CVE-2026-89694

nfsd: check client ownership when cancelling a copy-notify stateid

State: Published
Severity: Not scored
Published: Sep 11, 2026
Updated: Oct 19, 2026
Reserved: Sep 11, 2026

Description

In the Linux kernel, the following vulnerability has been resolved:

nfsd: check client ownership when cancelling a copy-notify stateid

On the OFFLOAD_CANCEL path (clp != NULL), manage_cpntf_state() freed the target cpntf state without checking ownership. The lookup key st->si_opaque.so_id is allocated cyclically (guessable) and the embedded clientid is the fixed per-net nn->s2s_cp_cl_id, so any authenticated NFSv4.2 client could cancel and free another client's copy-notify stateid.

Compare the creating clientid recorded in state->cp_p_clid against the requesting client's cl_clientid and return nfserr_bad_stateid on a mismatch instead of freeing the entry.

Scores

The record has no CVSS score.

Weaknesses

The record names no weakness.

Affected Products

Product	Versions
LinuxLinux	ce0887ac96d35c7105090e166bb0807dc0a0e838 to before 88daaed26e17e1c7e851859b5bbb4f0e1ab6d0e9Affected ce0887ac96d35c7105090e166bb0807dc0a0e838 to before 81b2cfe767943922eca906a2a5af23a0ce5d0f35Affected ce0887ac96d35c7105090e166bb0807dc0a0e838 to before 6bba72b8ee68ad631b94bd439592cba46de54d7dAffected ce0887ac96d35c7105090e166bb0807dc0a0e838 to before 75268f6cfe26b09a7e4d3216367e87fe9e2a26aaAffected ce0887ac96d35c7105090e166bb0807dc0a0e838 to before b1eca07303594ca27f5dc360a6946bd7e1f5b04cAffected ce0887ac96d35c7105090e166bb0807dc0a0e838 to before b42dc26a14b4ad5d6daaada11ec4c70744141c25Affected ce0887ac96d35c7105090e166bb0807dc0a0e838 to before d801906165cb5cc250d5cbe44935594e170be3e2Affected ce0887ac96d35c7105090e166bb0807dc0a0e838 to before 6bdbfab96e0cf25e5f57dac5c09dc1749751a4bfAffected
LinuxLinux	5.6Affected before 5.6Not affected 5.10.270 through 5.10.Not affected 5.15.221 through 5.15.Not affected 6.1.188 through 6.1.Not affected 6.6.157 through 6.6.Not 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

ce0887ac96d35c7105090e166bb0807dc0a0e838 to before 88daaed26e17e1c7e851859b5bbb4f0e1ab6d0e9Affected
ce0887ac96d35c7105090e166bb0807dc0a0e838 to before 81b2cfe767943922eca906a2a5af23a0ce5d0f35Affected
ce0887ac96d35c7105090e166bb0807dc0a0e838 to before 6bba72b8ee68ad631b94bd439592cba46de54d7dAffected
ce0887ac96d35c7105090e166bb0807dc0a0e838 to before 75268f6cfe26b09a7e4d3216367e87fe9e2a26aaAffected
ce0887ac96d35c7105090e166bb0807dc0a0e838 to before b1eca07303594ca27f5dc360a6946bd7e1f5b04cAffected
ce0887ac96d35c7105090e166bb0807dc0a0e838 to before b42dc26a14b4ad5d6daaada11ec4c70744141c25Affected
ce0887ac96d35c7105090e166bb0807dc0a0e838 to before d801906165cb5cc250d5cbe44935594e170be3e2Affected
ce0887ac96d35c7105090e166bb0807dc0a0e838 to before 6bdbfab96e0cf25e5f57dac5c09dc1749751a4bfAffected

LinuxLinux

5.6Affected
before 5.6Not affected
5.10.270 through 5.10.*Not affected
5.15.221 through 5.15.*Not affected
6.1.188 through 6.1.*Not affected
6.6.157 through 6.6.*Not 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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