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CVE-2026-68480: x86/bugs: Make Safe-RET robust against interrupt injection

• Severity: unknown
• 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: 2026-08-06 · updated 2026-08-18

Description

In the Linux kernel, the following vulnerability has been resolved: x86/bugs: Make Safe-RET robust against interrupt injection An attacker injecting interrupts while the Safe-RET mitigation executes on machines affected by SRSO can neutralize the safe return sequence, potentially leading to data leakage through speculative execution. Fixup register state as if the Safe-RET sequence executed successfully by "emulating" it, in a manner of speaking, and avoid executing a RET instruction after returning from the interrupt.

Affected products

• Linux kernel: from 5.10.189 before 5.10.264; from 5.15.125 before 5.15.215; from 6.1.44 before 6.1.182; from 6.4.9 before 6.5; 6.5 — fixed in 5.10.264, 5.15.215, 6.1.182, 6.5, 7.2

How to fix

Upgrade to a fixed version: Linux kernel 5.10.264, 5.15.215, 6.1.182, 6.5. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/52db77a13be224e09eb4ba6b4252ae8ab9085c2c
• https://git.kernel.org/stable/c/61649a2d61cb0dbc673f0f232f0f0c298bf50442
• https://git.kernel.org/stable/c/6703dba1d14cbd6647cd1ccfa3a3fa94b64dd096
• https://git.kernel.org/stable/c/7e7f81cf6f5ca3311e526308f55d7c54d3ba71f9
• https://git.kernel.org/stable/c/bfe7f9993467ba431b2731437949ac1e2634e771
• https://git.kernel.org/stable/c/d0208e08d64d99383e09852a76cc3038c5a4c3ab
• https://git.kernel.org/stable/c/dfefa3c51370f84acb643cddf98bb42c885d0483
• https://git.kernel.org/stable/c/e262f28a69ae9e0791248f93b0173c1d1f3e1d5d
• https://people.csail.mit.edu/mengjia/data/2026.USENIX.TONTOU.pdf

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