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CVE-2026-43124: pstore: ram_core: fix incorrect success return when vmap() fails

• Severity: medium (CVSS 5.5 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: 2026-05-06 · updated 2026-06-17
• Weakness: CWE-476

Description

In the Linux kernel, the following vulnerability has been resolved: pstore: ram_core: fix incorrect success return when vmap() fails In persistent_ram_vmap(), vmap() may return NULL on failure. If offset is non-zero, adding offset_in_page(start) causes the function to return a non-NULL pointer even though the mapping failed. persistent_ram_buffer_map() therefore incorrectly returns success. Subsequent access to prz->buffer may dereference an invalid address and cause crashes. Add proper NULL checking for vmap() failures.

Affected products

• Linux kernel: from 3.16.62 before 5.10.252; from 5.11 before 5.15.202; from 5.16 before 6.1.165; from 6.2 before 6.6.128; from 6.7 before 6.12.75; from 6.13 before 6.18.16 — fixed in 5.10.252, 5.15.202, 6.1.165, 6.12.75, 6.18.16, 6.19.6

How to fix

Upgrade to a fixed version: Linux kernel 5.10.252, 5.15.202, 6.1.165, 6.12.75. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/05363abc7625cf18c96e67f50673cd07f11da5e9
• https://git.kernel.org/stable/c/1da904e84de608907662ad8a51ba9c571d61e003
• https://git.kernel.org/stable/c/2c99326dc1c79b7ce3c8dd92929b5ce724ff70eb
• https://git.kernel.org/stable/c/49918dd52615097529811d21ec6074dd02ebe77c
• https://git.kernel.org/stable/c/88d5b28f63c7aac1271784e3b800ed405d1cde75
• https://git.kernel.org/stable/c/8baa234181f632cabacf73e4834a910859e9fcc9
• https://git.kernel.org/stable/c/8d849adfbc3e98417fb541620568db1a759ef441
• https://git.kernel.org/stable/c/d47234840aeb4182ed3ee795c578b1dfa9cbd25b

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