CVE-2026-90069

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-90069", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-09-11T19:38:34.784Z", "datePublished": "2026-09-17T16:05:50.894Z", "dateUpdated": "2026-10-19T08:57:26.441Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-19T08:57:26.441Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ncrypto: acomp - allocate async request context when cloning\n\nACOMP_REQUEST_ON_STACK() reserves only enough storage for the\nsynchronous fallback. When an async implementation is selected, callers\nclone that stack request before retrying, but acomp_request_clone()\ncurrently copies only the stack-sized object. The clone therefore has no\nstorage for the async provider request context, and providers such as QAT\nwrite past the allocation through acomp_request_ctx(). KASAN does report\na slab OOB write.\n\nAllocate a zeroed clone large enough for the runtime acomp request size,\ncopy only the bytes present in the source object, and preserve the\nexisting fallback-on-allocation-failure behavior. Use the runtime reqsize\nbecause an implementation may adjust it during tfm initialization."}], "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 undersized clone is produced only by ACOMP_REQUEST_CLONE in ubifs_compress_common()/ubifs_decompress_common(), reached from local VFS writeback (write/fsync \u2192 ubifs_writepage \u2192 do_writepage \u2192 ubifs_jnl_write_data \u2192 ubifs_compress_folio) or read (ubifs_read_folio \u2192 read_block \u2192 ubifs_decompress_folio). IPComp uses acomp_request_alloc_extra() and never clones, so no protocol message carries this bug.\nAC:L - When UBIFS's compressor tfm is async, crypto_acomp_compress()/crypto_acomp_decompress() return -EAGAIN for every ACOMP_REQUEST_ON_STACK request, and the following ACOMP_REQUEST_CLONE plus QAT qat_comp_alg_compress_decompress() write through acomp_request_ctx() always overflows the kmemdup; there is no race or uninfluenced layout to win.\nPR:L - An unprivileged user with write permission on a UBIFS inode that inherited UBIFS_COMPR_FL triggers the clone by writing \u2265 UBIFS_MIN_COMPR_LEN bytes and fsync(); ubifs_fs_type has no FS_USERNS_MOUNT, but an already-mounted volume needs no capability beyond ordinary file write access.\nUI:N - The attacker creates and writes their own file on the mounted UBIFS volume and forces writeback with fsync() into ubifs_jnl_write_data(); no other user must mount an image or open a file.\nS:U - qat_comp_alg_compress_decompress() writes struct qat_compression_req through acomp_request_ctx() into kernel slab adjacent to the clone; the corruption stays in kernel memory and does not cross a VM, IOMMU, or guest/host boundary.\nC:H - The entire qat_compression_req (firmware request, DMA buffer pointers, qat_compression_ctx * and acomp_req *) is stored past the kmemdup of sizeof(struct acomp_req), so qat_comp_generic_callback() later reads those fields from neighboring slab objects, giving an arbitrary kernel read after heap grooming.\nI:H - qat_comp_alg_compress_decompress() performs a slab out-of-bounds write of sizeof(struct qat_compression_req) via acomp_request_ctx() on the clone, overwriting adjacent heap objects including function pointers and providing a control-flow hijack and arbitrary-write primitive.\nA:H - KASAN reports a slab out-of-bounds write through acomp_request_ctx() on the undersized clone, and overflowing qat_compression_req into the next slab object oopses or panics on the QAT callback or allocator integrity check."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["crypto/acompress.c"], "versions": [{"version": "097c432caaa6d91f87732fe991cb08139e31101a", "lessThan": "d48197cbd5d3476c7deea644972e9ec510865ec2", "status": "affected", "versionType": "git"}, {"version": "097c432caaa6d91f87732fe991cb08139e31101a", "lessThan": "889fa17a0af09ff93a9166abc82ee7a654faa49b", "status": "affected", "versionType": "git"}, {"version": "097c432caaa6d91f87732fe991cb08139e31101a", "lessThan": "ee440d4fc0d2f15894ab1f64c474a3adbc858880", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["crypto/acompress.c"], "versions": [{"version": "6.16", "status": "affected"}, {"version": "0", "lessThan": "6.16", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.52", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.2.6", "lessThanOrEqual": "7.2.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.3", "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": "6.16", "versionEndExcluding": "6.18.52"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.16", "versionEndExcluding": "7.2.6"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.16", "versionEndExcluding": "7.3"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/d48197cbd5d3476c7deea644972e9ec510865ec2"}, {"url": "https://git.kernel.org/stable/c/889fa17a0af09ff93a9166abc82ee7a654faa49b"}, {"url": "https://git.kernel.org/stable/c/ee440d4fc0d2f15894ab1f64c474a3adbc858880"}], "title": "crypto: acomp - allocate async request context when cloning", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["crypto/acompress.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "d48197cbd5d3476c7deea644972e9ec510865ec2", "status": "affected", "version": "097c432caaa6d91f87732fe991cb08139e31101a", "versionType": "git"}, {"lessThan": "889fa17a0af09ff93a9166abc82ee7a654faa49b", "status": "affected", "version": "097c432caaa6d91f87732fe991cb08139e31101a", "versionType": "git"}, {"lessThan": "ee440d4fc0d2f15894ab1f64c474a3adbc858880", "status": "affected", "version": "097c432caaa6d91f87732fe991cb08139e31101a", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["crypto/acompress.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "6.16"}, {"lessThan": "6.16", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "6.18.*", "status": "unaffected", "version": "6.18.52", "versionType": "semver"}, {"lessThanOrEqual": "7.2.*", "status": "unaffected", "version": "7.2.6", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "7.3", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ncrypto: acomp - allocate async request context when cloning\n\nACOMP_REQUEST_ON_STACK() reserves only enough storage for the\nsynchronous fallback. When an async implementation is selected, callers\nclone that stack request before retrying, but acomp_request_clone()\ncurrently copies only the stack-sized object. The clone therefore has no\nstorage for the async provider request context, and providers such as QAT\nwrite past the allocation through acomp_request_ctx(). KASAN does report\na slab OOB write.\n\nAllocate a zeroed clone large enough for the runtime acomp request size,\ncopy only the bytes present in the source object, and preserve the\nexisting fallback-on-allocation-failure behavior. Use the runtime reqsize\nbecause an implementation may adjust it during tfm initialization."}], "id": "CVE-2026-90069", "lastModified": "2026-10-19T09:18:55.470", "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"}]}, "published": "2026-09-17T17:16:55.830", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/889fa17a0af09ff93a9166abc82ee7a654faa49b"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/d48197cbd5d3476c7deea644972e9ec510865ec2"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/ee440d4fc0d2f15894ab1f64c474a3adbc858880"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[097c432caaa6d91f87732fe991cb08139e31101a,d48197cbd5d3476c7deea644972e9ec510865ec2)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[097c432caaa6d91f87732fe991cb08139e31101a,889fa17a0af09ff93a9166abc82ee7a654faa49b)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[097c432caaa6d91f87732fe991cb08139e31101a,ee440d4fc0d2f15894ab1f64c474a3adbc858880)"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "6.16"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,6.16)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.52,6.19.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.2.6,7.3.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.3-rc1,*]"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}], "created": "2026-09-18T15:00:10.275981+00:00", "updated": "2026-09-20T04:30:18.060726+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"], "weaknesses": ["CWE-120", "CWE-122"]}