CVE record · CVE-2026-89652

ceph: bound copied dentry name length in NFS export get_name

CVSS 9.8 CriticalCriticalEPSS 0.0051 · 44th percentile

Critical, because:

CVSS score 9.8: 9.0 or more.

Published by the CVE Program (CNA: Linux) at 11 Sept 2026, 19:45 UTC. agentprime has not analysed this yet, so whether it affects any app is not known. This CVE names a vendor and product rather than a package, so the lockfile check doesn’t match it.

Affected products, as the CNA wrote them
Vendor	Product	Versions
Linux	Linux	affected 19913b4eac4a230dccb548931358398f45dabe4c to before aadfe588ad8032ea99bda259ae7b8d42854f8193 git affected 19913b4eac4a230dccb548931358398f45dabe4c to before 3cb09301c30909a7935e9de41f98eeb5ef7e4d40 git affected 19913b4eac4a230dccb548931358398f45dabe4c to before dff3d84d14142ea43ad61ef5d6b4de05ba16ba42 git affected 19913b4eac4a230dccb548931358398f45dabe4c to before a294064e0e0f81ea607b2f019e16888aa1b0a011 git affected 19913b4eac4a230dccb548931358398f45dabe4c to before 61d9f27b191b838b96b697ce0bfaee39a138243a git affected 19913b4eac4a230dccb548931358398f45dabe4c to before 06fb5e623cdc2402d6bb29be94d9beb9a826ffec git affected 19913b4eac4a230dccb548931358398f45dabe4c to before e7c2fd3893a7f7fcd7e8cf0b2c6348bb1e893df6 git affected 19913b4eac4a230dccb548931358398f45dabe4c to before eff8013c5a8916613c742ae5a2cc341cb605c0ae git Other versions: unaffected
Linux	Linux	affected 3.15 unaffected before 3.15 semver unaffected 5.10.273 to 5.10., inclusive semver unaffected 5.15.224 to 5.15., inclusive semver unaffected 6.1.191 to 6.1., inclusive semver unaffected 6.6.157 to 6.6., inclusive semver unaffected 6.12.109 to 6.12., inclusive semver unaffected 6.18.50 to 6.18., inclusive semver unaffected 7.2.4 to 7.2., inclusive semver unaffected 7.3 to , inclusive original_commit_for_fix Other versions: affected

Identifiers: CVE-2026-89652
CNA: Linux
Tags: Linux kernel
Published: 11 Sept 2026
Updated: 30 Oct 2026

Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

Linux kernel versions with the Ceph client's NFS export get_name path are affected. The flaw is an out-of-bounds write when a malicious or compromised Ceph metadata server returns an oversized name, which is reachable when a CephFS mount is re-exported over NFS. The source lists fixed kernel versions in the 5.10, 5.15, 6.1 and 6.6 series, as well as the upstream fix commits, so upgrade to a fixed kernel release for your branch.

Written 12 Nov 2026.

Not analysed yet

We haven’t published our own analysis of this CVE. If a person reviews it, this page will say what’s affected and what has to be true for it to matter.

Severity and exploitation

Score	Rating	CVSS	Vector	Source
9.8	Critical	3.1	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H	CNA (Linux)

CISA KEV Not listed.
EPSS 0.0051, the 44th percentile, on 14 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

This record came from the full history of the CVE Program, published 11 Sept 2026. New records show when each source confirmed them.

Sources

References from the CNA

Facts on this page come from the CVE List as the CNA published them, with CVSS from the sources named above, CISA KEV and FIRST EPSS. Vendors, products and versions are shown as the CNA wrote them. We don’t reproduce the CVE’s description.