nfsd: fix NULL dereference in nfs3svc_encode_getaclres
- Published
- Last modified
- Where the record stands: published, rejected by its publisher, or superseded by another id.What do these mean? →
- published
- Whether CISA lists it in its Known Exploited Vulnerabilities catalog: proof that attackers are using it.What do these mean? →
- Not listed in CISA KEV
- Fix
- Fix or patch referenced
- Whether working attack code is public (Exploit-DB, Metasploit, Nuclei or GitHub). Public code makes attacks easier.What do these mean? →
- None on Exploit-DB, Metasploit or GitHub
- Exploitation: none
- Automatable: no
- Technical impact: partial
Summary
In the Linux kernel, the following vulnerability has been resolved: nfsd: fix NULL dereference in nfs3svc_encode_getaclres In error cases the dentry may be NULL. Before 20798dfe249a, the encoder also checked dentry and d_really_is_positive(dentry), but that looks like overkill to me--zero status should be enough to guarantee a positive dentry. This isn't the first time we've seen an error-case NULL dereference hidden in the initialization of a local variable in an xdr encoder. But I went back through the other recent rewrites and didn't spot any similar bugs.
Timeline
- CVE published
- CISA SSVC assessment
Exploitation: none · Automatable: no · Technical impact: partial
- Record last updated
Affected versions
- Linux Linux
From d505e66191072748620fc0af038cea4e4da0e3cd · fixed in e79057d15d96ef19de4de6d7e479bae3d58a2a8d; From 20798dfe249a01ad1b12eec7dbc572db5003244a · fixed in 650e6f383a6eb40f7c0a010982a74ab4b6893870; From 20798dfe249a01ad1b12eec7dbc572db5003244a · fixed in ab1016d39cc052064e32f25ad18ef8767a0ee3b8
- Linux Linux
5.13