Vulnerability in Linux

CVE-2026-89703

In the Linux kernel, the following vulnerability has been resolved: nfsd: set SC_STATUS_FREED in nfsd4_drop_revoked_stid for delegations nfsd4_drop_revoked_stid() handles FREE_STATEID for admin-revoked delegations but does not set SC_STATUS_FREED before releasing cl_lock. revoke_delegation() uses this flag to detect whether FREE_STATEID has already processed the delegation -- without it, the freed delegation is added to cl_revoked via list_add(), producing a use-after-free when cl_revoked is later traversed in __destroy_client(). The SC_STATUS_REVOKED path in nfsd4_free_stateid() (line 7983) already sets SC_STATUS_FREED correctly. Apply the same pattern to the SC_STATUS_ADMIN_REVOKED path in nfsd4_drop_revoked_stid().

Published · last modified .

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.006 (49.3th percentile), scored .

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 49th percentile — 49.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS trend (30 days)EPSS over the last 30 days for CVE-2026-89703: held from 0.007 to 0.006.

EPSS over last 30 days · oldest: 0.007 · newest: 0.006 · change: -0.000

Affected products

  • Linux — versions 6.12, 967faa26f313a62e7bebc55d5b8122eaee43b929

References

Frequently asked questions

What is CVE-2026-89703?
CVE-2026-89703 is a critical-severity vulnerability in Linux. CVSS score: 9.8/10. Published 2026-09-11.
How severe is CVE-2026-89703?
Critical severity. CVSS v3 base score is 9.8 out of 10.