CVE-2026-89703

nfsd: set SC_STATUS_FREED in nfsd4_drop_revoked_stid for delegations

State: Published
Severity: 9.8 Critical
Published: Sep 11, 2026
Updated: Oct 19, 2026
Reserved: Sep 11, 2026

Description

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().

Scores

CVSS	Score	Vector	Source
3.1	9.8 Critical	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H	Linux

Weaknesses

The record names no weakness.

Affected Products

Product	Versions
LinuxLinux	8dd91e8d31febf4d9cca3ae1bb4771d33ae7ee5a to before d832a0587528853d45481d1faf75d4b5d062adafAffected 8dd91e8d31febf4d9cca3ae1bb4771d33ae7ee5a to before 1e4795766719ffd74b8cf0f2fde4a1350f8326bfAffected 8dd91e8d31febf4d9cca3ae1bb4771d33ae7ee5a to before a6d89032e5c6620d5bb44582a72555ce07bf1c2eAffected 8dd91e8d31febf4d9cca3ae1bb4771d33ae7ee5a to before 650d370cfbc66a96dd14d517bd704689b5bda4e5Affected 967faa26f313a62e7bebc55d5b8122eaee43b929Affected 6.11.6 to before 6.12Affected
LinuxLinux	6.12Affected before 6.12Not affected 6.12.109 through 6.12.Not affected 6.18.50 through 6.18.Not affected 7.2.4 through 7.2.*Not affected 7.3 and laterNot affected

Product

Versions

LinuxLinux

8dd91e8d31febf4d9cca3ae1bb4771d33ae7ee5a to before d832a0587528853d45481d1faf75d4b5d062adafAffected
8dd91e8d31febf4d9cca3ae1bb4771d33ae7ee5a to before 1e4795766719ffd74b8cf0f2fde4a1350f8326bfAffected
8dd91e8d31febf4d9cca3ae1bb4771d33ae7ee5a to before a6d89032e5c6620d5bb44582a72555ce07bf1c2eAffected
8dd91e8d31febf4d9cca3ae1bb4771d33ae7ee5a to before 650d370cfbc66a96dd14d517bd704689b5bda4e5Affected
967faa26f313a62e7bebc55d5b8122eaee43b929Affected
6.11.6 to before 6.12Affected

LinuxLinux

6.12Affected
before 6.12Not affected
6.12.109 through 6.12.*Not affected
6.18.50 through 6.18.*Not affected
7.2.4 through 7.2.*Not affected
7.3 and laterNot affected

References

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