Vulnerability Details 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 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
Exploit prediction scoring system (EPSS) score
EPSS Score 0.0
EPSS Ranking 10.2%
CVSS Severity
CVSS v3 Score 5.5
References
- 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
Products affected by CVE-2022-49688
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cpe:2.3:o:linux:linux_kernel:4.19.245
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cpe:2.3:o:linux:linux_kernel:4.19.246
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cpe:2.3:o:linux:linux_kernel:4.19.247
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cpe:2.3:o:linux:linux_kernel:4.19.248
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cpe:2.3:o:linux:linux_kernel:4.19.249
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cpe:2.3:o:linux:linux_kernel:5.10.118
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cpe:2.3:o:linux:linux_kernel:5.10.119
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cpe:2.3:o:linux:linux_kernel:5.10.120
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cpe:2.3:o:linux:linux_kernel:5.10.121
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cpe:2.3:o:linux:linux_kernel:5.10.122
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cpe:2.3:o:linux:linux_kernel:5.10.123
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cpe:2.3:o:linux:linux_kernel:5.10.124
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cpe:2.3:o:linux:linux_kernel:5.10.125
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cpe:2.3:o:linux:linux_kernel:5.10.126
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cpe:2.3:o:linux:linux_kernel:5.15.42
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cpe:2.3:o:linux:linux_kernel:5.15.43
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cpe:2.3:o:linux:linux_kernel:5.15.44
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cpe:2.3:o:linux:linux_kernel:5.15.45
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cpe:2.3:o:linux:linux_kernel:5.15.46
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cpe:2.3:o:linux:linux_kernel:5.15.47
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cpe:2.3:o:linux:linux_kernel:5.15.48
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cpe:2.3:o:linux:linux_kernel:5.15.49
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cpe:2.3:o:linux:linux_kernel:5.15.50
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cpe:2.3:o:linux:linux_kernel:5.17.10
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cpe:2.3:o:linux:linux_kernel:5.17.11
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cpe:2.3:o:linux:linux_kernel:5.17.12
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cpe:2.3:o:linux:linux_kernel:5.17.13
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cpe:2.3:o:linux:linux_kernel:5.17.14
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cpe:2.3:o:linux:linux_kernel:5.17.15
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cpe:2.3:o:linux:linux_kernel:5.18
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cpe:2.3:o:linux:linux_kernel:5.18.1
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cpe:2.3:o:linux:linux_kernel:5.18.2
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cpe:2.3:o:linux:linux_kernel:5.18.3
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cpe:2.3:o:linux:linux_kernel:5.18.4
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cpe:2.3:o:linux:linux_kernel:5.18.5
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cpe:2.3:o:linux:linux_kernel:5.18.6
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cpe:2.3:o:linux:linux_kernel:5.18.7
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cpe:2.3:o:linux:linux_kernel:5.19
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cpe:2.3:o:linux:linux_kernel:5.4.196
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cpe:2.3:o:linux:linux_kernel:5.4.197
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cpe:2.3:o:linux:linux_kernel:5.4.198
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cpe:2.3:o:linux:linux_kernel:5.4.199
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cpe:2.3:o:linux:linux_kernel:5.4.200
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cpe:2.3:o:linux:linux_kernel:5.4.201