CVE-2026-98155: accel/qaic: Address potential out-of-bounds read in resp_worker()

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: 2026-09-25 · updated 2026-10-20
Weakness: CWE-125

Description

In the Linux kernel, the following vulnerability has been resolved: accel/qaic: Address potential out-of-bounds read in resp_worker() Although 'commit 2feec5ae5df7 ("accel/qaic: Handle DBC deactivation if the owner went away")' fixes the scenario it was intended for by walking the message and only decoding QAIC_TRANS_DEACTIVATE_FROM_DEV, if present, it skipped over the bounds checking code that is included in decode_message(). This could lead to issues such as reading past the slab allocation's end, infinite loops or kernel panics. For those issues to happen, a malformed wire message is needed to be sent from the device. Instead of duplicating the bounds checking code already present in decode_message(), use the function inside resp_worker().

Affected products

Linux kernel: from 6.6.134 before 6.6.158; from 6.12.81 before 6.12.111; from 6.18.22 before 6.18.53; from 6.19.12 before 6.20; 7.0, 7.0-rc1, 7.0-rc2, 7.0-rc3, 7.0-rc4, 7.0-rc5 (+2) — fixed in 6.12.111, 6.18.53, 6.20, 6.6.158

How to fix

Upgrade to a fixed version: Linux kernel 6.12.111, 6.18.53, 6.20, 6.6.158. Check the vendor advisory for mitigations.

References

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