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CVE-2026-74646

7.8 · HIGH

In the Linux kernel, the following vulnerability has been resolved: misc: fastrpc: take fl->lock when moving mmaps on interrupted invoke When an invoke is interrupted by a signal, wait_for_comple…

Published Aug 22, 2026EPSS 0.18%

Overview

CVE-2026-74646 is a high-severity vulnerability. It was published on August 22, 2026 and has a CVSS 3.1 base score of 7.8 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.8, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

Technical description

In the Linux kernel, the following vulnerability has been resolved:

misc: fastrpc: take fl->lock when moving mmaps on interrupted invoke

When an invoke is interrupted by a signal,

wait_for_completion_interruptible() returns -ERESTARTSYS and

fastrpc_internal_invoke() moves every buffer from fl->mmaps onto

cctx->invoke_interrupted_mmaps. This list_del()/list_add_tail() walk

runs without holding fl->lock, the lock that serialises fl->mmaps in

fastrpc_req_mmap() and fastrpc_req_munmap() everywhere else.

Take fl->lock around the move, matching every other fl->mmaps accessor.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refgit.kernel.org/stable/c/3f265e405e5ef85030c3777262e18bb556bc8724Refgit.kernel.org/stable/c/a902fe1f80f58a2335b6be1131866f827ec44d1aRefgit.kernel.org/stable/c/af6345159abcbaa550518f31990d2a9558c2d369Refgit.kernel.org/stable/c/b85a0e91d7d6cd06a53c881a46f749cfcef416a2Refgit.kernel.org/stable/c/efd02f8d1a7449f15809bc18d3cd41aafea75d7e

How CyberStrike helps

Frequently asked questions

What is CVE-2026-74646?

CVE-2026-74646 is a high-severity vulnerability. It was published on August 22, 2026 and has a CVSS 3.1 base score of 7.8 (HIGH).

How severe is CVE-2026-74646?

This vulnerability has a CVSS 3.1 base score of 7.8, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2026-74646?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-74646?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-74646 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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