CVE-2024-40956

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The descriptor is freed via\nidxd_desc_complete() and there's a slight chance may cause issue for\nthe list iterator when the descriptor is reused by another thread\nwithout it being deleted from the list."}], "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 vulnerable code is the idxd (Intel DSA/IAA) threaded IRQ handler, reached only by local kernel-mode descriptor submission (dmaengine clients, or iaa_crypto backing zswap/zram); no remote or adjacent-network data path feeds `irq_entry->work_list`.\nAC:L - The attacker drives one side of the race directly \u2014 sustained parallel descriptor submission (and ENQCMDS-busy abort handling on a shared WQ) from other CPUs repeatedly re-allocates and re-links the just-freed descriptor while the IRQ thread is still walking `flist` \u2014 so the window can be hit reliably by volume rather than by luck.\nPR:L - On an IAA/DSA-accelerated system an ordinary unprivileged process reaches this path with no capability check by generating compression/DMA offload traffic (e.g. memory pressure driving zswap through iaa_crypto with interrupt completion); no root or CAP_SYS_ADMIN is needed.\nUI:N - The race is triggered entirely by the attacker's own workload inside the interrupt-completion path; no victim action such as mounting, opening a file, or loading a module is required.\nS:U - The corruption is confined to kernel memory and kernel-managed DMA descriptors within the same security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - Following the stale `->list` pointer causes the handler to prematurely complete descriptors still owned by other contexts, so DMA source/destination buffers and completion records belonging to unrelated kernel consumers (e.g. other tasks' zswap pages) are read and released to the wrong owner, and the reused-descriptor UAF gives an attacker-influenced read primitive.\nI:H - A descriptor can be released twice into the sbitmap so two contexts own the same descriptor and DMA target, letting the device write results into buffers already handed back, and the list-pointer corruption modifies kernel list structures \u2014 a use-after-free of this kind is leveragable for controlled kernel memory modification.\nA:H - Iterating into a foreign list and double-releasing descriptors produces the same list corruption / general protection fault seen in the parent commit's splat (`irq_process_work_list+0xcd`), i.e. a kernel oops or panic in an IRQ thread, and it can be retriggered."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/dma/idxd/irq.c"], "versions": [{"version": "16e19e11228ba660d9e322035635e7dcf160d5c2", "lessThan": "1b08bf5a17c66ab7dbb628df5344da53c8e7ab33", "status": 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no remote or adjacent-network data path feeds `irq_entry->work_list`.\nAC:L - The attacker drives one side of the race directly \u2014 sustained parallel descriptor submission (and ENQCMDS-busy abort handling on a shared WQ) from other CPUs repeatedly re-allocates and re-links the just-freed descriptor while the IRQ thread is still walking `flist` \u2014 so the window can be hit reliably by volume rather than by luck.\nPR:L - On an IAA/DSA-accelerated system an ordinary unprivileged process reaches this path with no capability check by generating compression/DMA offload traffic (e.g. memory pressure driving zswap through iaa_crypto with interrupt completion); no root or CAP_SYS_ADMIN is needed.\nUI:N - The race is triggered entirely by the attacker's own workload inside the interrupt-completion path; no victim action such as mounting, opening a file, or loading a module is required.\nS:U - The corruption is confined to kernel memory and kernel-managed DMA descriptors within the same security authority; 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{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["drivers/dma/idxd/irq.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "1b08bf5a17c66ab7dbb628df5344da53c8e7ab33", "status": "affected", "version": "16e19e11228ba660d9e322035635e7dcf160d5c2", "versionType": "git"}, {"lessThan": "83163667d881100a485b6c2daa30301b7f68d9b5", "status": "affected", "version": "16e19e11228ba660d9e322035635e7dcf160d5c2", "versionType": "git"}, {"lessThan": "faa35db78b058a2ab6e074ee283f69fa398c36a8", "status": "affected", "version": "16e19e11228ba660d9e322035635e7dcf160d5c2", "versionType": "git"}, {"lessThan": "a14968921486793f2a956086895c3793761309dd", "status": "affected", "version": "16e19e11228ba660d9e322035635e7dcf160d5c2", "versionType": "git"}, {"lessThan": "e3215deca4520773cd2b155bed164c12365149a7", "status": "affected", "version": "16e19e11228ba660d9e322035635e7dcf160d5c2", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["drivers/dma/idxd/irq.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "5.11"}, {"lessThan": "5.11", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "5.15.*", "status": "unaffected", "version": "5.15.162", "versionType": "semver"}, {"lessThanOrEqual": "6.1.*", "status": "unaffected", "version": "6.1.96", "versionType": "semver"}, {"lessThanOrEqual": "6.6.*", "status": "unaffected", "version": "6.6.36", "versionType": "semver"}, {"lessThanOrEqual": "6.9.