CVE-2024-34027 (GCVE-0-2024-34027)
Vulnerability from cvelistv5
Published
2024-06-24 13:56
Modified
2026-08-05 11:29
Severity ?
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: f2fs: compress: fix to cover {reserve,release}_compress_blocks() w/ cp_rwsem lock It needs to cover {reserve,release}_compress_blocks() w/ cp_rwsem lock to avoid racing with checkpoint, otherwise, filesystem metadata including blkaddr in dnode, inode fields and .total_valid_block_count may be corrupted after SPO case.
References
Impacted products
Vendor Product Version
Linux Linux Version: ef8d563f184e1112651f2cbde383d43e599334e8
Version: ef8d563f184e1112651f2cbde383d43e599334e8
Version: ef8d563f184e1112651f2cbde383d43e599334e8
Version: ef8d563f184e1112651f2cbde383d43e599334e8
Version: ef8d563f184e1112651f2cbde383d43e599334e8
Version: ef8d563f184e1112651f2cbde383d43e599334e8
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There is no remote or network-facing path into `f2fs_{release,reserve}_compress_blocks()`.\\nAC:L - The attacker drives both sides of the race \\u2014 one thread loops the compress-block ioctls while another loops unprivileged `syncfs()`, which calls `f2fs_sync_fs(sb, 1)` \\u2192 `f2fs_issue_checkpoint()`, so the racing checkpoint is attacker-scheduled rather than incidental. Once won, the inconsistent metadata is written to persistent storage and stays there, and f2fs compression is broadly deployed (Android GKI enables `CONFIG_F2FS_FS_COMPRESSION`), so no condition outside the attacker\u0027s influence is needed to reach the corrupt state.\\nPR:L - Both ioctls carry no `capable()` or `CAP_SYS_ADMIN` check \\u2014 unlike the adjacent `F2FS_IOC_RESIZE_FS`/`GARBAGE_COLLECT` handlers \\u2014 and setting `FS_COMPR_FL` requires only `inode_owner_or_capable`. Any unprivileged local user with a file on a rw-mounted compression-enabled f2fs volume can create a compressed file and invoke them.\\nUI:N - The attacker operates entirely on a file it creates and owns on an already-mounted filesystem, in a self-contained two-thread loop. No action by any other user or administrator is required.\\nS:U - The corruption is confined to the f2fs filesystem metadata managed by the same kernel security authority that hosts the vulnerable code. No VM, IOMMU, or sandbox boundary is crossed.\\nC:H - The persisted mismatch between inode compress accounting (`i_blocks`, `i_compr_blocks`, `FI_COMPRESS_RELEASED`) and the dnode blkaddr layout means a compressed cluster can be decompressed using a block count that no longer matches its real extent, surfacing content of blocks outside the file \\u2014 a cross-file disclosure on a shared volume, which is why the fs is flagged `SBI_NEED_FSCK` rather than merely losing space.\\nI:H - An unprivileged user achieves persistent, unauthorized corruption of shared on-disk filesystem metadata \\u2014 dnode block addresses, inode `i_blocks`/`i_compr_blocks`, and the volume-global `total_valid_block_count` \\u2014 affecting the entire filesystem and not just the attacker\u0027s own file, repairable only by fsck.\\nA:H - After the unclean mount, `f2fs_sanity_check_ckpt()` rejects the volume with \\\"Wrong valid_user_blocks\\\" (`-EFSCORRUPTED`), rendering an f2fs root or `/data` unmountable and the device unbootable; `dec_valid_block_count()`\u0027s `f2fs_bug_on(sbi, sbi-\u003etotal_valid_block_count \u003c count)` also yields a `BUG_ON` kernel panic under `CONFIG_F2FS_CHECK_FS`, with `SBI_NEED_FSCK`/forced read-only otherwise.\"}]}], \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"ef8d563f184e1112651f2cbde383d43e599334e8\", \"lessThan\": \"a6e1f7744e9b84f86a629a76024bba8468aa153b\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"ef8d563f184e1112651f2cbde383d43e599334e8\", \"lessThan\": \"b5bac43875aa27ec032dbbb86173baae6dce6182\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"ef8d563f184e1112651f2cbde383d43e599334e8\", \"lessThan\": \"5d47d63883735718825ca2efc4fca6915469774f\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"ef8d563f184e1112651f2cbde383d43e599334e8\", \"lessThan\": \"329edb7c9e3b6ca27e6ca67ab1cdda1740fb3a2b\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"ef8d563f184e1112651f2cbde383d43e599334e8\", \"lessThan\": \"69136304fd144144a4828c7b7b149d0f80321ba4\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"ef8d563f184e1112651f2cbde383d43e599334e8\", \"lessThan\": \"0a4ed2d97cb6d044196cc3e726b6699222b41019\", \"versionType\": \"git\"}], \"programFiles\": [\"fs/f2fs/file.c\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"5.8\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"5.8\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"5.10.219\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.10.*\"}, {\"status\": \"unaffected\", \"version\": \"5.15.161\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.15.*\"}, {\"status\": \"unaffected\", \"version\": \"6.1.93\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.1.*\"}, {\"status\": \"unaffected\", \"version\": \"6.6.33\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.6.*\"}, {\"status\": \"unaffected\", \"version\": \"6.9.4\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.9.*\"}, {\"status\": \"unaffected\", \"version\": \"6.10\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"fs/f2fs/file.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/a6e1f7744e9b84f86a629a76024bba8468aa153b\"}, {\"url\": \"https://git.kernel.org/stable/c/b5bac43875aa27ec032dbbb86173baae6dce6182\"}, {\"url\": \"https://git.kernel.org/stable/c/5d47d63883735718825ca2efc4fca6915469774f\"}, {\"url\": \"https://git.kernel.org/stable/c/329edb7c9e3b6ca27e6ca67ab1cdda1740fb3a2b\"}, {\"url\": \"https://git.kernel.org/stable/c/69136304fd144144a4828c7b7b149d0f80321ba4\"}, {\"url\": \"https://git.kernel.org/stable/c/0a4ed2d97cb6d044196cc3e726b6699222b41019\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\nf2fs: compress: fix to cover {reserve,release}_compress_blocks() w/ cp_rwsem lock\\n\\nIt needs to cover {reserve,release}_compress_blocks() w/ cp_rwsem lock\\nto avoid racing with checkpoint, otherwise, filesystem metadata including\\nblkaddr in dnode, inode fields and .total_valid_block_count may be\\ncorrupted after SPO case.\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.219\", \"versionStartIncluding\": \"5.8\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.161\", \"versionStartIncluding\": \"5.8\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.93\", \"versionStartIncluding\": \"5.8\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6.33\", \"versionStartIncluding\": \"5.8\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.9.4\", \"versionStartIncluding\": \"5.8\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.10\", \"versionStartIncluding\": \"5.8\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-08-05T11:29:52.924Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2024-34027\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-08-05T11:29:52.924Z\", \"dateReserved\": \"2024-06-24T13:54:11.051Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-06-24T13:56:49.389Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


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