CVE-2022-49688

afs: Fix dynamic root getattr

State: Published
Severity: Not scored
Published: Feb 26, 2025
Updated: May 23, 2026
Reserved: Feb 26, 2025

Description

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

afs: Fix dynamic root getattr

The recent patch to make afs_getattr consult the server didn't account for the pseudo-inodes employed by the dynamic root-type afs superblock not having a volume or a server to access, and thus an oops occurs if such a directory is stat'd.

Fix this by checking to see if the vnode->volume pointer actually points anywhere before following it in afs_getattr().

This can be tested by stat'ing a directory in /afs. It may be sufficient just to do "ls /afs" and the oops looks something like:

BUG: kernel NULL pointer dereference, address: 0000000000000020 ... RIP: 0010:afs_getattr+0x8b/0x14b ... Call Trace: <TASK> vfs_statx+0x79/0xf5 vfs_fstatat+0x49/0x62

Scores

The record has no CVSS score.

Weaknesses

The record names no weakness.

Affected Products

Product	Versions
LinuxLinux	b76ea7c06b24dcf97ea3379b6957d5b99c346ea0 to before 65c24caf1b9f5b08397c6e805ec24ebc390c6e4dAffected dba1941f5bc3de6b460685155b89ae1182824fc8 to before e3a232e5767051483ffad4cef7d0a89d292a192bAffected 61a4cc41e5c1b77d05a12798f8032050aa75f3c8 to before 7b564e3254b7db5fbfbf11a824627a6c31b932b4Affected 94bf8bfb009fad247d02f12e4c443411c8445412 to before 2b2bba96526f25f2eba74ecadb031de2e05a83ceAffected 2aeb8c86d49967552394d5e723f87454cb53f501 to before 7844ceada44eca740d31beb3d97b8511b1ca0a9bAffected 2aeb8c86d49967552394d5e723f87454cb53f501 to before cb78d1b5efffe4cf97e16766329dd7358aed3debAffected 9e655a8b874d7c56e02938ddb221b16e293793dfAffected 4.19.245 to before 4.19.250Affected 5.4.196 to before 5.4.202Affected 5.10.118 to before 5.10.127Affected 5.15.42 to before 5.15.51Affected 5.17.10 to before 5.18Affected
LinuxLinux	5.18Affected before 5.18Not affected 4.19.250 through 4.19.Not affected 5.4.202 through 5.4.Not affected 5.10.127 through 5.10.Not affected 5.15.51 through 5.15.Not affected 5.18.8 through 5.18.*Not affected 5.19 and laterNot affected

Product

Versions

LinuxLinux

b76ea7c06b24dcf97ea3379b6957d5b99c346ea0 to before 65c24caf1b9f5b08397c6e805ec24ebc390c6e4dAffected
dba1941f5bc3de6b460685155b89ae1182824fc8 to before e3a232e5767051483ffad4cef7d0a89d292a192bAffected
61a4cc41e5c1b77d05a12798f8032050aa75f3c8 to before 7b564e3254b7db5fbfbf11a824627a6c31b932b4Affected
94bf8bfb009fad247d02f12e4c443411c8445412 to before 2b2bba96526f25f2eba74ecadb031de2e05a83ceAffected
2aeb8c86d49967552394d5e723f87454cb53f501 to before 7844ceada44eca740d31beb3d97b8511b1ca0a9bAffected
2aeb8c86d49967552394d5e723f87454cb53f501 to before cb78d1b5efffe4cf97e16766329dd7358aed3debAffected
9e655a8b874d7c56e02938ddb221b16e293793dfAffected
4.19.245 to before 4.19.250Affected
5.4.196 to before 5.4.202Affected
5.10.118 to before 5.10.127Affected
5.15.42 to before 5.15.51Affected
5.17.10 to before 5.18Affected

LinuxLinux

5.18Affected
before 5.18Not affected
4.19.250 through 4.19.*Not affected
5.4.202 through 5.4.*Not affected
5.10.127 through 5.10.*Not affected
5.15.51 through 5.15.*Not affected
5.18.8 through 5.18.*Not affected
5.19 and laterNot affected

References

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