CVE-2026-23201ceph: fix oops due to invalid pointer for kfree() in parse_longname()
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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 "samba-fileserver@.files=/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.
- CVSS
- 5.5 MEDIUM (v3.1, NVD)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Modified
- Record last updated
- Sep 14, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Linux Linux linux:linux (from the name) | from 4b9aee707c4580511983a0998547f3b28514e6a6 before c9a129c82ddf82a50b4f8960d2609714ca2dbd26; from bb80f7618832d26f7e395f52f82b1dac76223e5f before 8c9af7339de419819cfc641d551675d38ff99abf; from 101841c38346f4ca41dc1802c867da990ffb32eb before e258ed369c9e04caa7d2fd49785d753ae4034cb6; from 101841c38346f4ca41dc1802c867da990ffb32eb before bc8dedae022ce3058659c3addef3ec4b41d15e00; 3145b2b11492d61c512bbc59660bb823bc757f48; 493479af8af3ab907f49e99323777d498a4fbd2b; from 6.12.42 before 6.12.70; from 6.15.10 before 6.16; and 1 more ranges | CNA record |
linux linux_kernel linux:linux_kernel | from 6.12.42 before 6.12.70; from 6.15.10 before 6.16; from 6.16.1 before 6.18.10; 6.19; 6.19; 6.19; 6.19; 6.19; and 3 more ranges | NVD |
References
- https://git.kernel.org/stable/c/c9a129c82ddf82a50b4f8960d2609714ca2dbd26
- https://git.kernel.org/stable/c/8c9af7339de419819cfc641d551675d38ff99abfpatch
- https://git.kernel.org/stable/c/e258ed369c9e04caa7d2fd49785d753ae4034cb6patch
- https://git.kernel.org/stable/c/bc8dedae022ce3058659c3addef3ec4b41d15e00patch
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.