CVE-2024-34027 (GCVE-0-2024-34027)
Vulnerability from cvelistv5 – Published: 2024-06-24 13:56 – Updated: 2026-10-15 00:40
VLAI
EPSS
VEX
Title
f2fs: compress: fix to cover {reserve,release}_compress_blocks() w/ cp_rwsem lock
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.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2024-11-05 14:50 UTC
CWE
- CWE-770 - Allocation of Resources Without Limits or Throttling
Assigner
References
7 references
Impacted products
4 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Linux | Linux |
Affected:
ef8d563f184e1112651f2cbde383d43e599334e8 , < a6e1f7744e9b84f86a629a76024bba8468aa153b
(git)
Affected: ef8d563f184e1112651f2cbde383d43e599334e8 , < b5bac43875aa27ec032dbbb86173baae6dce6182 (git) Affected: ef8d563f184e1112651f2cbde383d43e599334e8 , < 5d47d63883735718825ca2efc4fca6915469774f (git) Affected: ef8d563f184e1112651f2cbde383d43e599334e8 , < 329edb7c9e3b6ca27e6ca67ab1cdda1740fb3a2b (git) Affected: ef8d563f184e1112651f2cbde383d43e599334e8 , < 69136304fd144144a4828c7b7b149d0f80321ba4 (git) Affected: ef8d563f184e1112651f2cbde383d43e599334e8 , < 0a4ed2d97cb6d044196cc3e726b6699222b41019 (git) |
guessed | |
| Linux | Linux |
Affected:
5.8
Unaffected: 0 , < 5.8 (semver) Unaffected: 5.10.219 , ≤ 5.10.* (semver) Unaffected: 5.15.161 , ≤ 5.15.* (semver) Unaffected: 6.1.93 , ≤ 6.1.* (semver) Unaffected: 6.6.33 , ≤ 6.6.* (semver) Unaffected: 6.9.4 , ≤ 6.9.* (semver) Unaffected: 6.10 , ≤ * (original_commit_for_fix) |
guessed | |
| linux | linux_kernel |
Affected:
c75488fb4d82 , < a6e1f7744e9b
(git)
Affected: c75488fb4d82 , < b5bac43875aa (git) Affected: c75488fb4d82 , < 5d47d6388373 (git) Affected: c75488fb4d82 , < 329edb7c9e3b (git) Affected: c75488fb4d82 , < 69136304fd14 (git) Affected: c75488fb4d82 , < 0a4ed2d97cb6 (git) Affected: 5.8 Affected: 0 , < 5.8 (semver) Affected: 5.10.219 , ≤ 5.10* (semver) Affected: 6.1.93 , ≤ 6.1* (semver) Affected: 6.6.33 , ≤ 6.6* (semver) Affected: 6.94 , ≤ 6.9* (semver) Affected: 6.10 , ≤ * (semver) Affected: 5.15.161 , ≤ 5.15* (custom) cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:* |
||
| Siemens | SIMATIC S7-1500 TM MFP - GNU/Linux subsystem |
Affected:
0 , < V1.1.1
(custom)
|
guessed |
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"value": "AV:L - The vulnerability is reached only through the `F2FS_IOC_RELEASE_COMPRESS_BLOCKS` / `F2FS_IOC_RESERVE_COMPRESS_BLOCKS` ioctls issued on a local file descriptor of a mounted f2fs volume. 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."
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-08-05T11:29:52.924Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"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"
}
],
"title": "f2fs: compress: fix to cover {reserve,release}_compress_blocks() w/ cp_rwsem lock",
"x_generator": {
"engine": "bippy-1.2.0"
}
}
},
"cveMetadata": {
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"assignerShortName": "Linux",
"cveId": "CVE-2024-34027",
"datePublished": "2024-06-24T13:56:49.389Z",
"dateReserved": "2024-06-24T13:54:11.051Z",
"dateUpdated": "2026-10-15T00:40:44.472Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
}
}
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Drag nodes to arrange them. Double-click a related vulnerability to open it, or a source to visit its link. The Physics button on the left tunes the layout and the simulation; the legend at the bottom left hides or shows nodes by kind and by sighting type.
Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
Vulnerability timeline
Sightings and recorded dates, grouped by day · UTC
How durations are calculated
Following the VTEM framework (Black Hat USA 2015), time to patch starts when the vendor or a coordinator was informed, total time to patch at discovery, and disclosure to patch at public disclosure; vendor response time runs from the report to its acknowledgement. Time to exploit and time unpatched start at the earliest discovery or report, falling back to public disclosure. Unpatched time ends at the first recorded patch, or the calculation time when no patch is recorded. Exploitation to patch shows the interval between those two events; a published proof of concept is a public exploit, not exploitation.
Each result shows its source dates. A negative interval means the end event came first; when date-only inputs leave the order open, the result says so. Date-only inputs are approximate. The earliest evidence wins: KEV report dates and sightings are labelled as such. Records describing another vulnerability are listed but never calculated from, and a PoC alone does not establish exploitation. Missing patch evidence does not prove that no patch exists. Filters below change the event list only.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.