CVE-2026-80956

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-80956", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-08-26T14:34:25.804Z", "datePublished": "2026-09-11T19:42:24.541Z", "dateUpdated": "2026-10-19T08:45:40.093Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-19T08:45:40.093Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndm-pcache: only hand out initialized cache segments\n\nget_cache_segment() scans the segment map up to cache->n_segs, the\nphysical device segment count, but cache_segs_init() only initializes\nthe first cache_info->n_segs segments. A crafted image with\ncache_info->n_segs smaller than the device count leaves the remaining\npcache_cache_segment structs zeroed (segment.data == NULL), and the\nallocator can hand one to cache_kset_close(), which writes through the\nreturned segment's data pointer with no NULL check.\n\nBound the allocator's search to cache_info->n_segs so only initialized\nsegments are ever returned. A conforming cache sets n_segs equal to the\ndevice segment count, so this rejects nothing legitimate."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/md/dm-pcache/cache_segment.c"], "versions": [{"version": "1d57628ff95b32d5cfa8d8f50e07690c161e9cf0", "lessThan": "83e3116283ed2c6a6a1fa662862a4b4d7d2701a2", "status": "affected", "versionType": "git"}, {"version": "1d57628ff95b32d5cfa8d8f50e07690c161e9cf0", "lessThan": "692037ae1a7cfacc2f0c22c6e034c1dfee0e553f", "status": "affected", "versionType": "git"}, {"version": "1d57628ff95b32d5cfa8d8f50e07690c161e9cf0", "lessThan": "2df0fc042e299bae3c0f60ea5cd2af9285658e9f", "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/md/dm-pcache/cache_segment.c"], "versions": [{"version": "6.18", "status": "affected"}, {"version": "0", "lessThan": "6.18", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.50", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.2.4", "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": "6.18", "versionEndExcluding": "6.18.50"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.18", "versionEndExcluding": "7.2.4"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.18", "versionEndExcluding": "7.3"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/83e3116283ed2c6a6a1fa662862a4b4d7d2701a2"}, {"url": "https://git.kernel.org/stable/c/692037ae1a7cfacc2f0c22c6e034c1dfee0e553f"}, {"url": "https://git.kernel.org/stable/c/2df0fc042e299bae3c0f60ea5cd2af9285658e9f"}], "title": "dm-pcache: only hand out initialized cache segments", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["drivers/md/dm-pcache/cache_segment.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "83e3116283ed2c6a6a1fa662862a4b4d7d2701a2", "status": "affected", "version": "1d57628ff95b32d5cfa8d8f50e07690c161e9cf0", "versionType": "git"}, {"lessThan": "692037ae1a7cfacc2f0c22c6e034c1dfee0e553f", "status": "affected", "version": "1d57628ff95b32d5cfa8d8f50e07690c161e9cf0", "versionType": "git"}, {"lessThan": "2df0fc042e299bae3c0f60ea5cd2af9285658e9f", "status": "affected", "version": "1d57628ff95b32d5cfa8d8f50e07690c161e9cf0", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["drivers/md/dm-pcache/cache_segment.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "6.18"}, {"lessThan": "6.18", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "6.18.*", "status": "unaffected", "version": "6.18.50", "versionType": "semver"}, {"lessThanOrEqual": "7.2.*", "status": "unaffected", "version": "7.2.4", "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\ndm-pcache: only hand out initialized cache segments\n\nget_cache_segment() scans the segment map up to cache->n_segs, the\nphysical device segment count, but cache_segs_init() only initializes\nthe first cache_info->n_segs segments. A crafted image with\ncache_info->n_segs smaller than the device count leaves the remaining\npcache_cache_segment structs zeroed (segment.data == NULL), and the\nallocator can hand one to cache_kset_close(), which writes through the\nreturned segment's data pointer with no NULL check.\n\nBound the allocator's search to cache_info->n_segs so only initialized\nsegments are ever returned. A conforming cache sets n_segs equal to the\ndevice segment count, so this rejects nothing legitimate."}], "id": "CVE-2026-80956", "lastModified": "2026-10-19T09:17:27.067", "metrics": {}, "published": "2026-09-11T20:19:01.410", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/2df0fc042e299bae3c0f60ea5cd2af9285658e9f"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/692037ae1a7cfacc2f0c22c6e034c1dfee0e553f"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/83e3116283ed2c6a6a1fa662862a4b4d7d2701a2"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{"bugzilla": {"description": "kernel: Linux kernel: dm-pcache NULL pointer dereference leads to denial of service", "id": "2532400", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2532400"}, "csaw": false, "cvss3": {"cvss3_base_score": "4.4", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-824", "details": ["A flaw was found in the Linux kernel's `dm-pcache` component. A crafted image can cause the `get_cache_segment()` function to return an uninitialized cache segment. This uninitialized segment, containing a null data pointer, is then used by `cache_kset_close()` without a proper null check. This can lead to a system crash, resulting in a Denial of Service (DoS)."], "name": "CVE-2026-80956", "public_date": "2026-09-11T19:42:24Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-80956\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-80956\nhttps://git.kernel.org/stable/c/2df0fc042e299bae3c0f60ea5cd2af9285658e9f\nhttps://git.kernel.org/stable/c/692037ae1a7cfacc2f0c22c6e034c1dfee0e553f\nhttps://git.kernel.org/stable/c/83e3116283ed2c6a6a1fa662862a4b4d7d2701a2"], "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[1d57628ff95b32d5cfa8d8f50e07690c161e9cf0,83e3116283ed2c6a6a1fa662862a4b4d7d2701a2)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[1d57628ff95b32d5cfa8d8f50e07690c161e9cf0,692037ae1a7cfacc2f0c22c6e034c1dfee0e553f)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[1d57628ff95b32d5cfa8d8f50e07690c161e9cf0,2df0fc042e299bae3c0f60ea5cd2af9285658e9f)"}}], "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": "6.18"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,6.18)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.50,6.19.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.2.4,7.3.0)"}}, {"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": "2026-09-13T17:15:06.230988+00:00", "updated": "2026-09-21T03:15:09.535649+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}