{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2024-43845", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2024-08-17T09:11:59.275Z", "datePublished": "2024-08-17T09:21:59.735Z", "dateUpdated": "2026-08-05T11:36:43.794Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T11:36:43.794Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nudf: Fix bogus checksum computation in udf_rename()\n\nSyzbot reports uninitialized memory access in udf_rename() when updating\nchecksum of '..' directory entry of a moved directory. This is indeed\ntrue as we pass on-stack diriter.fi to the udf_update_tag() and because\nthat has only struct fileIdentDesc included in it and not the impUse or\nname fields, the checksumming function is going to checksum random stack\ncontents beyond the end of the structure. This is actually harmless\nbecause the following udf_fiiter_write_fi() will recompute the checksum\nfrom on-disk buffers where everything is properly included. So all that\nis needed is just removing the bogus calculation." } ], "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 - Triggering requires a crafted UDF image to be mounted and a local `renameat2()`/`mv` of a directory to a different parent directory; there is no remote or network-facing path into `udf_rename()`. Loop-mounting a crafted image via udisks2 removes any need for physical media access, so Local rather than Physical.\nAC:L - The attacker fully controls the `lengthOfImpUse` field of the `..` file identifier descriptor in their own image and the rename operation itself; the out-of-bounds read length and trigger are deterministic with no race or unknown state involved.\nPR:L - An unprivileged local account suffices — on typical desktop/kiosk systems udisks2 lets an active local session mount removable or loop-backed UDF media without root, and the `mv` that reaches `udf_rename()` needs only write access to directories inside the attacker's own image.\nUI:N - A single unprivileged actor performs every step — supplying the image, getting it mounted through the standard removable-media/loop-mount path, and issuing the rename — so no separate victim action is needed.\nS:U - The out-of-bounds access stays within the kernel's own stack and security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - `udf_update_tag()` reads up to roughly 4 KB past the 38-byte on-stack `fileIdentDesc` with a length the attacker chooses via `lengthOfImpUse`, covering caller stack frames, saved registers and return addresses — far beyond a strictly bounded few-byte read.\nI:H - The bug is an attacker-length-controlled memory-safety violation on the kernel stack in the middle of a metadata-update path, consistent with the High integrity rating applied to the same class of crafted-image out-of-bounds access in UDF (e.g. CVE-2025-40044).\nA:H - With a large crafted `lengthOfImpUse`, the CRC loop walks off the top of the 16 KB VMAP_STACK allocation into the guard page, producing an unhandled kernel page fault/oops; the smaller case is a confirmed KMSAN uninitialized-memory report." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "fs/udf/namei.c" ], "versions": [ { "version": "626860c470ff88e5f7f22a282efd1bfe953a1b54", "lessThan": "9c439311c13fc6faab1921441165c9b8b500c83b", "status": "affected", "versionType": "git" }, { "version": "e9109a92d2a95889498bed3719cd2318892171a2", "lessThan": "fe2ead240c31e8d158713beca9d0681a6e6a53ab", "status": "affected", "versionType": "git" }, { "version": "e9109a92d2a95889498bed3719cd2318892171a2", "lessThan": "40d7b3ed52449d36143bab8d3e70926aa61a60f4", "status": "affected", "versionType": "git" }, { "version": "e9109a92d2a95889498bed3719cd2318892171a2", "lessThan": "27ab33854873e6fb958cb074681a0107cc2ecc4c", "status": "affected", "versionType": "git" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "fs/udf/namei.c" ], "versions": [ { "version": "6.3", "status": "affected" }, { "version": "0", "lessThan": "6.3", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.44", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.10.3", "lessThanOrEqual": "6.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.11", "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": "6.3", "versionEndExcluding": "6.6.44" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.3", "versionEndExcluding": "6.10.3" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.3", "versionEndExcluding": "6.11" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/9c439311c13fc6faab1921441165c9b8b500c83b" }, { "url": "https://git.kernel.org/stable/c/fe2ead240c31e8d158713beca9d0681a6e6a53ab" }, { "url": "https://git.kernel.org/stable/c/40d7b3ed52449d36143bab8d3e70926aa61a60f4" }, { "url": "https://git.kernel.org/stable/c/27ab33854873e6fb958cb074681a0107cc2ecc4c" } ], "title": "udf: Fix bogus checksum computation in udf_rename()", "x_generator": { "engine": "bippy-1.2.0" } }, "adp": [ { "metrics": [ { "other": { "type": "ssvc", "content": { "id": "CVE-2024-43845", "role": "CISA Coordinator", "options": [ { "Exploitation": "none" }, { "Automatable": "no" }, { "Technical Impact": "partial" } ], "version": "2.0.3", "timestamp": "2024-09-10T16:07:43.116457Z" } } } ], "title": "CISA ADP Vulnrichment", "providerMetadata": { "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2024-09-12T17:33:22.040Z" } } ] } }