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CVE-2026-74436

rxrpc: serialize kernel accept preallocation with socket teardown

Published
Last modified
published
Not listed in CISA KEV
Fix
Fixed in 5.10.266, 5.15.217, 6.1.184, 6.6.148, 6.12.101, and 2 more
None on Exploit-DB, Metasploit or GitHub
  • Exploitation: none
  • Automatable: yes
  • Technical impact: total

Summary

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.

Timeline

  1. CVE published
  2. CISA SSVC assessment

    Exploitation: none · Automatable: yes · Technical impact: total

  3. Record last updated

Affected versions

  • Linux Linux

    From 00e907127e6f86d0f9b122d9b4347a8aa09a8b61 · fixed in d6207326b4ca0ae1041281b6af9df53f8080669a; From 00e907127e6f86d0f9b122d9b4347a8aa09a8b61 · fixed in 11b429b84c87cb5a0152f14e7d6cb649ed363901; From 00e907127e6f86d0f9b122d9b4347a8aa09a8b61 · fixed in c20d983968f239574290cf804a58cde18ad1c559; From 00e907127e6f86d0f9b122d9b4347a8aa09a8b61 · fixed in 0337cdba0c477f176c0459bed012109453184573; From 00e907127e6f86d0f9b122d9b4347a8aa09a8b61 · fixed in dfa0b2bbc5e50119f89c6b5407faa5ed86dfa7c5; From 00e907127e6f86d0f9b122d9b4347a8aa09a8b61 · fixed in 35a967ff8b24db09ee429c39c5b5e6571639997d; From 00e907127e6f86d0f9b122d9b4347a8aa09a8b61 · fixed in 1741378a7a83dfd8e53a9196730df709b903cd33; From 00e907127e6f86d0f9b122d9b4347a8aa09a8b61 · fixed in dc175389b18c29a5303ee83169ec653adfae3e17

  • Linux Linux

    4.9

  • KernelLinux

    From 4.9.0 · fixed in 5.10.266; From 5.11.0 · fixed in 5.15.217; From 5.16.0 · fixed in 6.1.184; From 6.2.0 · fixed in 6.6.148; From 6.7.0 · fixed in 6.12.101; From 6.13.0 · fixed in 6.18.40; From 6.19.0 · fixed in 7.1.5

References 8

git.kernel.org