CVE-2025-71292Network attack vector

Service interruption via JFS link-count wraparound

Published May 6, 2026 · Updated May 6, 2026

Integer overflow in Linux Kernel JFS allows remote attackers to interrupt service through a rename on an exported writable directory. In jfs_rename, a same-parent child-directory rename increments a maximal 0xffffffff parent link count, wraps it to zero, and makes drop_nlink emit a warning before the later decrement restores the count. Remote reachability requires JFS to be exported over NFS with anonymous write permission; repeated warnings consume resources, and panic-on-warning configurations can crash the host.

CVSS severity7.5
High
EPSS probability0.32%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Integer overflow in Linux Kernel JFS allows remote attackers to interrupt service through a rename on an exported writable directory. In jfs_rename, a same-parent child-directory rename increments a maximal 0xffffffff parent link count, wraps it to zero, and makes drop_nlink emit a warning before the later decrement restores the count. Remote reachability requires JFS to be exported over NFS with anonymous write permission; repeated warnings consume resources, and panic-on-warning configurations can crash the host.

The record

CVE
CVE-2025-71292
Published
May 6, 2026
Updated
May 6, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 6, 2026CVE publishedPublication date reported by the CVE source.
  2. May 6, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <2108829a59f081e822fdab8c2cd7131deb8aa8a1
  2. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <5d77c36cd4b698649f5c30c5f6c084f4f61d1880
  3. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <9218dc26fd922b09858ecd3666ed57dfd8098da8
  4. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <93c325746ae59709b4f9bad4e3e4761c8d566c70
  5. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <a3d66089e50a6e0142f8884471f74292102ea9aa
  6. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <b4330a0d0947fbdc9d445cbbeabd8cc910a8c9ca
  7. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <f70fcbc2ac7c24f087a2c895c5753aa730b1e479
  8. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <fe136426e30ca6debcf916fd6a141555ed9fde74

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <2108829a59f081e822fdab8c2cd7131deb8aa8a1; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <5d77c36cd4b698649f5c30c5f6c084f4f61d1880; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <9218dc26fd922b09858ecd3666ed57dfd8098da8; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <93c325746ae59709b4f9bad4e3e4761c8d566c70; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <a3d66089e50a6e0142f8884471f74292102ea9aa; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <b4330a0d0947fbdc9d445cbbeabd8cc910a8c9ca; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <f70fcbc2ac7c24f087a2c895c5753aa730b1e479; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <fe136426e30ca6debcf916fd6a141555ed9fde74

Published CVSS scores

5.5NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
5.5UbuntuCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
7.5LinuxCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1499.004Endpoint Denial of Service: Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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