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CVE-2026-74436

CRITICALCVSS 9.8/10EPSS 0.36%

Last modified

CVE-2026-74436 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. 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.. EPSS estimates a 0.36% chance of exploitation in the next 30 days.

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.

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

EPSS Probability
0.36%

29.7th percentile

Probability of exploitation in the next 30 days. Learn more

Affected Software

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

VendorProductVersions
LinuxLinux>= 00e907127e6f86d0f9b122d9b4347a8aa09a8b61, < d6207326b4ca0ae1041281b6af9df53f8080669a; >= 00e907127e6f86d0f9b122d9b4347a8aa09a8b61, < 11b429b84c87cb5a0152f14e7d6cb649ed363901; >= 00e907127e6f86d0f9b122d9b4347a8aa09a8b61, < c20d983968f239574290cf804a58cde18ad1c559; >= 00e907127e6f86d0f9b122d9b4347a8aa09a8b61, < 0337cdba0c477f176c0459bed012109453184573; >= 00e907127e6f86d0f9b122d9b4347a8aa09a8b61, < dfa0b2bbc5e50119f89c6b5407faa5ed86dfa7c5; >= 00e907127e6f86d0f9b122d9b4347a8aa09a8b61, < 35a967ff8b24db09ee429c39c5b5e6571639997d; >= 00e907127e6f86d0f9b122d9b4347a8aa09a8b61, < 1741378a7a83dfd8e53a9196730df709b903cd33; >= 00e907127e6f86d0f9b122d9b4347a8aa09a8b61, < dc175389b18c29a5303ee83169ec653adfae3e17
LinuxLinux4.9

References

Timeline

Published
Last Modified
Status
Received

Frequently Asked Questions

What is CVE-2026-74436?
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 severe is CVE-2026-74436?
CVE-2026-74436 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 0.36% probability of exploitation in the next 30 days.
How do I fix CVE-2026-74436?
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