What’s Vulnerable › Vulnerabilities

CVE-2025-68376: coresight: ETR: Fix ETR buffer use-after-free issue

• 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: 2025-12-24 · updated 2026-10-21

Description

In the Linux kernel, the following vulnerability has been resolved: coresight: ETR: Fix ETR buffer use-after-free issue When ETR is enabled as CS_MODE_SYSFS, if the buffer size is changed and enabled again, currently sysfs_buf will point to the newly allocated memory(buf_new) and free the old memory(buf_old). But the etr_buf that is being used by the ETR remains pointed to buf_old, not updated to buf_new. In this case, it will result in a memory use-after-free issue. Fix this by checking ETR's mode before updating and releasing buf_old, if the mode is CS_MODE_SYSFS, then skip updating and releasing it.

Affected products

• Linux kernel: from 6.5.8 before 6.6; 6.6 — fixed in 6.19, 6.6

How to fix

Upgrade to a fixed version: Linux kernel 6.19, 6.6. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/35501ac3c7d40a7bb9568c2f89d6b56beaf9bed3
• https://git.kernel.org/stable/c/4e83434247ff8005a0b9a1ee997864abf8f259ec
• https://git.kernel.org/stable/c/5d5d130835b417c7bfd6c942f0149e34397d4463
• https://git.kernel.org/stable/c/70acbc9c77686b7a521af6d7a543dcd9c324cf07
• https://git.kernel.org/stable/c/cda077a19f5c8d6ec61e5b97deca203d95e3a422

Get alerted when CVE-2025-68376 or the next vulnerability affects your stack