CVE-2026-74436
Description
In the Linux kernel, the following vulnerability has been resolved: rxrpc: serialize kernel accept preallocation with socket teardown rxrpc_kernel_charge_accept() reads rx->backlog without any socket/backlog synchronization and passes that raw pointer into rxrpc_service_prealloc_one(). A concurrent rxrpc_discard_prealloc() sets rx->backlog = NULL and frees the backlog rings, so a kernel preallocation worker can keep using a freed struct rxrpc_backlog while updating *_backlog_head/tail and array slots. Serialize the state check and backlog lookup with the socket lock, and reject kernel preallocation once teardown has disabled listening or discarded the service backlog.
How to fix
- Linux Linuxd6207326b4ca0ae1041281b6af9df53f8080669a, 11b429b84c87cb5a0152f14e7d6cb649ed363901, c20d983968f239574290cf804a58cde18ad1c559, 0337cdba0c477f176c0459bed012109453184573, dfa0b2bbc5e50119f89c6b5407faa5ed86dfa7c5, 35a967ff8b24db09ee429c39c5b5e6571639997d, 1741378a7a83dfd8e53a9196730df709b903cd33, dc175389b18c29a5303ee83169ec653adfae3e17 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| Linux Linux | 00e907127e6f86d0f9b122d9b4347a8aa09a8b61 ≤ v < d6207326b4ca0ae1041281b6af9df53f8080669a, 00e907127e6f86d0f9b122d9b4347a8aa09a8b61 ≤ v < 11b429b84c87cb5a0152f14e7d6cb649ed363901, 00e907127e6f86d0f9b122d9b4347a8aa09a8b61 ≤ v < c20d983968f239574290cf804a58cde18ad1c559, 00e907127e6f86d0f9b122d9b4347a8aa09a8b61 ≤ v < 0337cdba0c477f176c0459bed012109453184573, 00e907127e6f86d0f9b122d9b4347a8aa09a8b61 ≤ v < dfa0b2bbc5e50119f89c6b5407faa5ed86dfa7c5, 00e907127e6f86d0f9b122d9b4347a8aa09a8b61 ≤ v < 35a967ff8b24db09ee429c39c5b5e6571639997d, 00e907127e6f86d0f9b122d9b4347a8aa09a8b61 ≤ v < 1741378a7a83dfd8e53a9196730df709b903cd33, 00e907127e6f86d0f9b122d9b4347a8aa09a8b61 ≤ v < dc175389b18c29a5303ee83169ec653adfae3e17, 4.9 | d6207326b4ca0ae1041281b6af9df53f8080669a, 11b429b84c87cb5a0152f14e7d6cb649ed363901, c20d983968f239574290cf804a58cde18ad1c559, 0337cdba0c477f176c0459bed012109453184573, dfa0b2bbc5e50119f89c6b5407faa5ed86dfa7c5, 35a967ff8b24db09ee429c39c5b5e6571639997d, 1741378a7a83dfd8e53a9196730df709b903cd33, dc175389b18c29a5303ee83169ec653adfae3e17 |
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