Answer in brief
CVE-2026-90151 records a Critical severity (CVSS 9.8) vulnerability in NFSv4: remove callback IDR entry on client allocation failure. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 9.8. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=f4eecd5da3422e82e88e36c33cbd2595eebcacb1 <68c721391b761dbe38d5b0094d2bb6e8489ad92b || >=f4eecd5da3422e82e88e36c33cbd2595eebcacb1 <9bfdd0f591307b5198826a0e7a5b2f35f87acd2d || >=f4eecd5da3422e82e88e36c33cbd2595eebcacb1 <7c4812eb96bdcafb31a65b12f2aa96659429d1d4 || >=f4eecd5da3422e82e88e36c33cbd2595eebcacb1 <fc95ca82d5ae598c428ab5a00ae69f8526d59371 || >=f4eecd5da3422e82e88e36c33cbd2595eebcacb1 <80b1c3d5a881f7d9081aa9f46da9742878a0f893 || >=f4eecd5da3422e82e88e36c33cbd2595eebcacb1 <3f2387e8bfbc4efda5d77c3a11a028d0a119c48f || >=f4eecd5da3422e82e88e36c33cbd2595eebcacb1 <5891c03e150920618db0e9c4ea2d772abacdcfd1 || >=f4eecd5da3422e82e88e36c33cbd2595eebcacb1 <d05c2007b3d84ccba11dc6e9cb3202768cc72f14 | 68c721391b761dbe38d5b0094d2bb6e8489ad92b, 9bfdd0f591307b5198826a0e7a5b2f35f87acd2d, 7c4812eb96bdcafb31a65b12f2aa96659429d1d4, fc95ca82d5ae598c428ab5a00ae69f8526d59371, 80b1c3d5a881f7d9081aa9f46da9742878a0f893, 3f2387e8bfbc4efda5d77c3a11a028d0a119c48f, 5891c03e150920618db0e9c4ea2d772abacdcfd1, d05c2007b3d84ccba11dc6e9cb3202768cc72f14 |
| Linux/Linuxgeneric | 2.6.38 | Not reported |
Published upstream
Sep 17, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Oct 19, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Sep 17, 2026
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.
Quoted source text, attributed separately from HOL analysis.