NULL Pointer Dereference in kernel-modules-internal | CVE-2022-49688

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Snyk IDSNYK-RHEL9-KERNELMODULESINTERNAL-9112714
published5 Mar 2025
disclosed26 Feb 2025

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Introduced: 26 Feb 2025

CVE-2022-49688 (opens in a new tab) CWE-476 (opens in a new tab)

Amendment

The Red Hat security team deemed this advisory irrelevant for RHEL:9.

NVD Description

Note: Versions mentioned in the description apply only to the upstream kernel-modules-internal package and not the kernel-modules-internal package as distributed by RHEL.

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:
     &lt;TASK&gt;
     vfs_statx+0x79/0xf5
     vfs_fstatat+0x49/0x62

NULL Pointer Dereference The advisory has been revoked - it doesn't affect any version of package kernel-modules-internal (opens in a new tab)