CVE-2022-48762

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2022-48762", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2024-06-20T11:09:39.060Z", "datePublished": "2024-06-20T11:13:39.855Z", "dateUpdated": "2026-08-05T08:52:11.000Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T08:52:11.000Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\narm64: extable: fix load_unaligned_zeropad() reg indices\n\nIn ex_handler_load_unaligned_zeropad() we erroneously extract the data and\naddr register indices from ex->type rather than ex->data. As ex->type will\ncontain EX_TYPE_LOAD_UNALIGNED_ZEROPAD (i.e. 4):\n * We'll always treat X0 as the address register, since EX_DATA_REG_ADDR is\n extracted from bits [9:5]. Thus, we may attempt to dereference an\n arbitrary address as X0 may hold an arbitrary value.\n * We'll always treat X4 as the data register, since EX_DATA_REG_DATA is\n extracted from bits [4:0]. Thus we will corrupt X4 and cause arbitrary\n behaviour within load_unaligned_zeropad() and its caller.\n\nFix this by extracting both values from ex->data as originally intended.\n\nOn an MTE-enabled QEMU image we are hitting the following crash:\n Unable to handle kernel NULL pointer dereference at virtual address 0000000000000000\n Call trace:\n fixup_exception+0xc4/0x108\n __do_kernel_fault+0x3c/0x268\n do_tag_check_fault+0x3c/0x104\n do_mem_abort+0x44/0xf4\n el1_abort+0x40/0x64\n el1h_64_sync_handler+0x60/0xa0\n el1h_64_sync+0x7c/0x80\n link_path_walk+0x150/0x344\n path_openat+0xa0/0x7dc\n do_filp_open+0xb8/0x168\n do_sys_openat2+0x88/0x17c\n __arm64_sys_openat+0x74/0xa0\n invoke_syscall+0x48/0x148\n el0_svc_common+0xb8/0xf8\n do_el0_svc+0x28/0x88\n el0_svc+0x24/0x84\n el0t_64_sync_handler+0x88/0xec\n el0t_64_sync+0x1b4/0x1b8\n Code: f8695a69 71007d1f 540000e0 927df12a (f940014a)"}], "metrics": [{"cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "baseScore": 7.8, "baseSeverity": "HIGH"}, "scenarios": [{"lang": "en", "value": "AV:L - The bug is in the arm64 exception fixup for load_unaligned_zeropad(), reached when pathname hashing faults during local syscalls such as openat\u2192link_path_walk\u2192hash_name; it is not a network-protocol entry point.\nAC:L - On the worst reasonable deployment (MTE-enabled arm64, e.g. Android), an unprivileged attacker can craft a pathname so word-at-a-time hashing crosses a tag/allocation boundary and reliably invokes the broken fixup, with no attacker-uncontrollable race.\nPR:L - Triggering requires only an unprivileged local account able to call open/stat-style path lookups; no capabilities or init-namespace root are needed.\nUI:N - The attacker invokes the vulnerable path themselves via ordinary filesystem syscalls; no separate victim action is required.\nS:U - Impact is confined to the host kernel\u2019s own privilege domain (oops or corrupted kernel register state during path walk); this is not a VM/IOMMU/sandbox boundary escape.\nC:H - The broken handler always dereferences X0 and loads an unsigned long from that address, so a non-NULL X0 yields an unintended kernel memory read; combined with X4 clobber this is a memory-safety read primitive scored as C:H.\nI:H - The handler always writes the loaded value into X4, and the fix commit explicitly notes this corrupts X4 and causes arbitrary behaviour in load_unaligned_zeropad() and its caller, which can turn corrupted pointer/state into integrity compromise.\nA:H - When X0 is NULL (common after may_lookup in link_path_walk), the fixup\u2019s own load is a NULL deref that nests into die_kernel_fault, producing a documented kernel oops/panic."