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CVE-2026-90151

CRITICALCVSS 9.8/10

Last modified

CVE-2026-90151 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. In the Linux kernel, the following vulnerability has been resolved: NFSv4: remove callback IDR entry on client allocation failure nfs4_alloc_client() allocates an NFSv4.0 callback identifier before it finishes setting up the client. If any later initialization step fails, the error path frees the nfs_client directly with nfs_free_client().

Description

In the Linux kernel, the following vulnerability has been resolved: NFSv4: remove callback IDR entry on client allocation failure nfs4_alloc_client() allocates an NFSv4.0 callback identifier before it finishes setting up the client. If any later initialization step fails, the error path frees the nfs_client directly with nfs_free_client(). That bypasses nfs_put_client(), which is where the callback IDR entry is removed during normal teardown. A failed allocation can therefore leave cb_ident_idr pointing at a freed nfs_client. A later NFSv4.0 callback lookup by cb_ident would find the stale pointer and take a reference to it. Make the callback IDR removal helper callable by the allocation failure path, and remove the callback identifier before freeing the client. This was found by a local static-analysis checker for publish-before-free lifetime bugs and confirmed by manual inspection.

Metrics

CVSS 3.1
9.8/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected Software

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

VendorProductVersions
LinuxLinux>= f4eecd5da3422e82e88e36c33cbd2595eebcacb1, < 68c721391b761dbe38d5b0094d2bb6e8489ad92b; >= f4eecd5da3422e82e88e36c33cbd2595eebcacb1, < 9bfdd0f591307b5198826a0e7a5b2f35f87acd2d; >= f4eecd5da3422e82e88e36c33cbd2595eebcacb1, < 7c4812eb96bdcafb31a65b12f2aa96659429d1d4; >= f4eecd5da3422e82e88e36c33cbd2595eebcacb1, < fc95ca82d5ae598c428ab5a00ae69f8526d59371; >= f4eecd5da3422e82e88e36c33cbd2595eebcacb1, < 80b1c3d5a881f7d9081aa9f46da9742878a0f893; >= f4eecd5da3422e82e88e36c33cbd2595eebcacb1, < 3f2387e8bfbc4efda5d77c3a11a028d0a119c48f; >= f4eecd5da3422e82e88e36c33cbd2595eebcacb1, < 5891c03e150920618db0e9c4ea2d772abacdcfd1; >= f4eecd5da3422e82e88e36c33cbd2595eebcacb1, < d05c2007b3d84ccba11dc6e9cb3202768cc72f14
LinuxLinux2.6.38

References

Timeline

Published
Last Modified
Status
Received

Frequently Asked Questions

What is CVE-2026-90151?
In the Linux kernel, the following vulnerability has been resolved: NFSv4: remove callback IDR entry on client allocation failure nfs4_alloc_client() allocates an NFSv4.0 callback identifier before it finishes setting up the client. If any later initialization step fails, the error path frees the nfs_client directly with nfs_free_client(). That bypasses nfs_put_client(), which is where the callback IDR entry is removed during normal teardown. A failed allocation can therefore leave cb_ident_idr pointing at a freed nfs_client. A later NFSv4.0 callback lookup by cb_ident would find the stale pointer and take a reference to it. Make the callback IDR removal helper callable by the allocation failure path, and remove the callback identifier before freeing the client. This was found by a local static-analysis checker for publish-before-free lifetime bugs and confirmed by manual inspection.
How severe is CVE-2026-90151?
CVE-2026-90151 has a CVSS score of 9.8/10 (CRITICAL severity).
How do I fix CVE-2026-90151?
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