CVE-2026-90151NFSv4: remove callback IDR entry on client allocation failure
Updated under an hour ago ()
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No exploitation reported and no EPSS estimate yet.
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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.
- CVSS
- 9.8 CRITICAL (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Received
- Record last updated
- Sep 18, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Linux Linux linux:linux (from the name) | from f4eecd5da3422e82e88e36c33cbd2595eebcacb1 before 68c721391b761dbe38d5b0094d2bb6e8489ad92b; from f4eecd5da3422e82e88e36c33cbd2595eebcacb1 before 9bfdd0f591307b5198826a0e7a5b2f35f87acd2d; from f4eecd5da3422e82e88e36c33cbd2595eebcacb1 before 7c4812eb96bdcafb31a65b12f2aa96659429d1d4; from f4eecd5da3422e82e88e36c33cbd2595eebcacb1 before fc95ca82d5ae598c428ab5a00ae69f8526d59371; from f4eecd5da3422e82e88e36c33cbd2595eebcacb1 before 80b1c3d5a881f7d9081aa9f46da9742878a0f893; from f4eecd5da3422e82e88e36c33cbd2595eebcacb1 before 3f2387e8bfbc4efda5d77c3a11a028d0a119c48f; from f4eecd5da3422e82e88e36c33cbd2595eebcacb1 before 5891c03e150920618db0e9c4ea2d772abacdcfd1; from f4eecd5da3422e82e88e36c33cbd2595eebcacb1 before d05c2007b3d84ccba11dc6e9cb3202768cc72f14 | CNA record |
References
- https://git.kernel.org/stable/c/68c721391b761dbe38d5b0094d2bb6e8489ad92b
- https://git.kernel.org/stable/c/9bfdd0f591307b5198826a0e7a5b2f35f87acd2d
- https://git.kernel.org/stable/c/7c4812eb96bdcafb31a65b12f2aa96659429d1d4
- https://git.kernel.org/stable/c/fc95ca82d5ae598c428ab5a00ae69f8526d59371
- https://git.kernel.org/stable/c/80b1c3d5a881f7d9081aa9f46da9742878a0f893
- https://git.kernel.org/stable/c/3f2387e8bfbc4efda5d77c3a11a028d0a119c48f
- https://git.kernel.org/stable/c/5891c03e150920618db0e9c4ea2d772abacdcfd1
- https://git.kernel.org/stable/c/d05c2007b3d84ccba11dc6e9cb3202768cc72f14
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.