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CVE-2026-90156

UnknownEPSS 0.21%

Last modified

CVE-2026-90156 is a vulnerability of currently unknown severity. In the Linux kernel, the following vulnerability has been resolved: ksmbd: safely discard unregistered deferred locks When vfs_lock_file() defers a lock, smb2_lock() puts its ksmbd_lock on rollback_list before allocating and registering the asynchronous work. If either operation fails, rollback assumes that smb_lock->conn is initialized and dereferences NULL. The deferred file_lock also remains linked into the VFS blocked-lock state while it is freed. Keep the lock off rollback_list until async setup succeeds. EPSS estimates a 0.21% chance of exploitation in the next 30 days.

Description

In the Linux kernel, the following vulnerability has been resolved: ksmbd: safely discard unregistered deferred locks When vfs_lock_file() defers a lock, smb2_lock() puts its ksmbd_lock on rollback_list before allocating and registering the asynchronous work. If either operation fails, rollback assumes that smb_lock->conn is initialized and dereferences NULL. The deferred file_lock also remains linked into the VFS blocked-lock state while it is freed. Keep the lock off rollback_list until async setup succeeds. On setup failures, explicitly unblock and wake the deferred lock before freeing it and its ksmbd wrapper.

Metrics

EPSS Probability
0.21%

11.1th percentile

Probability of exploitation in the next 30 days. Learn more

Affected Software

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

VendorProductVersions
LinuxLinux>= e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9, < aaa51ac0d934cb4e2ab96e150fccc934e822009b; >= e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9, < ecdcfa15b3d799476c685cecd433ebefc93015c8; >= e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9, < 77413400f083a959724de6f36348c9677ef9873a; >= e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9, < 52b91bc5253bb83665f3ea70565d0b2487dae643; >= e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9, < d09af9a35ff7b77a950b507133d9092aadbfeff4; >= e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9, < 054bcca4cd9f00719b01f7108b51a2168fb94f15
LinuxLinux5.15

References

Timeline

Published
Last Modified
Status
Received

Frequently Asked Questions

What is CVE-2026-90156?
In the Linux kernel, the following vulnerability has been resolved: ksmbd: safely discard unregistered deferred locks When vfs_lock_file() defers a lock, smb2_lock() puts its ksmbd_lock on rollback_list before allocating and registering the asynchronous work. If either operation fails, rollback assumes that smb_lock->conn is initialized and dereferences NULL. The deferred file_lock also remains linked into the VFS blocked-lock state while it is freed. Keep the lock off rollback_list until async setup succeeds. On setup failures, explicitly unblock and wake the deferred lock before freeing it and its ksmbd wrapper.
How severe is CVE-2026-90156?
Severity scoring for CVE-2026-90156 is pending analysis. The EPSS model estimates a 0.21% probability of exploitation in the next 30 days.
How do I fix CVE-2026-90156?
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