CVE-2025-71292 (GCVE-0-2025-71292)
Vulnerability from cvelistv5 – Published: 2026-05-06 11:32 – Updated: 2026-08-05 12:12
VLAI
EPSS
VEX
Title
jfs: nlink overflow in jfs_rename
Summary
In the Linux kernel, the following vulnerability has been resolved:
jfs: nlink overflow in jfs_rename
If nlink is maximal for a directory (-1) and inside that directory you
perform a rename for some child directory (not moving from the parent),
then the nlink of the first directory is first incremented and later
decremented. Normally this is fine, but when nlink = -1 this causes a
wrap around to 0, and then drop_nlink issues a warning.
After applying the patch syzbot no longer issues any warnings. I also
ran some basic fs tests to look for any regressions.
Severity
7.5 (High)
Assigner
References
8 references
Impacted products
2 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Linux | Linux |
Affected:
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 2108829a59f081e822fdab8c2cd7131deb8aa8a1
(git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < b4330a0d0947fbdc9d445cbbeabd8cc910a8c9ca (git) Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < a3d66089e50a6e0142f8884471f74292102ea9aa (git) Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < f70fcbc2ac7c24f087a2c895c5753aa730b1e479 (git) Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 5d77c36cd4b698649f5c30c5f6c084f4f61d1880 (git) Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < fe136426e30ca6debcf916fd6a141555ed9fde74 (git) Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 93c325746ae59709b4f9bad4e3e4761c8d566c70 (git) Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 9218dc26fd922b09858ecd3666ed57dfd8098da8 (git) |
guessed | |
| Linux | Linux |
Affected:
2.6.12
Unaffected: 0 , < 2.6.12 (semver) Unaffected: 5.10.252 , ≤ 5.10.* (semver) Unaffected: 5.15.202 , ≤ 5.15.* (semver) Unaffected: 6.1.165 , ≤ 6.1.* (semver) Unaffected: 6.6.128 , ≤ 6.6.* (semver) Unaffected: 6.12.75 , ≤ 6.12.* (semver) Unaffected: 6.18.16 , ≤ 6.18.* (semver) Unaffected: 6.19.6 , ≤ 6.19.* (semver) Unaffected: 7.0 , ≤ * (original_commit_for_fix) |
guessed |
{
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},
{
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},
{
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{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\njfs: nlink overflow in jfs_rename\n\nIf nlink is maximal for a directory (-1) and inside that directory you\nperform a rename for some child directory (not moving from the parent),\nthen the nlink of the first directory is first incremented and later\ndecremented. Normally this is fine, but when nlink = -1 this causes a\nwrap around to 0, and then drop_nlink issues a warning.\n\nAfter applying the patch syzbot no longer issues any warnings. I also\nran some basic fs tests to look for any regressions."
}
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{
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"value": "AV:N - An NFSv3/v4 RENAME on an exported JFS directory follows SunRPC dispatch through nfsd_rename and vfs_rename into jfs_rename. Thus a remote NFS client can reach the vulnerable code.\nAC:L - With the parent nlink at 0xffffffff, one same-parent directory rename deterministically triggers the wrap and warning. No race is required, and the filesystem state can be attacker-controlled.\nPR:N - A writable NFS export permitting anonymous or AUTH_NULL access requires no account or prior privileges. nfsd\u0027s export and directory permission checks still permit the operation when the anonymous identity has write access.\nUI:N - The attacker directly submits the RENAME operation after the affected filesystem state exists. No separate victim action is required in an already mounted and exported JFS deployment.\nS:U - The warning and resulting denial of service affect the same kernel and host processing the filesystem operation. No virtualization, IOMMU, or other security boundary is crossed.\nC:N - The overflow affects only the unsigned link-count field and does not read or disclose memory. The count is restored before the successful transaction commits.\nI:N - There is no out-of-bounds access, use-after-free, or arbitrary write primitive. On the successful path the transient zero link count is restored to 0xffffffff before metadata is dirtied or committed.\nA:H - The repeatable WARN_ON can panic the kernel when panic_on_warn or an applicable warn_limit is configured. Even without those settings, repeated remote renames can continuously generate expensive warning traces."
