CVE-2026-23201ceph: fix oops due to invalid pointer for kfree() in parse_longname()
- 5.5MediumCVSS base score
- 0.14%Exploitation in 30 daysEPSS · top 97% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
Description
In the Linux kernel, the following vulnerability has been resolved: ceph: fix oops due to invalid pointer for kfree() in parse_longname() This fixes a kernel oops when reading ceph snapshot directories (.snap), for example by simply running `ls /mnt/my_ceph/.snap`. The variable str is guarded by __free(kfree), but advanced by one for skipping the initial '_' in snapshot names. Thus, kfree() is called with an invalid pointer. This patch removes the need for advancing the pointer so kfree() is called with correct memory pointer. Steps to reproduce: 1. Create snapshots on a cephfs volume (I've 63 snaps in my testcase) 2. Add cephfs mount to fstab $ echo "[email protected]=/volumes/datapool/stuff/3461082b-ecc9-4e82-8549-3fd2590d3fb6 /mnt/test/stuff ceph acl,noatime,_netdev 0 0" >> /etc/fstab 3. Reboot the system $ systemctl reboot 4. Check if it's really mounted $ mount | grep stuff 5. List snapshots (expected 63 snapshots on my system) $ ls /mnt/test/stuff/.snap Now ls hangs forever and the kernel log shows the oops.
Timeline
ID reserved
By Linux
- 32 days later
· 32 days later
Published
- 7 months later
· 7 months later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| NVDNVD · Modified | 3.1 | Medium5.5 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H |
- EPSS (exploitation in 30 days)
- 0.14% · top 97% of all CVEs (12 Nov 2026)
The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 5.5.
Affected products
- affected 4b9aee707c4580511983a0998547f3b28514e6a6 – < c9a129c82ddf82a50b4f8960d2609714ca2dbd26
- affected bb80f7618832d26f7e395f52f82b1dac76223e5f – < 8c9af7339de419819cfc641d551675d38ff99abf
- affected 101841c38346f4ca41dc1802c867da990ffb32eb – < e258ed369c9e04caa7d2fd49785d753ae4034cb6
- affected 101841c38346f4ca41dc1802c867da990ffb32eb – < bc8dedae022ce3058659c3addef3ec4b41d15e00
- affected 3145b2b11492d61c512bbc59660bb823bc757f48
- affected 493479af8af3ab907f49e99323777d498a4fbd2b
- affected 6.12.42 – < 6.12.70
- affected 6.15.10 – < 6.16
- affected 6.16.1 – < 6.17
- affected 6.17
- unaffected < 6.17
- unaffected 6.12.70 – ≤ 6.12.*
- unaffected 6.18.10 – ≤ 6.18.*
- unaffected 6.19 – ≤ *
References
References4
- https://git.kernel.org/stable/c/c9a129c82ddf82a50b4f8960d2609714ca2dbd26 (opens in a new tab)
- https://git.kernel.org/stable/c/8c9af7339de419819cfc641d551675d38ff99abf (opens in a new tab)
- https://git.kernel.org/stable/c/e258ed369c9e04caa7d2fd49785d753ae4034cb6 (opens in a new tab)
- https://git.kernel.org/stable/c/bc8dedae022ce3058659c3addef3ec4b41d15e00 (opens in a new tab)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2026-5844 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2026-23201)Record last updated .