CVE-2026-89703

Summary

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().

Affected Software

VendorProductVersion RangeStatus
LinuxLinux8dd91e8d31febf4d9cca3ae1bb4771d33ae7ee5a < d832a0587528853d45481d1faf75d4b5d062adafaffected
LinuxLinux8dd91e8d31febf4d9cca3ae1bb4771d33ae7ee5a < 1e4795766719ffd74b8cf0f2fde4a1350f8326bfaffected
LinuxLinux8dd91e8d31febf4d9cca3ae1bb4771d33ae7ee5a < a6d89032e5c6620d5bb44582a72555ce07bf1c2eaffected
LinuxLinux8dd91e8d31febf4d9cca3ae1bb4771d33ae7ee5a < 650d370cfbc66a96dd14d517bd704689b5bda4e5affected
LinuxLinux967faa26f313a62e7bebc55d5b8122eaee43b929affected
LinuxLinux6.11.6 < 6.12affected
LinuxLinux6.12affected
LinuxLinux0 < 6.12unaffected
LinuxLinux6.12.109 <= 6.12.*unaffected
LinuxLinux6.18.50 <= 6.18.*unaffected
LinuxLinux7.2.4 <= 7.2.*unaffected
LinuxLinux7.3-rc1 <= *unaffected

Weaknesses

References