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CVE-2026-23071: regmap: Fix race condition in hwspinlock irqsave routine

• Severity: medium (CVSS 4.7 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.1% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-02-04 · updated 2026-10-19
• Weakness: CWE-362

Description

In the Linux kernel, the following vulnerability has been resolved: regmap: Fix race condition in hwspinlock irqsave routine Previously, the address of the shared member '&map->spinlock_flags' was passed directly to 'hwspin_lock_timeout_irqsave'. This creates a race condition where multiple contexts contending for the lock could overwrite the shared flags variable, potentially corrupting the state for the current lock owner. Fix this by using a local stack variable 'flags' to store the IRQ state temporarily.

Affected products

• Linux kernel: from 4.15 before 5.10.249; from 5.11 before 5.15.199; from 5.16 before 6.1.162; from 6.2 before 6.6.122; from 6.7 before 6.12.68; from 6.13 before 6.18.8 — fixed in 5.10.249, 5.15.199, 6.1.162, 6.12.68, 6.18.8, 6.6.122

How to fix

Upgrade to a fixed version: Linux kernel 5.10.249, 5.15.199, 6.1.162, 6.12.68. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/24f31be6ad70537fd7706269d99c92cade465a09
• https://git.kernel.org/stable/c/4aab0ca0a0f7760e33edcb4e47576064d05128f5
• https://git.kernel.org/stable/c/4b58aac989c1e3fafb1c68a733811859df388250
• https://git.kernel.org/stable/c/766e243ae8c8b27087a4cc605752c0d5ee2daeab
• https://git.kernel.org/stable/c/c2d2cf710dc3ee1a69e00b4ed8de607a92a07889
• https://git.kernel.org/stable/c/e1a7072bc4f958c9e852dc7e57e39f12b0bb44b5
• https://git.kernel.org/stable/c/f1e2fe26a51eca95b41420af76d22c2e613efd5e

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