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Debian Security Bug TrackerDEBIANCVE:CVE-2021-47259HistoryMay 21, 2024 - 3:15 p.m.
CVE-2021-47259
2024-05-2115:15:14
Debian Security Bug Tracker
security-tracker.debian.org
3
linux
kernel
nfs
vulnerability
use-after-free
nfs4_init_client
kasan
mount
exports
nics
server
patch
clear_bit
refcounting
clp pointer
nfs_put_client
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.
| OS | Version | Architecture | Package | Version | Filename |
|---|---|---|---|---|---|
| Debian | 12 | all | linux | < 5.10.46-1 | linux_5.10.46-1_all.deb |
| Debian | 11 | all | linux | < 5.10.46-1 | linux_5.10.46-1_all.deb |
| Debian | 10 | all | linux | < 4.19.208-1 | linux_4.19.208-1_all.deb |
| Debian | 999 | all | linux | < 5.10.46-1 | linux_5.10.46-1_all.deb |
| Debian | 13 | all | linux | < 5.10.46-1 | linux_5.10.46-1_all.deb |
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