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CVE-2026-45957

7.1 · HIGH

In the Linux kernel, the following vulnerability has been resolved: rcu: Fix rcu_read_unlock() deadloop due to softirq Commit 5f5fa7ea89dc ("rcu: Don't use negative nesting depth in __rcu_read_un…

Published May 27, 2026CWE-125EPSS 0.17%

Overview

CVE-2026-45957 is a high-severity vulnerability. It was published on May 27, 2026 and has a CVSS 3.1 base score of 7.1 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.1, 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:

rcu: Fix rcu_read_unlock() deadloop due to softirq

Commit 5f5fa7ea89dc ("rcu: Don't use negative nesting depth in

__rcu_read_unlock()") removes the recursion-protection code from

__rcu_read_unlock(). Therefore, we could invoke the deadloop in

raise_softirq_irqoff() with ftrace enabled as follows:

WARNING: CPU: 0 PID: 0 at kernel/trace/trace.c:3021 __ftrace_trace_stack.constprop.0+0x172/0x180

Modules linked in: my_irq_work(O)

CPU: 0 UID: 0 PID: 0 Comm: swapper/0 Tainted: G O 6.18.0-rc7-dirty #23 PREEMPT(full)

Tainted: [O]=OOT_MODULE

Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.15.0-1 04/01/2014

RIP: 0010:__ftrace_trace_stack.constprop.0+0x172/0x180

RSP: 0018:ffffc900000034a8 EFLAGS: 00010002

RAX: 0000000000000000 RBX: 0000000000000004 RCX: 0000000000000000

RDX: 0000000000000003 RSI: ffffffff826d7b87 RDI: ffffffff826e9329

RBP: 0000000000090009 R08: 0000000000000005 R09: ffffffff82afbc4c

R10: 000000000

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/1f16679a5aa60238466ce339c35f5e82ece60337Refgit.kernel.org/stable/c/4a4a6e12c9c829be3f74b7206fa8640fc4e1c566Refgit.kernel.org/stable/c/979c708e6c9d7fc461daef2dad8b45f22e23464cRefgit.kernel.org/stable/c/c2932e16d8c354404b17123e64daa8e33191e145Refgit.kernel.org/stable/c/d41e37f26b3157b3f1d10223863519a943aa239b

How CyberStrike helps

Frequently asked questions

What is CVE-2026-45957?

CVE-2026-45957 is a high-severity vulnerability. It was published on May 27, 2026 and has a CVSS 3.1 base score of 7.1 (HIGH).

How severe is CVE-2026-45957?

This vulnerability has a CVSS 3.1 base score of 7.1, 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-2026-45957?

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-2026-45957?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-45957 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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