{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2024-56597", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2024-12-27T14:03:06.010Z", "datePublished": "2024-12-27T14:51:04.184Z", "dateUpdated": "2026-08-05T11:45:16.339Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T11:45:16.339Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\njfs: fix shift-out-of-bounds in dbSplit\n\nWhen dmt_budmin is less than zero, it causes errors\nin the later stages. Added a check to return an error beforehand\nin dbAllocCtl itself." } ], "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 poisoned `dmt_budmin` byte only reaches `dbSplit()` after a local mount of an attacker-supplied JFS image or block device, via loop mount or removable media; there is no network or adjacent-network path into the JFS block allocator.\nAC:L - `budmin` is a single s8 field in the on-disk dmap page that the attacker sets directly in the crafted image, and any subsequent block allocation deterministically drives `dbAllocCtl() → dbAllocDmapLev() → dbAllocDmap() → dbAllocBits() → dbSplit()`; no race, timing, or memory-layout condition outside the attacker's control is involved.\nPR:L - An unprivileged local user gets an attacker-crafted image mounted through loop devices or desktop/kiosk automounters (udisks2, systemd) that mount removable media on their behalf, and this is how the repo scores equivalent on-disk validation bugs (CVE-2025-22079, CVE-2024-56692, CVE-2024-58094).\nUI:N - In the automount/loop scenario the attacker performs both the mount and the subsequent write that triggers block allocation, so no separate victim action is required.\nS:U - The corrupted dmap summary tree, the out-of-range indices, and any resulting crash all remain inside the kernel's own security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - The undefined `1 << (cursz - budmin)` shift yields out-of-range buddy indices that are used to index the dmap summary tree, and on the paired free path `dbJoin()` dereferences `leaf[leafno ^ budsz]` with no bounds check at all, giving out-of-bounds reads of kernel memory adjacent to the metapage.\nI:H - Bogus `budsz` values cause `dbAdjTree()` to write attacker-influenced leaf values into wrong slots of the block allocation map, so the same disk blocks can be handed out to both file data and filesystem metadata — arbitrary corruption of on-disk state — and because the shift is undefined behaviour the computed index is not reliably contained.\nA:H - The shift-out-of-bounds is a UBSAN report that panics under `CONFIG_UBSAN_TRAP` or `panic_on_warn`, the `WARN_ON_ONCE` in `dbAdjTree()` is likewise fatal with `panic_on_warn`, and the corrupted allocation state drives `jfs_error()`/filesystem shutdown — all kernel-level denial of service." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "fs/jfs/jfs_dmap.c" ], "versions": [ { "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "bbb24ce7f06ef9b7c05beb9340787cbe9fd3d08e", "status": "affected", "versionType": "git" }, { "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "df7c76636952670b31bd6c12b3aed3c502122273", "status": "affected", "versionType": "git" }, { "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "6676034aa753aa448beb30dbd75630927ba7cd96", "status": "affected", "versionType": "git" }, { "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "51a203470f502a64a3da8dcea51c4748e8267a6c", "status": "affected", "versionType": "git" }, { "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "c56245baf3fd1f79145dd7408e3ead034b74255c", "status": "affected", "versionType": "git" }, { "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "52756a57e978e2706543a254f88f266cc6702f36", "status": "affected", "versionType": "git" }, { "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "a5f5e4698f8abbb25fe4959814093fb5bfa1aa9d", "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/jfs/jfs_dmap.c" ], "versions": [ { "version": "2.6.12", "status": "affected" }, { "version": "0", "lessThan": "2.6.12", "status": "unaffected", "versionType": "semver" }, { "version": "5.4.287", "lessThanOrEqual": "5.4.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.10.231", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.174", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.120", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.66", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.5", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.13", "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": "2.6.12", "versionEndExcluding": "5.4.287" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.12", "versionEndExcluding": "5.10.231" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.12", "versionEndExcluding": "5.15.174" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.12", "versionEndExcluding": "6.1.120" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.12", "versionEndExcluding": "6.6.66" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.12", "versionEndExcluding": "6.12.5" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.12", "versionEndExcluding": "6.13" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/bbb24ce7f06ef9b7c05beb9340787cbe9fd3d08e" }, { "url": "https://git.kernel.org/stable/c/df7c76636952670b31bd6c12b3aed3c502122273" }, { "url": "https://git.kernel.org/stable/c/6676034aa753aa448beb30dbd75630927ba7cd96" }, { "url": "https://git.kernel.org/stable/c/51a203470f502a64a3da8dcea51c4748e8267a6c" }, { "url": "https://git.kernel.org/stable/c/c56245baf3fd1f79145dd7408e3ead034b74255c" }, { "url": "https://git.kernel.org/stable/c/52756a57e978e2706543a254f88f266cc6702f36" }, { "url": "https://git.kernel.org/stable/c/a5f5e4698f8abbb25fe4959814093fb5bfa1aa9d" } ], "title": "jfs: fix shift-out-of-bounds in dbSplit", "x_generator": { "engine": "bippy-1.2.0" } }, "adp": [ { "title": "CVE Program Container", "references": [ { "url": "https://lists.debian.org/debian-lts-announce/2025/03/msg00001.html" }, { "url": "https://lists.debian.org/debian-lts-announce/2025/03/msg00002.html" } ], "providerMetadata": { "orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2025-11-03T20:50:30.604Z" } } ] } }