ext2: Fix lost inode updates for IS_SYNC inodes
Key facts
- Attack vector
- Network
- Privileges required
- Low
- User interaction
- None
- Attack complexity
- Low
- Impact type
- —
- Confidentiality · integrity · availability
- High · High · High
- Fix status
- Partial Red Hat: 2 without a fix
Attack profile from CVSS 3.1 · CNA. Fix status from CNA and Red Hat.
Summary
In the Linux kernel, the following vulnerability has been resolved: ext2: Fix lost inode updates for IS_SYNC inodes ext2_setsize() and ext2_xattr_set2() had a construct like: if (IS_SYNC(inode)) { sync_inode_metadata(inode, 1); } else { mark_inode_dirty(inode); } which leads to lost inode updates for IS_SYNC inodes because sync_inode_metadata() does anything only if the inode is already dirty and hence inode updates may be simply lost. Fix the problem by unconditionally marking the inode dirty and *then* call sync_inode_metadata().
Why it matters now
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
Remediation
- Fix · CNA Linux (Linux) Fixed in 6.1.191, 6.6.160, 6.12.114, 6.18.57, 7.2.4, 7.3
Vendor assessments
Red Hat
Red Hat rating: Low. Red Hat's page for this CVE →
| Product | Status | Plan or fix |
|---|---|---|
| Red Hat Enterprise Linux 6 | Affected | No fix planned: Out of support scope |
| Red Hat OpenShift Container Platform 5 | Affected | No fix yet: Fix deferred |
Not affected: 5 products
- Red Hat Enterprise Linux 10
- Red Hat Enterprise Linux 7
- Red Hat Enterprise Linux 8
- Red Hat Enterprise Linux 9
- Red Hat OpenShift Container Platform 4
Timeline
- 2026-10-02 Threatist record created from CVE-2026-89601
- 2026-10-03 Alias added: GHSA-g65m-jqm9-5xv8
- 2026-10-16 Fix available: Linux/Linux@5481766125041e71662f2e32ee0e91ad5f4d07f4, Linux/[email protected] · CNA
- 2026-10-16 1 new reference · CNA
- 2026-10-19 Fix available: Linux/[email protected] · CNA
- 2026-10-21 Fix available: Linux/[email protected], Linux/[email protected], Linux/Linux@b879565effd88fc119c2efea3f3868a9997ed9ba +1 · CNA
- 2026-10-21 2 new references · CNA
- 2026-10-30 Fix available: Linux/Linux@55e66d84b5272c425b324a2b247cdacacf1e10b9, Linux/[email protected] · CNA
- 2026-10-30 1 new reference · CNA
- 2026-10-30 Affected versions changed · Red Hat
- 2026-10-31 EPSS moved to the 50th–90th percentile
- 2026-11-06 EPSS moved to the below the 50th percentile
References
Other 6
- https://git.kernel.org/stable/c/55e66d84b5272c425b324a2b247cdacacf1e10b9
- https://git.kernel.org/stable/c/b879565effd88fc119c2efea3f3868a9997ed9ba
- https://git.kernel.org/stable/c/e54de654423bee98d1ba50379b09daf97c7854a6
- https://git.kernel.org/stable/c/5481766125041e71662f2e32ee0e91ad5f4d07f4
- https://git.kernel.org/stable/c/5efb3350230fef831167740e69e6db2861101186
- https://git.kernel.org/stable/c/356984d1a5c32e94810cbb6c8dc7d8ff2d4d919a
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Sources
- CVE-2026-89601 · CVE Program
- CVE-2026-89601 · NVD
- FIRST EPSS
- GHSA-g65m-jqm9-5xv8 · GitHub Advisory Database · CC BY 4.0
- CVE-2026-89601 · Red Hat security data · CC BY 4.0
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