CVE-2026-89954

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-89954", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-09-11T19:38:34.777Z", "datePublished": "2026-09-16T10:32:38.355Z", "dateUpdated": "2026-10-19T08:55:28.240Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-19T08:55:28.240Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmtd: afs: validate v2 image info bounds\n\nThe AFS v2 parser uses footer[8] to locate the image information block\ninside the current erase block, then uses the image information\nregion_count to walk entries from a fixed local array. The footer offset\nand region count come from flash contents and are not checked against the\nerase block or the local image-info array before use.\n\nReject v2 entries whose image information offset would underflow the\nerase block calculation, and reject region counts that cannot fit in the\nlocal image-info array before walking region entries."}], "metrics": [{"cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:H", "baseScore": 8, "baseSeverity": "HIGH"}, "scenarios": [{"lang": "en", "value": "AV:L - The AFS v2 parser runs from parse_mtd_partitions() during local MTD/physmap probe, reading on-flash ARM Firmware Suite footers via mtd_read(); no network protocol, Bluetooth/Wi-Fi path, or USB gadget/host handler invokes this code.\nAC:L - An attacker who controls the flash image can plant valid AFS v2 magic and CRC and set footer[8] and region_count arbitrarily, so the unsigned info-block offset and the region walk run deterministically with no race or layout condition outside attacker control.\nPR:N - parse_afs_partitions() runs automatically at boot/probe on affected ARM/physmap systems with no credential or capability check; crafted AFS metadata can be delivered in firmware/OTA/supply-chain flash contents without a local OS account.\nUI:N - Partition parsing runs as part of MTD driver initialization at boot or bind; no separate victim action such as mounting a filesystem or opening a device node is required.\nS:U - The stack over-read and any resulting oops remain inside the host kernel; this is not a VM escape, IOMMU bypass, or sandbox breakout.\nC:H - Attacker-controlled region_count drives an unbounded read past the on-stack imginfo[36] array, and kstrdup() of a possibly non-NUL-terminated footer name can copy that kernel stack/adjacent memory into a partition name far beyond a small bounded leak.\nI:L - OOB-derived region offset/size and repeated kstrdup() results are stored in the registered mtd_partition object, modifying kernel flash-layout metadata, but the loop does not perform an out-of-bounds write or yield a control-flow hijack primitive.\nA:H - Walking region_count past imginfo[] reaches unmapped stack or vmalloc pages and oopses or panics the kernel; a huge count can also livelock probe and exhaust memory via kstrdup in the loop."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/mtd/parsers/afs.c"], "versions": [{"version": "b7cf5e2830bbb128699d7635ce8404b7f605bc95", "lessThan": "1bec05a68414cf8d0cab6cb42445b8603f32ffc4", "status": "affected", "versionType": "git"}, {"version": "b7cf5e2830bbb128699d7635ce8404b7f605bc95", "lessThan": "3ad8ff12fd44b08af9212ac4883a7e29d2ab7348", "status": "affected", "versionType": "git"}, {"version": "b7cf5e2830bbb128699d7635ce8404b7f605bc95", "lessThan": "875daa3c750814ff2e2dc050239c390048f0bcd0", "status": "affected", "versionType": "git"}, {"version": "b7cf5e2830bbb128699d7635ce8404b7f605bc95", "lessThan": "da740539e8f370767317e24615349b9342a6e773", "status": "affected", "versionType": "git"}, {"version": "b7cf5e2830bbb128699d7635ce8404b7f605bc95", "lessThan": "1edea8900ca3e405c1421d8b5c29f97107874f72", "status": "affected", "versionType": "git"}, {"version": "b7cf5e2830bbb128699d7635ce8404b7f605bc95", "lessThan": "18916f475057cbd2fb8ea6ae86e6b85884ad1d53", "status": "affected", "versionType": "git"}, {"version": "b7cf5e2830bbb128699d7635ce8404b7f605bc95", "lessThan": "d14e6298139f58a87a87d7022e26a7f37f0ddce7", "status": "affected", "versionType": "git"}, {"version": "b7cf5e2830bbb128699d7635ce8404b7f605bc95", "lessThan": "e9290031f736e99ad17c25c00311c92c266843b7", "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/mtd/parsers/afs.c"], "versions": [{"version": "5.2", "status": "affected"}, {"version": "0", "lessThan": "5.2", "status": "unaffected", "versionType": "semver"}, {"version": "5.10.270", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver"}, {"version": "5.15.221", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.1.188", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.157", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.110", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.51", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.2.5", "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": "5.2", "versionEndExcluding": "5.10.270"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.2", "versionEndExcluding": "5.15.221"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.2", "versionEndExcluding": "6.1.188"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.2", "versionEndExcluding": "6.6.157"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.2", "versionEndExcluding": "6.12.110"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.2", "versionEndExcluding": "6.18.51"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.2", "versionEndExcluding": "7.2.5"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.2", "versionEndExcluding": "7.3"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/1bec05a68414cf8d0cab6cb42445b8603f32ffc4"}, {"url": "https://git.kernel.org/stable/c/3ad8ff12fd44b08af9212ac4883a7e29d2ab7348"}, {"url": "https://git.kernel.org/stable/c/875daa3c750814ff2e2dc050239c390048f0bcd0"}, {"url": "https://git.kernel.org/stable/c/da740539e8f370767317e24615349b9342a6e773"}, {"url": "https://git.kernel.org/stable/c/1edea8900ca3e405c1421d8b5c29f97107874f72"}, {"url": "https://git.kernel.org/stable/c/18916f475057cbd2fb8ea6ae86e6b85884ad1d53"}, {"url": "https://git.kernel.org/stable/c/d14e6298139f58a87a87d7022e26a7f37f0ddce7"}, {"url": "https://git.kernel.org/stable/c/e9290031f736e99ad17c25c00311c92c266843b7"}], "title": "mtd: afs: validate v2 image info bounds", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["drivers/mtd/parsers/afs.