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CVE-2025-37800: driver core: fix potential NULL pointer dereference in dev_uevent()

• Severity: medium (CVSS 5.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2025-05-08 · updated 2026-10-15
• Weakness: CWE-476

Description

In the Linux kernel, the following vulnerability has been resolved: driver core: fix potential NULL pointer dereference in dev_uevent() If userspace reads "uevent" device attribute at the same time as another threads unbinds the device from its driver, change to dev->driver from a valid pointer to NULL may result in crash. Fix this by using READ_ONCE() when fetching the pointer, and take bus' drivers klist lock to make sure driver instance will not disappear while we access it. Use WRITE_ONCE() when setting the driver pointer to ensure there is no tearing.

Affected products

• Linux kernel: before 6.6.89; from 6.7 before 6.12.26; from 6.13 before 6.14.5; 6.15-rc1, 6.15-rc2, 6.15-rc3 — fixed in 6.12.26, 6.14.5, 6.6.89

How to fix

Upgrade to a fixed version: Linux kernel 6.12.26, 6.14.5, 6.6.89. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/18daa52418e7e4629ed1703b64777294209d2622
• https://git.kernel.org/stable/c/2b344e779d9afd0fcb5ee4000e4d0fc7d8d867eb
• https://git.kernel.org/stable/c/3781e4b83e174364998855de777e184cf0b62c40
• https://git.kernel.org/stable/c/abe56be73eb10a677d16066f65ff9d30251f5eee

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