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["arch/arm64/mm/extable.c"], "versions": [{"version": "753b32368705c396000f95f33c3b7018474e33ad", "lessThan": "47fe7a1c5e3e011eeb4ab79f2d54a794fdd1c3eb", "status": "affected", "versionType": "git"}, {"version": "753b32368705c396000f95f33c3b7018474e33ad", "lessThan": "3758a6c74e08bdc15ccccd6872a6ad37d165239a", "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/arm64/mm/extable.c"], "versions": [{"version": "5.16", "status": "affected"}, {"version": "0", "lessThan": "5.16", "status": "unaffected", "versionType": "semver"}, {"version": "5.16.5", "lessThanOrEqual": "5.16.*", "status": "unaffected", "versionType": "semver"}, {"version": "5.17", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix"}]}], "cpeApplicability": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.16", "versionEndExcluding": "5.16.5"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.16", "versionEndExcluding": "5.17"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/47fe7a1c5e3e011eeb4ab79f2d54a794fdd1c3eb"}, {"url": "https://git.kernel.org/stable/c/3758a6c74e08bdc15ccccd6872a6ad37d165239a"}], "title": "arm64: extable: fix load_unaligned_zeropad() reg indices", "x_generator": {"engine": "bippy-1.2.0"}}, "adp": [{"problemTypes": [{"descriptions": [{"type": "CWE", "lang": "en", "description": "CWE-noinfo Not enough information"}]}], "metrics": [{"cvssV3_1": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 6.2, "attackVector": "LOCAL", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "integrityImpact": "NONE", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "NONE", "confidentialityImpact": "NONE"}}, {"other": {"type": "ssvc", "content": {"timestamp": "2024-06-20T13:32:18.518076Z", "id": "CVE-2022-48762", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "role": "CISA Coordinator", "version": "2.0.3"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2024-10-29T18:16:31.076Z"}}, {"providerMetadata": {"orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2024-08-03T15:25:01.535Z"}, "title": "CVE Program Container", "references": [{"url": "https://git.kernel.org/stable/c/47fe7a1c5e3e011eeb4ab79f2d54a794fdd1c3eb", "tags": ["x_transferred"]}, {"url": "https://git.kernel.org/stable/c/3758a6c74e08bdc15ccccd6872a6ad37d165239a", "tags": ["x_transferred"]}]}]}}

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As ex->type will\ncontain EX_TYPE_LOAD_UNALIGNED_ZEROPAD (i.e. 4):\n * We'll always treat X0 as the address register, since EX_DATA_REG_ADDR is\n extracted from bits [9:5]. Thus, we may attempt to dereference an\n arbitrary address as X0 may hold an arbitrary value.\n * We'll always treat X4 as the data register, since EX_DATA_REG_DATA is\n extracted from bits [4:0]. Thus we will corrupt X4 and cause arbitrary\n behaviour within load_unaligned_zeropad() and its caller.\n\nFix this by extracting both values from ex->data as originally intended.\n\nOn an MTE-enabled QEMU image we are hitting the following crash:\n Unable to handle kernel NULL pointer dereference at virtual address 0000000000000000\n Call trace:\n fixup_exception+0xc4/0x108\n __do_kernel_fault+0x3c/0x268\n do_tag_check_fault+0x3c/0x104\n do_mem_abort+0x44/0xf4\n el1_abort+0x40/0x64\n el1h_64_sync_handler+0x60/0xa0\n el1h_64_sync+0x7c/0x80\n link_path_walk+0x150/0x344\n path_openat+0xa0/0x7dc\n do_filp_open+0xb8/0x168\n do_sys_openat2+0x88/0x17c\n __arm64_sys_openat+0x74/0xa0\n invoke_syscall+0x48/0x148\n el0_svc_common+0xb8/0xf8\n do_el0_svc+0x28/0x88\n el0_svc+0x24/0x84\n el0t_64_sync_handler+0x88/0xec\n el0t_64_sync+0x1b4/0x1b8\n Code: f8695a69 71007d1f 540000e0 927df12a (f940014a)"}], "cpeApplicability": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.16.5", "versionStartIncluding": "5.16"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.17", "versionStartIncluding": "5.16"}], "operator": "OR"}]}], "providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T08:52:11.000Z"}}}, "cveMetadata": {"cveId": "CVE-2022-48762", "state": "PUBLISHED", "dateUpdated": "2026-08-05T08:52:11.000Z", "dateReserved": "2024-06-20T11:09:39.060Z", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "datePublished": "2024-06-20T11:13:39.855Z", "assignerShortName": "Linux"}, "dataVersion": "5.2"}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["arch/arm64/mm/extable.