x30/0x80\narch_local_irq_restore+0x128/0x230\narch_local_irq_enable+0x1c/0x30\ncpuidle_enter_state+0x134/0x5cc\ncpuidle_enter+0x6c/0xb0\ncall_cpuidle+0x7c/0x100\ndo_idle+0x394/0x410\ncpu_startup_entry+0x60/0x70\nstart_secondary+0x3fc/0x410\nstart_secondary_prolog+0x10/0x14\nFix it by delaying the fdput() until `stt` is no longer in use, which\nis effectively the entire function. To keep the patch minimal add a call\nto fdput() at each of the existing return paths. Future work can convert\nthe function to goto or __cleanup style cleanup.\nWith the fix in place the test case no longer triggers the UAF."], "name": "CVE-2024-41070", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2024-07-29T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2024-41070\nhttps://nvd.nist.gov/vuln/detail/CVE-2024-41070\nhttps://lore.kernel.org/linux-cve-announce/2024072908-CVE-2024-41070-ad39@gregkh/T"], "threat_severity": "Moderate", "upstream_fix": "kernel 5.4.281, kernel 5.10.223, kernel 5.15.164, kernel 6.1.101, kernel 6.6.42, kernel 6.9.11, kernel 6.10"}