Reference page — cumulative record through Sunday, October 4, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.

CVE-2026-23201

CVE-2026-23201MEDIUM

Linux Linux — ceph: fix oops due to invalid pointer for kfree() in parse_longname()

  AV  AC  PR  UI  S  C  I  A   CVSS    EPSS   %ile   KEV
   L   L   L   N  U  N  N  H    5.5   .0012    1.7     —

AFFECTED
  Product  Versions                                    Fixed
  Linux    4b9aee707c4580511983a0998547f3b28514e6a6 –  —
  Linux    6.17 –                                      6.12.70

TIMELINE
  Jan 13  Reserved by Linux
  Feb 14  Published (CNA: Linux)
  Sep 14  ENRICHED — CVE-2026-23201 (Linux). Received CVSS 5.5 and CPE data from NVD.

CWE-476 · CNA: Linux · CVSS v3.1 · 4 references · NVD status: Modified

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 "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.

Lifecycle

Complete event history — 3 events, chronological
Date	Event	Detail
January 13, 2026	Reserved	Reserved by Linux
February 14, 2026	Published	Published (CNA: Linux)
September 14, 2026	ENRICHED	ENRICHED — CVE-2026-23201 (Linux). Received CVSS 5.5 and CPE data from NVD.

Affected

Affected products and packages — 2 rows
Vendor	Product / Package	Ecosystem	Version introduced	Fixed
Linux	Linux	—	4b9aee707c4580511983a0998547f3b28514e6a6	—
Linux	Linux	—	6.17	6.12.70

Weaknesses

CWE-476

References (4)

Authoritative record: CVE-2026-23201 at cve.org

Vendors: linux

Weaknesses: CWE-476

About this page

This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2026-23201 from the CVE Program record, NVD enrichment, the CISA KEV catalog, EPSS, and OSV advisories. The box score's numbers (CVSS, EPSS, KEV status) are current as of Sunday, October 4, 2026 UTC and are re-derived as the archive grows; only dated daily editions are immutable pages of record. The authoritative source for this identifier is cve.org.