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CVE-2026-89694

UnknownEPSS 0.20%

Last modified

CVE-2026-89694 is a vulnerability of currently unknown severity. 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.. EPSS estimates a 0.20% chance of exploitation in the next 30 days.

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.

Metrics

EPSS Probability
0.20%

9.9th percentile

Probability of exploitation in the next 30 days. Learn more

Affected Software

Source: CNA advisory (CVE.org). NVD analysis pending.

VendorProductVersions
LinuxLinux>= ce0887ac96d35c7105090e166bb0807dc0a0e838, < 88daaed26e17e1c7e851859b5bbb4f0e1ab6d0e9; >= ce0887ac96d35c7105090e166bb0807dc0a0e838, < 81b2cfe767943922eca906a2a5af23a0ce5d0f35; >= ce0887ac96d35c7105090e166bb0807dc0a0e838, < 6bba72b8ee68ad631b94bd439592cba46de54d7d; >= ce0887ac96d35c7105090e166bb0807dc0a0e838, < 75268f6cfe26b09a7e4d3216367e87fe9e2a26aa; >= ce0887ac96d35c7105090e166bb0807dc0a0e838, < b1eca07303594ca27f5dc360a6946bd7e1f5b04c; >= ce0887ac96d35c7105090e166bb0807dc0a0e838, < b42dc26a14b4ad5d6daaada11ec4c70744141c25; >= ce0887ac96d35c7105090e166bb0807dc0a0e838, < d801906165cb5cc250d5cbe44935594e170be3e2; >= ce0887ac96d35c7105090e166bb0807dc0a0e838, < 6bdbfab96e0cf25e5f57dac5c09dc1749751a4bf
LinuxLinux5.6

References

Timeline

Published
Last Modified
Status
Received

Frequently Asked Questions

What is CVE-2026-89694?
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.
How severe is CVE-2026-89694?
Severity scoring for CVE-2026-89694 is pending analysis. The EPSS model estimates a 0.20% probability of exploitation in the next 30 days.
How do I fix CVE-2026-89694?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

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Source: NVD / NIST