CVE-2022-48920

Technical Description

In the Linux kernel, the following vulnerability has been resolved:

btrfs: get rid of warning on transaction commit when using flushoncommit

When using the flushoncommit mount option, during almost every transaction

commit we trigger a warning from __writeback_inodes_sb_nr():

$ cat fs/fs-writeback.c:

(...)

static void __writeback_inodes_sb_nr(struct super_block *sb, ...

{

(...)

WARN_ON(!rwsem_is_locked(&sb->s_umount));

(...)

}

(...)

The trace produced in dmesg looks like the following:

[947.473890] WARNING: CPU: 5 PID: 930 at fs/fs-writeback.c:2610 __writeback_inodes_sb_nr+0x7e/0xb3

[947.481623] Modules linked in: nfsd nls_cp437 cifs asn1_decoder cifs_arc4 fscache cifs_md4 ipmi_ssif

[947.489571] CPU: 5 PID: 930 Comm: btrfs-transacti Not tainted 95.16.3-srb-asrock-00001-g36437ad63879 #186

[947.497969] RIP: 0010:__writeback_inodes_sb_nr+0x7e/0xb3

[947.502097] Code: 24 10 4c 89 44 24 18 c6 (...)

[947.519760] RSP: 0018:ffffc90000777e10 E

Remediation

Check the references section for vendor advisories and patches from linux. Update linux_kernel to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

Affected Products

References