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "47fe7a1c5e3e011eeb4ab79f2d54a794fdd1c3eb", "status": "affected", "version": "753b32368705c396000f95f33c3b7018474e33ad", "versionType": "git"}, {"lessThan": "3758a6c74e08bdc15ccccd6872a6ad37d165239a", "status": "affected", "version": "753b32368705c396000f95f33c3b7018474e33ad", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["arch/arm64/mm/extable.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "5.16"}, {"lessThan": "5.16", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "5.16.*", "status": "unaffected", "version": "5.16.5", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "5.17", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "1AD9E77E-B27E-450C-8FD8-B64EC5FB002D", "versionEndExcluding": "5.16.5", "versionStartIncluding": "5.16", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:5.17:rc1:*:*:*:*:*:*", "matchCriteriaId": "7BD5F8D9-54FA-4CB0-B4F0-CB0471FDDB2D", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\narm64: extable: fix load_unaligned_zeropad() reg indices\n\nIn ex_handler_load_unaligned_zeropad() we erroneously extract the data and\naddr register indices from ex->type rather than ex->data. As ex->type will\ncontain EX_TYPE_LOAD_UNALIGNED_ZEROPAD (i.e. 4):\n * We'll always treat X0 as the address register, since EX_DATA_REG_ADDR is\n extracted from bits [9:5]. Thus, we may attempt to dereference an\n arbitrary address as X0 may hold an arbitrary value.\n * We'll always treat X4 as the data register, since EX_DATA_REG_DATA is\n extracted from bits [4:0]. Thus we will corrupt X4 and cause arbitrary\n behaviour within load_unaligned_zeropad() and its caller.\n\nFix this by extracting both values from ex->data as originally intended.\n\nOn an MTE-enabled QEMU image we are hitting the following crash:\n Unable to handle kernel NULL pointer dereference at virtual address 0000000000000000\n Call trace:\n fixup_exception+0xc4/0x108\n __do_kernel_fault+0x3c/0x268\n do_tag_check_fault+0x3c/0x104\n do_mem_abort+0x44/0xf4\n el1_abort+0x40/0x64\n el1h_64_sync_handler+0x60/0xa0\n el1h_64_sync+0x7c/0x80\n link_path_walk+0x150/0x344\n path_openat+0xa0/0x7dc\n do_filp_open+0xb8/0x168\n do_sys_openat2+0x88/0x17c\n __arm64_sys_openat+0x74/0xa0\n invoke_syscall+0x48/0x148\n el0_svc_common+0xb8/0xf8\n do_el0_svc+0x28/0x88\n el0_svc+0x24/0x84\n el0t_64_sync_handler+0x88/0xec\n el0t_64_sync+0x1b4/0x1b8\n Code: f8695a69 71007d1f 540000e0 927df12a (f940014a)"}, {"lang": "es", "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: arm64: extable: corrige los \u00edndices de registro load_unaligned_zeropad() En ex_handler_load_unaligned_zeropad() extraemos err\u00f3neamente los datos y los \u00edndices de registro de direcciones de ex->type en lugar de ex->data. Como ex->type contendr\u00e1 EX_TYPE_LOAD_UNALIGNED_ZEROPAD (es decir, 4): * Siempre trataremos a X0 como el registro de direcci\u00f3n, ya que EX_DATA_REG_ADDR se extrae de los bits [9:5]. Por lo tanto, podemos intentar eliminar la referencia a una direcci\u00f3n arbitraria ya que X0 puede tener un valor arbitrario. * Siempre trataremos a X4 como el registro de datos, ya que EX_DATA_REG_DATA se extrae de los bits [4:0]. Por lo tanto, corromperemos X4 y provocaremos un comportamiento arbitrario dentro de load_unaligned_zeropad() y su llamador. Solucione este problema extrayendo ambos valores de ex->data como se pretend\u00eda originalmente. En una imagen QEMU habilitada para MTE, nos encontramos con el siguiente bloqueo: No se puede manejar la desreferencia del puntero NULL del