Linux vulnerability

What happened

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.

Affected versions

Linux: 4b9aee707c4580511983a0998547f3b28514e6a6 through before c9a129c82ddf82a50b4f8960d2609714ca2dbd26 (git); bb80f7618832d26f7e395f52f82b1dac76223e5f through before 8c9af7339de419819cfc641d551675d38ff99abf (git); 101841c38346f4ca41dc1802c867da990ffb32eb through before e258ed369c9e04caa7d2fd49785d753ae4034cb6 (git); 101841c38346f4ca41dc1802c867da990ffb32eb through before bc8dedae022ce3058659c3addef3ec4b41d15e00 (git); 3145b2b11492d61c512bbc59660bb823bc757f48 (git); 493479af8af3ab907f49e99323777d498a4fbd2b (git); 6.12.42 through before 6.12.70 (semver); 6.15.10 through before 6.16 (semver); 6.16.1 through before 6.17 (semver); 6.17 Fixed: See vendor advisory.

Why it matters

Review the vendor advisory and exposure of the affected product to determine operational impact.

Detection & mitigation

• Apply vendor-provided updates or mitigations.
• Review affected product exposure and access logs.