What’s Vulnerable › Vulnerabilities

CVE-2026-68176: tracing: Fix mmiotrace possible NULL dereferencing of hiter->dev

• 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: 2026-08-10 · updated 2026-08-19

Description

In the Linux kernel, the following vulnerability has been resolved: tracing: Fix mmiotrace possible NULL dereferencing of hiter->dev If the mmio_pipe_open() fails to find a PCI device, the hiter->dev will be assigned to NULL. The mmiotrace read() function dereferences the hiter->dev if hiter exists. Change the test of the read to not only check hiter being NULL, but also the hiter->dev before dereferencing it.

Affected products

• Linux kernel: 2.6.27 — fixed in 7.2

How to fix

Upgrade to a fixed version: Linux kernel 7.2. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/0d5aaf91a3d05f7f993401af27872a5fc0f26edc
• https://git.kernel.org/stable/c/144f29e85702234b23d2a62abf723e6a17eb5427
• https://git.kernel.org/stable/c/201a01102c529772168181190cb084471082cf5c
• https://git.kernel.org/stable/c/3635a9e8b453e658a49b39d025f35bbc6e58d0e2
• https://git.kernel.org/stable/c/724cd84b0546c07806840fa658714488553d13a2
• https://git.kernel.org/stable/c/8464427e1c177809a9488a97dfa2807d9dcf323b
• https://git.kernel.org/stable/c/c06470320f8156306986a831010cdc9f9f87cb50
• https://git.kernel.org/stable/c/faaf95135184208ee3ac6f33175c8d1800669dfc

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