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'…
Impact
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
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Linux | Linux Kernel | from 4.19.245 before 4.19.250 from 5.4.196 before 5.4.202 from 5.10.118 before 5.10.127 from 5.15.42 before 5.15.51 from 5.17.10 before 5.18 from 5.18.1 before 5.18.8 |
Weakness classification
References
- NVD record
- CVE.org record
- https://git.kernel.org/stable/c/2b2bba96526f25f2eba74ecadb031de2e05a83ce
- https://git.kernel.org/stable/c/65c24caf1b9f5b08397c6e805ec24ebc390c6e4d
- https://git.kernel.org/stable/c/7844ceada44eca740d31beb3d97b8511b1ca0a9b
- https://git.kernel.org/stable/c/7b564e3254b7db5fbfbf11a824627a6c31b932b4
- https://git.kernel.org/stable/c/cb78d1b5efffe4cf97e16766329dd7358aed3deb
- https://git.kernel.org/stable/c/e3a232e5767051483ffad4cef7d0a89d292a192b