جزئیات آسیب‌پذیری

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().

• https://git.kernel.org/stable/c/d832a0587528853d45481d1faf75d4b5d062adaf
• https://git.kernel.org/stable/c/1e4795766719ffd74b8cf0f2fde4a1350f8326bf
• https://git.kernel.org/stable/c/a6d89032e5c6620d5bb44582a72555ce07bf1c2e
• https://git.kernel.org/stable/c/650d370cfbc66a96dd14d517bd704689b5bda4e5