*", "status": "unaffected", "version": "6.9.7", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "6.10", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "10A39ACC-3005-40E8-875C-98A372D1FFD5", "versionEndExcluding": "5.15.162", "versionStartIncluding": "5.11", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "61E887B4-732A-40D2-9983-CC6F281EBFB7", "versionEndExcluding": "6.1.96", "versionStartIncluding": "5.16", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "E1046C95-860A-45B0-B718-2B29F65BFF10", "versionEndExcluding": "6.6.36", "versionStartIncluding": "6.2", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "0A047AF2-94AC-4A3A-B32D-6AB930D8EF1C", "versionEndExcluding": "6.9.7", "versionStartIncluding": "6.7", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.10:rc1:*:*:*:*:*:*", "matchCriteriaId": "2EBB4392-5FA6-4DA9-9772-8F9C750109FA", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.10:rc2:*:*:*:*:*:*", "matchCriteriaId": "331C2F14-12C7-45D5-893D-8C52EE38EA10", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.10:rc3:*:*:*:*:*:*", "matchCriteriaId": "3173713D-909A-4DD3-9DD4-1E171EB057EE", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.10:rc4:*:*:*:*:*:*", "matchCriteriaId": "79F18AFA-40F7-43F0-BA30-7BDB65F918B9", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndmaengine: idxd: Fix possible Use-After-Free in irq_process_work_list\n\nUse list_for_each_entry_safe() to allow iterating through the list and\ndeleting the entry in the iteration process. The descriptor is freed via\nidxd_desc_complete() and there's a slight chance may cause issue for\nthe list iterator when the descriptor is reused by another thread\nwithout it being deleted from the list."}, {"lang": "es", "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: dmaengine: idxd: corrija posible Use-After-Free en irq_process_work_list Use list_for_each_entry_safe() para permitir iterar a trav\u00e9s de la lista y eliminar la entrada en el proceso de iteraci\u00f3n. El descriptor se libera a trav\u00e9s de idxd_desc_complete() y existe una peque\u00f1a posibilidad de que cause problemas para el iterador de la lista cuando otro subproceso reutiliza el descriptor sin que se elimine de la lista."}], "id": "CVE-2024-40956", "lastModified": "2026-08-04T11:19:09.503", "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": 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"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2024-40956", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2024-09-10T17:03:42.094021Z", "version": "2.0.3"}}]}, "published": "2024-07-12T13:15:17.760", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/1b08bf5a17c66ab7dbb628df5344da53c8e7ab33"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/83163667d881100a485b6c2daa30301b7f68d9b5"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/a14968921486793f2a956086895c3793761309dd"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/e3215deca4520773cd2b155bed164c12365149a7"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/faa35db78b058a2ab6e074ee283f69fa398c36a8"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/1b08bf5a17c66ab7dbb628df5344da53c8e7ab33"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/83163667d881100a485b6c2daa30301b7f68d9b5"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/a14968921486793f2a956086895c3793761309dd"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/e3215deca4520773cd2b155bed164c12365149a7"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/faa35db78b058a2ab6e074ee283f69fa398c36a8"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "url": "https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-416"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"affected_release": [{"advisory": "RHSA-2025:6966", "cpe": "cpe:/a:redhat:enterprise_linux:9", "package": "kernel-0:5.14.0-570.12.1.el9_6", "product_name": "Red Hat Enterprise Linux 9", "release_date": "2025-05-13T00:00:00Z"}, {"advisory": "RHSA-2025:6966", "cpe": "cpe:/o:redhat:enterprise_linux:9", "package": "kernel-0:5.14.0-570.12.1.el9_6", "product_name": "Red Hat Enterprise Linux 9", "release_date": "2025-05-13T00:00:00Z"}, {"advisory": "RHSA-2024:6267", "cpe": "cpe:/a:redhat:rhel_eus:9.2", "package": "kernel-0:5.14.0-284.82.1.el9_2", "product_name": "Red Hat Enterprise Linux 9.2 Extended Update Support", "release_date": "2024-09-04T00:00:00Z"}, {"advisory": "RHSA-2024:6268", "cpe": "cpe:/a:redhat:rhel_eus:9.2::nfv", "package": "kernel-rt-0:5.14.0-284.82.1.rt14.367.el9_2", "product_name": "Red Hat Enterprise Linux 9.2 Extended Update Support", "release_date": "2024-09-04T00:00:00Z"}, {"advisory": "RHSA-2024:9546", "cpe": "cpe:/a:redhat:rhel_eus:9.4", "package": "kernel-0:5.14.0-427.44.1.el9_4", "product_name": "Red Hat Enterprise Linux 9.4 Extended Update Support", "release_date": "2024-11-13T00:00:00Z"}], "bugzilla": {"description": "kernel: dmaengine: idxd: Fix possible Use-After-Free in irq_process_work_list", "id": "2297540", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2297540"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.8", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "status": "verified"}, "cwe": "CWE-416", "details": ["In the Linux kernel, the following vulnerability has been resolved:\ndmaengine: idxd: Fix possible Use-After-Free in irq_process_work_list\nUse list_for_each_entry_safe() to allow iterating through the list and\ndeleting the entry in the iteration process. The descriptor is freed via\nidxd_desc_complete() and there's a slight chance may cause issue for\nthe list iterator when the descriptor is reused by another thread\nwithout it being deleted from the list.", "A vulnerability was found in the Linux kernel's DMA engine component in the irq_process_work_list() function. A possible use-after-free condition can occur during list iteration, which is because a descriptor may be freed while another thread is reusing it, potentially leading to access to freed memory."], "mitigation": {"lang": "en:us", "value": "Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability."}, "name": "CVE-2024-40956", "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": "Will not fix", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Will not fix", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2024-07-12T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2024-40956\nhttps://nvd.nist.gov/vuln/detail/CVE-2024-40956\nhttps://lore.kernel.org/linux-cve-announce/2024071224-CVE-2024-40956-b65d@gregkh/T"], "statement": "This vulnerability is rated as a Moderate severity because, although it allows use-after-free during list processing with a low attack complexity and local access, exploitation remains limited to localized impact. The risk of descriptor reuse could affect stability but does not broadly compromise system security.", "threat_severity": "Moderate"}

{}