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "1bec05a68414cf8d0cab6cb42445b8603f32ffc4", "status": "affected", "version": "b7cf5e2830bbb128699d7635ce8404b7f605bc95", "versionType": "git"}, {"lessThan": "3ad8ff12fd44b08af9212ac4883a7e29d2ab7348", "status": "affected", "version": "b7cf5e2830bbb128699d7635ce8404b7f605bc95", "versionType": "git"}, {"lessThan": "875daa3c750814ff2e2dc050239c390048f0bcd0", "status": "affected", "version": "b7cf5e2830bbb128699d7635ce8404b7f605bc95", "versionType": "git"}, {"lessThan": "da740539e8f370767317e24615349b9342a6e773", "status": "affected", "version": "b7cf5e2830bbb128699d7635ce8404b7f605bc95", "versionType": "git"}, {"lessThan": "1edea8900ca3e405c1421d8b5c29f97107874f72", "status": "affected", "version": "b7cf5e2830bbb128699d7635ce8404b7f605bc95", "versionType": "git"}, {"lessThan": "18916f475057cbd2fb8ea6ae86e6b85884ad1d53", "status": "affected", "version": "b7cf5e2830bbb128699d7635ce8404b7f605bc95", "versionType": "git"}, {"lessThan": "d14e6298139f58a87a87d7022e26a7f37f0ddce7", "status": "affected", "version": "b7cf5e2830bbb128699d7635ce8404b7f605bc95", "versionType": "git"}, {"lessThan": "e9290031f736e99ad17c25c00311c92c266843b7", "status": "affected", "version": "b7cf5e2830bbb128699d7635ce8404b7f605bc95", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["drivers/mtd/parsers/afs.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "5.2"}, {"lessThan": "5.2", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "5.10.*", "status": "unaffected", "version": "5.10.270", "versionType": "semver"}, {"lessThanOrEqual": "5.15.*", "status": "unaffected", "version": "5.15.221", "versionType": "semver"}, {"lessThanOrEqual": "6.1.*", "status": "unaffected", "version": "6.1.188", "versionType": "semver"}, {"lessThanOrEqual": "6.6.*", "status": "unaffected", "version": "6.6.157", "versionType": "semver"}, {"lessThanOrEqual": "6.12.*", "status": "unaffected", "version": "6.12.110", "versionType": "semver"}, {"lessThanOrEqual": "6.18.*", "status": "unaffected", "version": "6.18.51", "versionType": "semver"}, {"lessThanOrEqual": "7.2.*", "status": "unaffected", "version": "7.2.5", "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\nmtd: afs: validate v2 image info bounds\n\nThe AFS v2 parser uses footer[8] to locate the image information block\ninside the current erase block, then uses the image information\nregion_count to walk entries from a fixed local array. The footer offset\nand region count come from flash contents and are not checked against the\nerase block or the local image-info array before use.\n\nReject v2 entries whose image information offset would underflow the\nerase block calculation, and reject region counts that cannot fit in the\nlocal image-info array before walking region entries."}], "id": "CVE-2026-89954", "lastModified": "2026-10-19T09:18:41.450", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 8.0, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "LOW", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:H", "version": "3.1"}, "exploitabilityScore": 2.5, "impactScore": 5.5, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}]}, "published": "2026-09-16T11:17:05.667", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/18916f475057cbd2fb8ea6ae86e6b85884ad1d53"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/1bec05a68414cf8d0cab6cb42445b8603f32ffc4"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/1edea8900ca3e405c1421d8b5c29f97107874f72"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/3ad8ff12fd44b08af9212ac4883a7e29d2ab7348"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/875daa3c750814ff2e2dc050239c390048f0bcd0"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/d14e6298139f58a87a87d7022e26a7f37f0ddce7"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/da740539e8f370767317e24615349b9342a6e773"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/e9290031f736e99ad17c25c00311c92c266843b7"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "[b7cf5e2830bbb128699d7635ce8404b7f605bc95,1bec05a68414cf8d0cab6cb42445b8603f32ffc4)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "[b7cf5e2830bbb128699d7635ce8404b7f605bc95,3ad8ff12fd44b08af9212ac4883a7e29d2ab7348)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "[b7cf5e2830bbb128699d7635ce8404b7f605bc95,875daa3c750814ff2e2dc050239c390048f0bcd0)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "[b7cf5e2830bbb128699d7635ce8404b7f605bc95,da740539e8f370767317e24615349b9342a6e773)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "[b7cf5e2830bbb128699d7635ce8404b7f605bc95,1edea8900ca3e405c1421d8b5c29f97107874f72)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "[b7cf5e2830bbb128699d7635ce8404b7f605bc95,18916f475057cbd2fb8ea6ae86e6b85884ad1d53)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "[b7cf5e2830bbb128699d7635ce8404b7f605bc95,d14e6298139f58a87a87d7022e26a7f37f0ddce7)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "[b7cf5e2830bbb128699d7635ce8404b7f605bc95,e9290031f736e99ad17c25c00311c92c266843b7)"}}], "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": "5.2"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[0,5.2)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[5.10.270,5.11.0]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[5.15.221,5.16.0]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.1.188,6.2.0]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.6.157,6.7.0]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.12.110,6.13.0]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.51,6.19.0]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.2.5,7.3.0]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "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": "2026-09-18T05:30:03.953978+00:00", "title": "AFS v2 Parser Bounds-Check Vulnerability in Linux Kernel", "updated": "2026-09-18T08:15:06.137504+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"], "weaknesses": ["CWE-125", "CWE-126"]}