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CVE-2025-40358: riscv: stacktrace: Disable KASAN checks for non-current tasks

• Severity: high (CVSS 7.1 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: 2025-12-16 · updated 2026-10-14

Description

In the Linux kernel, the following vulnerability has been resolved: riscv: stacktrace: Disable KASAN checks for non-current tasks Unwinding the stack of a task other than current, KASAN would report "BUG: KASAN: out-of-bounds in walk_stackframe+0x41c/0x460" There is a same issue on x86 and has been resolved by the commit 84936118bdf3 ("x86/unwind: Disable KASAN checks for non-current tasks") The solution could be applied to RISC-V too. This patch also can solve the issue: https://seclists.org/oss-sec/2025/q4/23 [pjw@kernel.org: clean up checkpatch issues]

Affected products

• Linux kernel: 4.15 — fixed in 6.18

How to fix

Upgrade to a fixed version: Linux kernel 6.18. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/060ea84a484e852b52b938f234bf9b5503a6c910
• https://git.kernel.org/stable/c/27379fcc15a10d3e3780fe79ba3fc7ed1ccd78e2
• https://git.kernel.org/stable/c/2c8d2b53866fb229b438296526ef0fa5a990e5e5
• https://git.kernel.org/stable/c/ef4d626ac59a56f8ec5cc09c1fef26f2923eec6f
• https://git.kernel.org/stable/c/f34ba22989da61186f30a40b6a82e0b3337b96fc

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