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redhatcveRedhat.comRH:CVE-2021-47259
HistoryMay 23, 2024 - 2:05 p.m.

CVE-2021-47259

2024-05-2314:05:39
redhat.com
access.redhat.com
3
linux kernel
vulnerability
nfs4_init_client
use-after-free
nfs
kasan
mount
nics
server
clear_bit
refcounting
nfs_put_client

6.5 Medium

AI Score

Confidence

Low

0.0004 Low

EPSS

Percentile

10.3%

In the Linux kernel, the following vulnerability has been resolved: NFS: Fix use-after-free in nfs4_init_client() KASAN reports a use-after-free when attempting to mount two different exports through two different NICs that belong to the same server. Olga was able to hit this with kernels starting somewhere between 5.7 and 5.10, but I traced the patch that introduced the clear_bit() call to 4.13. So something must have changed in the refcounting of the clp pointer to make this call to nfs_put_client() the very last one.

6.5 Medium

AI Score

Confidence

Low

0.0004 Low

EPSS

Percentile

10.3%