{"dataType":"CVE_RECORD","cveMetadata":{"cveId":"CVE-2024-26601","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","state":"PUBLISHED","assignerShortName":"Linux","dateReserved":"2024-02-19T14:20:24.128Z","datePublished":"2024-02-24T14:56:56.324Z","dateUpdated":"2026-08-05T11:26:11.866Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2026-08-05T11:26:11.866Z"},"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\next4: regenerate buddy after block freeing failed if under fc replay\n\nThis mostly reverts commit 6bd97bf273bd (\"ext4: remove redundant\nmb_regenerate_buddy()\") and reintroduces mb_regenerate_buddy(). Based on\ncode in mb_free_blocks(), fast commit replay can end up marking as free\nblocks that are already marked as such. This causes corruption of the\nbuddy bitmap so we need to regenerate it in that case."}],"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 vulnerable branch is only entered while `EXT4_FC_REPLAY` is set, i.e. during fast-commit journal recovery performed by the `mount()` syscall on a local block device or loop-mounted image. There is no network-facing consumer of this path.\nAC:L - The attacker fully authors the filesystem image — fast-commit DEL_RANGE tags, extent trees and block bitmaps — so arranging a free of an already-free block is deterministic, with no race or memory-layout condition outside their control.\nPR:L - An unprivileged local user supplies the crafted ext4 image via removable media or a loop/user-mountable device; udisks2-style automounters and autofs perform the mount, and mounting in a user namespace also reaches this code without real root.\nUI:N - Automount daemons mount attacker-supplied removable media without any action by another user, and the fc replay runs unconditionally during that mount.\nS:U - The corruption is confined to ext4's in-kernel allocator metadata and the mounted filesystem; it stays within the kernel's own security authority with no VM/IOMMU boundary crossed.\nC:H - A group left with an inflated `bb_free` and a stale buddy is not quarantined, so mballoc can hand the attacker blocks whose true state it has lost track of, exposing residual on-disk contents of other files; the inconsistent metadata is also read back out of bounds of what the bitmap actually describes.\nI:H - The block allocator's authoritative accounting is left corrupt and the group stays in service, so subsequent allocations write through aliased/incorrectly-tracked blocks, corrupting other files' data and on-disk filesystem metadata.\nA:H - The desynchronized buddy reaches `BUG_ON`s in `mb_mark_used()` and `MB_CHECK_ASSERT()` in `mb_check_buddy()`, and the `ext4_grp_locked_error()` paths panic outright because the crafted image's `s_errors` field can select `errors=panic`; at minimum the filesystem is forced read-only."}]}],"affected":[{"product":"Linux","vendor":"Linux","defaultStatus":"unaffected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/ext4/mballoc.c"],"versions":[{"version":"0983142c5f17a62055ec851372273c3bc77e4788","lessThan":"94ebf71bddbcd4ab1ce43ae32c6cb66396d2d51a","status":"affected","versionType":"git"},{"version":"6bd97bf273bdb4944904e57480f6545bca48ad77","lessThan":"c1317822e2de80e78f137d3a2d99febab1b80326","status":"affected","versionType":"git"},{"version":"6bd97bf273bdb4944904e57480f6545bca48ad77","lessThan":"78327acd4cdc4a1601af718b781eece577b6b7d4","status":"affected","versionType":"git"},{"version":"6bd97bf273bdb4944904e57480f6545bca48ad77","lessThan":"ea42d6cffb0dd27a417f410b9d0011e9859328cb","status":"affected","versionType":"git"},{"version":"6bd97bf273bdb4944904e57480f6545bca48ad77","lessThan":"6b0d48647935e4b8c7b75d1eccb9043fcd4ee581","status":"affected","versionType":"git"},{"version":"6bd97bf273bdb4944904e57480f6545bca48ad77","lessThan":"c9b528c35795b711331ed36dc3dbee90d5812d4e","status":"affected","versionType":"git"},{"version":"5.10.181","lessThan":"5.10.211","status":"affected","versionType":"semver"}]},{"product":"Linux","vendor":"Linux","defaultStatus":"affected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/ext4/mballoc.c"],"versions":[{"version":"5.11","status":"affected"},{"version":"0","lessThan":"5.11","status":"unaffected","versionType":"semver"},{"version":"5.10.211","lessThanOrEqual":"5.10.*","status":"unaffected","versionType":"semver"},{"version":"5.15.150","lessThanOrEqual":"5.15.*","status":"unaffected","versionType":"semver"},{"version":"6.1.78","lessThanOrEqual":"6.1.*","status":"unaffected","versionType":"semver"},{"version":"6.6.17","lessThanOrEqual":"6.6.*","status":"unaffected","versionType":"semver"},{"version":"6.7.5","lessThanOrEqual":"6.7.*","status":"unaffected","versionType":"semver"},{"version":"6.8","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":"5.10.181","versionEndExcluding":"5.10.211"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.11","versionEndExcluding":"5.15.150"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.11","versionEndExcluding":"6.1.78"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.11","versionEndExcluding":"6.6.17"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.11","versionEndExcluding":"6.7.5"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.11","versionEndExcluding":"6.8"}]}]}],"references":[{"url":"https://git.kernel.org/stable/c/94ebf71bddbcd4ab1ce43ae32c6cb66396d2d51a"},{"url":"https://git.kernel.org/stable/c/c1317822e2de80e78f137d3a2d99febab1b80326"},{"url":"https://git.kernel.org/stable/c/78327acd4cdc4a1601af718b781eece577b6b7d4"},{"url":"https://git.kernel.org/stable/c/ea42d6cffb0dd27a417f410b9d0011e9859328cb"},{"url":"https://git.kernel.org/stable/c/6b0d48647935e4b8c7b75d1eccb9043fcd4ee581"},{"url":"https://git.kernel.org/stable/c/c9b528c35795b711331ed36dc3dbee90d5812d4e"}],"title":"ext4: regenerate buddy after block freeing failed if under fc replay","x_generator":{"engine":"bippy-1.2.0"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"id":"CVE-2024-26601","role":"CISA Coordinator","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"version":"2.0.3","timestamp":"2024-03-01T15:48:58.021731Z"}}}],"providerMetadata":{"orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","shortName":"CISA-ADP","dateUpdated":"2024-06-04T17:48:55.950Z"}},{"providerMetadata":{"orgId":"af854a3a-2127-422b-91ae-364da2661108","shortName":"CVE","dateUpdated":"2024-08-02T00:07:19.651Z"},"title":"CVE Program Container","references":[{"url":"https://git.kernel.org/stable/c/94ebf71bddbcd4ab1ce43ae32c6cb66396d2d51a","tags":["x_transferred"]},{"url":"https://git.kernel.org/stable/c/c1317822e2de80e78f137d3a2d99febab1b80326","tags":["x_transferred"]},{"url":"https://git.kernel.org/stable/c/78327acd4cdc4a1601af718b781eece577b6b7d4","tags":["x_transferred"]},{"url":"https://git.kernel.org/stable/c/ea42d6cffb0dd27a417f410b9d0011e9859328cb","tags":["x_transferred"]},{"url":"https://git.kernel.org/stable/c/6b0d48647935e4b8c7b75d1eccb9043fcd4ee581","tags":["x_transferred"]},{"url":"https://git.kernel.org/stable/c/c9b528c35795b711331ed36dc3dbee90d5812d4e","tags":["x_transferred"]},{"url":"https://lists.debian.org/debian-lts-announce/2024/06/msg00017.html","tags":["x_transferred"]}]}]},"dataVersion":"5.2"}