kernel en la direcci\u00f3n virtual 0000000000000000 Rastreo de llamadas: fixup_exception+0xc4/0x108 __do_kernel_fault+0x3c/0x268 do_tag_check_fault+0x3c/0x104 do_mem_abort+0x44/0 xf4 el1_abort+ 0x40/0x64 el1h_64_sync_handler+0x60/0xa0 el1h_64_sync+0x7c/0x80 link_path_walk+0x150/0x344 path_openat+0xa0/0x7dc do_filp_open+0xb8/0x168 do_sys_openat2+0x88/0x17c __arm64_s ys_openat+0x74/0xa0 invoke_syscall+0x48/0x148 el0_svc_common+0xb8/0xf8 do_el0_svc+ 0x28/0x88 el0_svc+0x24/0x84 el0t_64_sync_handler+0x88/0xec el0t_64_sync+0x1b4/0x1b8 C\u00f3digo: f8695a69 71007d1f 540000e0 927df12a (f940014a)"}], "id": "CVE-2022-48762", "lastModified": "2026-08-04T10:17:19.960", "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": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}, {"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 6.2, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 2.5, "impactScore": 3.6, "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2022-48762", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2024-06-20T13:32:18.518076Z", "version": "2.0.3"}}]}, "published": "2024-06-20T12:15:14.287", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/3758a6c74e08bdc15ccccd6872a6ad37d165239a"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/47fe7a1c5e3e011eeb4ab79f2d54a794fdd1c3eb"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/3758a6c74e08bdc15ccccd6872a6ad37d165239a"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/47fe7a1c5e3e011eeb4ab79f2d54a794fdd1c3eb"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-476"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: arm64: extable: fix load_unaligned_zeropad() reg indices", "id": "2293373", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2293373"}, "csaw": false, "cvss3": {"cvss3_base_score": "4.1", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-476", "details": ["In the Linux kernel, the following vulnerability has been resolved:\narm64: extable: fix load_unaligned_zeropad() reg indices\nIn ex_handler_load_unaligned_zeropad() we erroneously extract the data and\naddr register indices from ex->type rather than ex->data. As ex->type will\ncontain EX_TYPE_LOAD_UNALIGNED_ZEROPAD (i.e. 4):\n* We'll always treat X0 as the address register, since EX_DATA_REG_ADDR is\nextracted from bits [9:5]. Thus, we may attempt to dereference an\narbitrary address as X0 may hold an arbitrary value.\n* We'll always treat X4 as the data register, since EX_DATA_REG_DATA is\nextracted from bits [4:0]. Thus we will corrupt X4 and cause arbitrary\nbehaviour within load_unaligned_zeropad() and its caller.\nFix this by extracting both values from ex->data as originally intended.\nOn an MTE-enabled QEMU image we are hitting the following crash:\nUnable to handle kernel NULL pointer dereference at virtual address 0000000000000000\nCall trace:\nfixup_exception+0xc4/0x108\n__do_kernel_fault+0x3c/0x268\ndo_tag_check_fault+0x3c/0x104\ndo_mem_abort+0x44/0xf4\nel1_abort+0x40/0x64\nel1h_64_sync_handler+0x60/0xa0\nel1h_64_sync+0x7c/0x80\nlink_path_walk+0x150/0x344\npath_openat+0xa0/0x7dc\ndo_filp_open+0xb8/0x168\ndo_sys_openat2+0x88/0x17c\n__arm64_sys_openat+0x74/0xa0\ninvoke_syscall+0x48/0x148\nel0_svc_common+0xb8/0xf8\ndo_el0_svc+0x28/0x88\nel0_svc+0x24/0x84\nel0t_64_sync_handler+0x88/0xec\nel0t_64_sync+0x1b4/0x1b8\nCode: f8695a69 71007d1f 540000e0 927df12a (f940014a)"], "name": "CVE-2022-48762", "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": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Out of support scope", "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": "2024-06-20T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2022-48762\nhttps://nvd.nist.gov/vuln/detail/CVE-2022-48762\nhttps://lore.kernel.org/linux-cve-announce/2024062009-CVE-2022-48762-9a17@gregkh/T"], "threat_severity": "Low"}

{}