GHSA-3MG9-9F72-H562
Vulnerability from github – Published: 2026-02-14 18:30 – Updated: 2026-09-14 12:31In 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:
-
Create snapshots on a cephfs volume (I've 63 snaps in my testcase)
-
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
-
Reboot the system $ systemctl reboot
-
Check if it's really mounted $ mount | grep stuff
-
List snapshots (expected 63 snapshots on my system) $ ls /mnt/test/stuff/.snap
Now ls hangs forever and the kernel log shows the oops.
{
"affected": [],
"aliases": [
"CVE-2026-23201"
],
"database_specific": {
"cwe_ids": [
"CWE-476"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2026-02-14T17:15:57Z",
"severity": "MODERATE"
},
"details": "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.",
"id": "GHSA-3mg9-9f72-h562",
"modified": "2026-09-14T12:31:28Z",
"published": "2026-02-14T18:30:16Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-23201"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/8c9af7339de419819cfc641d551675d38ff99abf"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/bc8dedae022ce3058659c3addef3ec4b41d15e00"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/c9a129c82ddf82a50b4f8960d2609714ca2dbd26"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/e258ed369c9e04caa7d2fd49785d753ae4034cb6"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
"type": "CVSS_V3"
}
]
}
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