CVE-2022-49688
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…
Does this matter?
Lower severity and a low EPSS score (0.30%). Track it; it rarely justifies an emergency change on its own.
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
- CVSS 3.1
- 5.5 MEDIUMCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- EPSS
- 0.30% probability · 22th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-476
- Affected
- linux/linux kernel
- Source
- 416baaa9-dc9f-4396-8d5f-8c081fb06d67
References
- https://git.kernel.org/stable/c/2b2bba96526f25f2eba74ecadb031de2e05a83cePatch
- https://git.kernel.org/stable/c/65c24caf1b9f5b08397c6e805ec24ebc390c6e4dPatch
- https://git.kernel.org/stable/c/7844ceada44eca740d31beb3d97b8511b1ca0a9bPatch
- https://git.kernel.org/stable/c/7b564e3254b7db5fbfbf11a824627a6c31b932b4Patch
- https://git.kernel.org/stable/c/cb78d1b5efffe4cf97e16766329dd7358aed3debPatch
- https://git.kernel.org/stable/c/e3a232e5767051483ffad4cef7d0a89d292a192bPatch
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.