UBUNTU-CVE-2021-4090
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.
02 / AFFECTED SOFTWARE
Affected packages
2 explicit affected versions
29 explicit affected versions
2 explicit affected versions
4 explicit affected versions
7 explicit affected versions
33 explicit affected versions
38 explicit affected versions
13 explicit affected versions
10 explicit affected versions
10 explicit affected versions
10 explicit affected versions
21 explicit affected versions
6 explicit affected versions
13 explicit affected versions
11 explicit affected versions
2 explicit affected versions
2 explicit affected versions
3 explicit affected versions
23 explicit affected versions
5 explicit affected versions
11 explicit affected versions
44 explicit affected versions
4 explicit affected versions
4 explicit affected versions
9 explicit affected versions
12 explicit affected versions
12 explicit affected versions
7 explicit affected versions
5 explicit affected versions
16 explicit affected versions
43 explicit affected versions
7 explicit affected versions
11 explicit affected versions
6 explicit affected versions
11 explicit affected versions
50 explicit affected versions
12 explicit affected versions
03 / CONNECTIONS
Connected vulnerabilities
04 / EVIDENCE
Source records
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.
05 / REFERENCES
Further evidence
- https://bugzilla.redhat.com/show_bug.cgi?id=2025101
- https://git.kernel.org/linus/c0019b7db1d7ac62c711cda6b357a659d46428fe
- https://lore.kernel.org/linux-nfs/[email protected]/
- https://ubuntu.com/security/CVE-2021-4090
- https://ubuntu.com/security/notices/USN-5217-1
- https://ubuntu.com/security/notices/USN-5265-1
- https://ubuntu.com/security/notices/USN-5362-1
- https://www.cve.org/CVERecord?id=CVE-2021-4090