# CVE-2026-89703

## Summary

- **CVE ID:** CVE-2026-89703
- **Severity:** CRITICAL
- **CVSS Score:** 9.8 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H)
- **CWE:** N/A
- **Published:** Sep 11, 2026
- **Last Modified:** Sep 13, 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().

## Affected Products

- Linux — Linux (8dd91e8d31febf4d9cca3ae1bb4771d33ae7ee5a)
- Linux — Linux (967faa26f313a62e7bebc55d5b8122eaee43b929)
- Linux — Linux (6.11.6)
- Linux — Linux (6.12)
- Linux — Linux (0)
- Linux — Linux (6.12.109)
- Linux — Linux (6.18.50)
- Linux — Linux (7.2.4)
- Linux — Linux (7.3-rc1)

## References

- [CNA](https://git.kernel.org/stable/c/d832a0587528853d45481d1faf75d4b5d062adaf)
- [CNA](https://git.kernel.org/stable/c/1e4795766719ffd74b8cf0f2fde4a1350f8326bf)
- [CNA](https://git.kernel.org/stable/c/a6d89032e5c6620d5bb44582a72555ce07bf1c2e)
- [CNA](https://git.kernel.org/stable/c/650d370cfbc66a96dd14d517bd704689b5bda4e5)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.61%
- **EPSS Percentile:** 47.6

---
_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-18._