}
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},
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},
{
"url": "https://git.kernel.org/stable/c/9218dc26fd922b09858ecd3666ed57dfd8098da8"
}
],
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"dateReserved": "2026-05-06T11:31:45.509Z",
"dateUpdated": "2026-08-05T12:12:42.348Z",
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I also\\nran some basic fs tests to look for any 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:true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.7\",\"versionEndExcluding\":\"6.12.75\",\"matchCriteriaId\":\"BCE16369-98ED-41CF-8995-DFDC10B288D2\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.13\",\"versionEndExcluding\":\"6.18.16\",\"matchCriteriaId\":\"B4B8CDA9-BADF-4CF5-8B3B-702DE8EEA40B\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.19\",\"versionEndExcluding\":\"6.19.6\",\"matchCriteriaId\":\"373EEEDA-FAA1-4FB4-B6ED-DB4DD99DBE67\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:2.6.12:-:*:*:*:*:*:*\",\"matchCriteriaId\":\"6F62EECE-8FB1-4D57-85D8-CB9E23CF313C\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:2.6.12:rc2:*:*:*:*:*:*\",\"matchCriteriaId\":\"4F76C298-81DC-43E4-8FC9-DC005A2116EF\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:2.6.12:rc3:*:*:*:*:*:*\",\"matchCriteriaId\":\"0AB349B2-3F78-4197-882B-90ADB3BF645A\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:2.6.12:rc4:*:*:*:*:*:*\",\"matchCriteriaId\":\"6AC88830-A9BC-4607-B572-A4B502FC9FD0\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:2.6.12:rc5:*:*:*:*:*:*\",\"matchCriteriaId\":\"476CB3A5-D022-4F13-AAEF-CB6A5785516A\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:2.6.12:rc6:*:*:*:*:*:*\",\"matchCriteriaId\":\"8CFD5CDD-1709-44C7-82BD-BAFDC46990D6\"}]}]}],\"references\":[{\"url\":\"https://git.kernel.org/stable/c/2108829a59f081e822fdab8c2cd7131deb8aa8a1\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/5d77c36cd4b698649f5c30c5f6c084f4f61d1880\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/9218dc26fd922b09858ecd3666ed57dfd8098da8\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/93c325746ae59709b4f9bad4e3e4761c8d566c70\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/a3d66089e50a6e0142f8884471f74292102ea9aa\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/b4330a0d0947fbdc9d445cbbeabd8cc910a8c9ca\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/f70fcbc2ac7c24f087a2c895c5753aa730b1e479\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/fe136426e30ca6debcf916fd6a141555ed9fde74\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]}]}}",
"redhat_vex": {
"aggregate_severity": "Moderate",
"current_release_date": "2026-07-30T08:32:31+00:00",
"cve": "CVE-2025-71292",
"id": "CVE-2025-71292",
"initial_release_date": "2025-01-01T00:00:00+00:00",
"product_status:known_affected": "14",
"product_status:known_not_affected": "260",
"source": "Red Hat CSAF VEX",
"status": "final",
"title": "kernel: jfs: nlink overflow in jfs_rename",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2025/cve-2025-71292.json",
"version": "3"
},
"suse_vex": {
"aggregate_severity": "moderate",
"current_release_date": "2026-09-02T12:32:42Z",
"cve": "CVE-2025-71292",
"id": "CVE-2025-71292",
"initial_release_date": "2026-05-07T02:24:30Z",
"product_status:known_affected": "4",
"product_status:known_not_affected": "381",
"source": "SUSE CSAF VEX",
"status": "interim",
"title": "SUSE CVE CVE-2025-71292",
"url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2025-71292.json",
"version": "9"
}
}
}
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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.
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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.
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.
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