CVE-2026-23201 (GCVE-0-2026-23201)
Vulnerability from cvelistv5
Published
2026-02-14 16:27
Modified
2026-05-23 16:04
Severity ?
Summary
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.
References
Impacted products
Vendor Product Version
Linux Linux Version: bb80f7618832d26f7e395f52f82b1dac76223e5f
Version: 101841c38346f4ca41dc1802c867da990ffb32eb
Version: 101841c38346f4ca41dc1802c867da990ffb32eb
Version: 3145b2b11492d61c512bbc59660bb823bc757f48
Version: 493479af8af3ab907f49e99323777d498a4fbd2b
Version: 6.12.42   ≤
Version: 6.15.10   ≤
Version: 6.16.1   ≤
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      "descriptions": [
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          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nceph: fix oops due to invalid pointer for kfree() in parse_longname()\n\nThis fixes a kernel oops when reading ceph snapshot directories (.snap),\nfor example by simply running `ls /mnt/my_ceph/.snap`.\n\nThe variable str is guarded by __free(kfree), but advanced by one for\nskipping the initial \u0027_\u0027 in snapshot names. Thus, kfree() is called\nwith an invalid pointer.  This patch removes the need for advancing the\npointer so kfree() is called with correct memory pointer.\n\nSteps to reproduce:\n\n1. Create snapshots on a cephfs volume (I\u0027ve 63 snaps in my testcase)\n\n2. Add cephfs mount to fstab\n$ echo \"samba-fileserver@.files=/volumes/datapool/stuff/3461082b-ecc9-4e82-8549-3fd2590d3fb6      /mnt/test/stuff   ceph     acl,noatime,_netdev    0       0\" \u003e\u003e /etc/fstab\n\n3. Reboot the system\n$ systemctl reboot\n\n4. Check if it\u0027s really mounted\n$ mount | grep stuff\n\n5. List snapshots (expected 63 snapshots on my system)\n$ ls /mnt/test/stuff/.snap\n\nNow ls hangs forever and the kernel log shows the oops."
        }
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      "providerMetadata": {
        "dateUpdated": "2026-05-23T16:04:07.069Z",
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        "shortName": "Linux"
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        },
        {
          "url": "https://git.kernel.org/stable/c/bc8dedae022ce3058659c3addef3ec4b41d15e00"
        }
      ],
      "title": "ceph: fix oops due to invalid pointer for kfree() in parse_longname()",
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  "cveMetadata": {
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-23201",
    "datePublished": "2026-02-14T16:27:25.693Z",
    "dateReserved": "2026-01-13T15:37:45.986Z",
    "dateUpdated": "2026-05-23T16:04:07.069Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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