Description (CNA)
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 (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected b76ea7c06b24dcf97ea3379b6957d5b99c346ea0 before 65c24caf1b9f5b08397c6e805ec24ebc390c6e4d; affected dba1941f5bc3de6b460685155b89ae1182824fc8 before e3a232e5767051483ffad4cef7d0a89d292a192b; affected 61a4cc41e5c1b77d05a12798f8032050aa75f3c8 before 7b564e3254b7db5fbfbf11a824627a6c31b932b4; affected 94bf8bfb009fad247d02f12e4c443411c8445412 before 2b2bba96526f25f2eba74ecadb031de2e05a83ce; affected 2aeb8c86d49967552394d5e723f87454cb53f501 before 7844ceada44eca740d31beb3d97b8511b1ca0a9b; affected 2aeb8c86d49967552394d5e723f87454cb53f501 before cb78d1b5efffe4cf97e16766329dd7358aed3deb; affected 9e655a8b874d7c56e02938ddb221b16e293793df; affected 4.19.245 before 4.19.250; affected 5.4.196 before 5.4.202; affected 5.10.118 before 5.10.127; affected 5.15.42 before 5.15.51; affected 5.17.10 before 5.18 |
| Linux / Linux | affected 5.18; unaffected 0 before 5.18; unaffected 4.19.250 through 4.19.*; unaffected 5.4.202 through 5.4.*; unaffected 5.10.127 through 5.10.*; unaffected 5.15.51 through 5.15.*; unaffected 5.18.8 through 5.18.*; unaffected 5.19 through * |
CWE
No CWE identifiers supplied.
References
- https://git.kernel.org/stable/c/65c24caf1b9f5b08397c6e805ec24ebc390c6e4d
- https://git.kernel.org/stable/c/e3a232e5767051483ffad4cef7d0a89d292a192b
- https://git.kernel.org/stable/c/7b564e3254b7db5fbfbf11a824627a6c31b932b4
- https://git.kernel.org/stable/c/2b2bba96526f25f2eba74ecadb031de2e05a83ce
- https://git.kernel.org/stable/c/7844ceada44eca740d31beb3d97b8511b1ca0a9b
- https://git.kernel.org/stable/c/cb78d1b5efffe4cf97e16766329dd7358aed3deb