linux: An out-of-bounds (OOB) memory write flaw was found in the NFSD in the Linux kernel
CVE-2021-4090 is fixed in linux on 1 platform, first by DEBIAN-CVE-2021-4090, released February 18, 2022. It is not reported as exploited. Patch Radar priority: High.
An out-of-bounds (OOB) memory write flaw was found in the NFSD in the Linux kernel. Missing sanity may lead to a write beyond bmval[bmlen-1] in nfsd4_decode_bitmap4 in fs/nfsd/nfs4xdr.c. In this flaw, a local attacker with user privilege may gain access to out-of-bounds memory, leading to a system integrity and confidentiality threat.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| linux · Debian 12.15 (bookworm) | 5.15.5-1 | DEBIAN-CVE-2021-4090 | Feb 18, 2022 |
| linux · Debian 13.5 (trixie) | 5.15.5-1 | DEBIAN-CVE-2021-4090 | Feb 18, 2022 |
| linux · Debian 14 | 5.15.5-1 | DEBIAN-CVE-2021-4090 | Feb 18, 2022 |
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