CVE-2026-74741
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved:
net: ngbe: fix NULL pointer dereference in non-MSI-X interrupt enabling
In non-MSI-X mode (such as legacy INTx or single MSI), wx->msix_entry is not allocated or initialized. Calling NGBE_INTR_MISC(wx) dereferences wx->msix_entry->entry, leading to a NULL pointer dereference crash.
This issue was introduced by fixing the IRQ vector when the number of
VFs is 7. Fix the issue by explicitly checking pdev->msix_enabled to
determine the correct vector index.
Additionally, as a side fix, set the interrupt mask to BIT(0) for the non-MSI-X fallback. In MSI/INTx mode, the MISC and queue interrupts share vector 0, and the WX_PX_MISC_IVAR register is only valid in the MSI-X case. Thus, BIT(0) is the correct mask for the miscellaneous cause when MSI-X is disabled.
Affected Software
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| Linux | Linux | 4174c0c331a2aa3322d3b3be532808deb041b37d < cef4c5b9aca24651d069adf9462b221df6a2a669 | affected |
| Linux | Linux | 4174c0c331a2aa3322d3b3be532808deb041b37d < 0ab482b2195edc000262f0eae1cdcb416b8f335d | affected |
| Linux | Linux | 4174c0c331a2aa3322d3b3be532808deb041b37d < 5f3a13e0bb5ebcc1ca2dfda42ea40b9f3c2be6ea | affected |
| Linux | Linux | 6.16 | affected |
| Linux | Linux | 0 < 6.16 | unaffected |
| Linux | Linux | 6.18.46 <= 6.18.* | unaffected |
| Linux | Linux | 7.1.10 <= 7.1.* | unaffected |
| Linux | Linux | 7.2 <= * | unaffected |
Weaknesses
References
- https://git.kernel.org/stable/c/cef4c5b9aca24651d069adf9462b221df6a2a669
- https://git.kernel.org/stable/c/0ab482b2195edc000262f0eae1cdcb416b8f335d
- https://git.kernel.org/stable/c/5f3a13e0bb5ebcc1ca2dfda42ea40b9f3c2be6ea
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