{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-31436", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-03-09T15:48:24.089Z", "datePublished": "2026-04-22T13:53:35.693Z", "dateUpdated": "2026-08-05T12:22:33.386Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T12:22:33.386Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndmaengine: idxd: fix possible wrong descriptor completion in llist_abort_desc()\n\nAt the end of this function, d is the traversal cursor of flist, but the\ncode completes found instead. This can lead to issues such as NULL pointer\ndereferences, double completion, or descriptor leaks.\n\nFix this by completing d instead of found in the final\nlist_for_each_entry_safe() loop." } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "baseScore": 9.8, "baseSeverity": "CRITICAL" }, "scenarios": [ { "lang": "en", "value": "AV:N - In a reasonable network-facing deployment, XFRM/IPComp packets can reach `ipcomp_input()` and `crypto_acomp_decompress()`, which can use the IAA `deflate` acomp implementation and submit idxd descriptors. This makes the vulnerable idxd completion-abort path reachable from network traffic.\nAC:L - The vulnerable path requires an interrupt-completion shared workqueue and an `ENQCMDS` failure, but under that deployment the attacker can drive concurrent compression/decompression requests to create WQ pressure. No uncontrollable race or precise timing is required beyond triggering descriptor submission failure under load.\nPR:N - For the network IPComp path, the attacker only needs to send packets to an already configured endpoint and does not need a local account or kernel capability. Administrative setup of the transform/workqueue is treated as deployment configuration, not attacker privilege.\nUI:N - No victim interaction is needed once the vulnerable network-facing configuration is active. Packets or repeated requests can trigger the descriptor submission and abort path directly.\nS:U - The bug corrupts or crashes kernel-owned idxd/dmaengine state within the same kernel security authority. It does not by itself demonstrate a VM escape, IOMMU bypass, or cross-scope boundary violation.\nC:H - Completing the wrong descriptor can cause double completion and premature descriptor reuse, creating UAF/type-confusion-like corruption of kernel request and callback state. Following the high-severity rule for such memory corruption, kernel memory disclosure is defensible.\nI:H - Wrong descriptor completion can recycle an in-flight descriptor and later complete or reuse it for another request, corrupting DMA/crypto request state and potentially enabling control-flow or data corruption. When uncertain, this is scored as high integrity impact.\nA:H - The fix commit explicitly identifies possible NULL pointer dereferences, double completion, and descriptor leaks. These can crash or hang kernel workqueue processing, giving high availability impact." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/dma/idxd/submit.c" ], "versions": [ { "version": "aa8d18becc0c14aa3eb46d6d1b81450446e11b87", "lessThan": "e21da2ad8844585040fe4b82be1ad2fe99d40074", "status": "affected", "versionType": "git" }, { "version": "aa8d18becc0c14aa3eb46d6d1b81450446e11b87", "lessThan": "82656e8daf8de00935ae91b91bed43f4d6e0d644", "status": "affected", "versionType": "git" }, { "version": "aa8d18becc0c14aa3eb46d6d1b81450446e11b87", "lessThan": "0e4f43779d550e559be13a5cdb763bad92c4cc99", "status": "affected", "versionType": "git" }, { "version": "aa8d18becc0c14aa3eb46d6d1b81450446e11b87", "lessThan": "e1c9866173c5f8521f2d0768547a01508cb9ff27", "status": "affected", "versionType": "git" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/dma/idxd/submit.c" ], "versions": [ { "version": "6.8", "status": "affected" }, { "version": "0", "lessThan": "6.8", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.80", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.21", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.19.11", "lessThanOrEqual": "6.19.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.0", "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": "6.8", "versionEndExcluding": "6.12.80" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.8", "versionEndExcluding": "6.18.21" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.8", "versionEndExcluding": "6.19.11" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.8", "versionEndExcluding": "7.0" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/e21da2ad8844585040fe4b82be1ad2fe99d40074" }, { "url": "https://git.kernel.org/stable/c/82656e8daf8de00935ae91b91bed43f4d6e0d644" }, { "url": "https://git.kernel.org/stable/c/0e4f43779d550e559be13a5cdb763bad92c4cc99" }, { "url": "https://git.kernel.org/stable/c/e1c9866173c5f8521f2d0768547a01508cb9ff27" } ], "title": "dmaengine: idxd: fix possible wrong descriptor completion in llist_abort_desc()", "x_generator": { "engine": "bippy-1.2.0" } } } }