CVE-2021-47259
- Source
- https://nvd.nist.gov/vuln/detail/CVE-2021-47259
- Import Source
- https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2021-47259.json
- JSON Data
- https://api.test.osv.dev/v1/vulns/CVE-2021-47259
- Downstream
- Related
- Published
- 2024-05-21T15:15:14Z
- Modified
- 2025-08-09T20:01:25Z
- Summary
- [none]
- Details
-
In the Linux kernel, the following vulnerability has been resolved:
NFS: Fix use-after-free in nfs4initclient()
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 clearbit() call to 4.13. So something must have changed in the refcounting of the clp pointer to make this call to nfsput_client() the very last one.
- References
-
- https://git.kernel.org/stable/c/3e3c7ebbfac152d08be75c92802a64a1f6471a15
- https://git.kernel.org/stable/c/42c10b0db064e45f5c5ae7019bbf2168ffab766c
- https://git.kernel.org/stable/c/476bdb04c501fc64bf3b8464ffddefc8dbe01577
- https://git.kernel.org/stable/c/72651c6579a25317a90536181d311c663d0329ab
- https://git.kernel.org/stable/c/c3b6cf64dfe4ef96e7341508d50d6998da7062c7
- https://git.kernel.org/stable/c/c7eab9e2d7b4e983ce280276fb920af649955897