CVE-2025-21672 Information

Description

In the Linux kernel the following vulnerability has been resolved:

afs: Fix merge preference rule failure condition

syzbot reported a lock held when returning to userspace[1]. This is because if argc is less than 0 and the function returns directly the held inode lock is not released.

Fix this by store the error in ret and jump to done to clean up instead of returning directly.

[dh: Modified Lizhi Xu’s original patch to make it honour the error code from afs_split_string()]

[1] WARNING: lock held when returning to user space! 6.13.0-rc3-syzkaller-00209-g499551201b5f 0 Not tainted

syz-executor133/5823 is leaving the kernel with locks still held! 1 lock held by syz-executor133/5823: 0: ffff888071cffc00 (&sb->s_type->i_mutex_key9)++++-4:4 at: inode_lock include/linux/fs.h:818 [inline] 0: ffff888071cffc00 (&sb->s_type->i_mutex_key9)++++-4:4 at: afs_proc_addr_prefs_write+0x2bb/0x14e0 fs/afs/addr_prefs.c:388

Reference

https://git.kernel.org/stable/c/17a4fde81d3a7478d97d15304a6d61094a10c2e3 https://git.kernel.org/stable/c/22be1d90a6211c88dd093b25d1f3aa974d0d9f9d