by Kastro
Paper/Archive/CVE-2024-46690

CVE-2024-46690

Linux Linux — nfsd: fix nfsd4_deleg_getattr_conflict in presence of third party lease

EPSS 0.4%CVSS 9.8
critical.is priorityof 100
36
CVSS 9.8 (CNA)9.8 / 10 × 3029.4Not in CISA KEV+300.0EPSS percentile 34.3.343 × 206.9No public exploit+100.0SSVC exploitation: none+100.0
Description · from the CVE record

In the Linux kernel, the following vulnerability has been resolved: nfsd: fix nfsd4_deleg_getattr_conflict in presence of third party lease It is not safe to dereference fl->c.flc_owner without first confirming fl->fl_lmops is the expected manager. nfsd4_deleg_getattr_conflict() tests fl_lmops but largely ignores the result and assumes that flc_owner is an nfs4_delegation anyway. This is wrong. With this patch we restore the "!= &nfsd_lease_mng_ops" case to behave as it did before the change mentioned below. This is the same as the current code, but without any reference to a possible delegation.

Affected

ProductAffectedFixed inSource
Linuxc5967721e1063648b0506481585ba7e2e49a075e – < 1b46a871e980e3daa16fd5e77539966492e8910a1b46a871e980e3daa16fd5e77539966492e8910aCNA
Linuxc5967721e1063648b0506481585ba7e2e49a075e – < 40927f3d0972bf86357a32a5749be71a551241b640927f3d0972bf86357a32a5749be71a551241b6CNA
Linux6.96.10.8CNA

Scores by source

Linux (CNA)9.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CISA ADPSSVCExploitation: none · Automatable: no · Technical impact: partial

References

refgit.kernel.org/stable/c/1b46a871e980e3daa16fd5e77539966492e8910arefgit.kernel.org/stable/c/40927f3d0972bf86357a32a5749be71a551241b6