CVE-2025-39949

/// Technical description

In the Linux kernel, the following vulnerability has been resolved:

qed: Don't collect too many protection override GRC elements

In the protection override dump path, the firmware can return far too

many GRC elements, resulting in attempting to write past the end of the

previously-kmalloc'ed dump buffer.

This will result in a kernel panic with reason:

BUG: unable to handle kernel paging request at ADDRESS

where "ADDRESS" is just past the end of the protection override dump

buffer. The start address of the buffer is:

p_hwfn->cdev->dbg_features[DBG_FEATURE_PROTECTION_OVERRIDE].dump_buf

and the size of the buffer is buf_size in the same data structure.

The panic can be arrived at from either the qede Ethernet driver path:

[exception RIP: qed_grc_dump_addr_range+0x108]

qed_protection_override_dump at ffffffffc02662ed [qed]

qed_dbg_protection_override_dump at ffffffffc0267792 [qed]

qed_dbg_feature at ffffffffc026aa8f [qed]

qed_dbg_all_data at ffffffffc026b211 [qed]

qed_fw_

/// Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

/// References