CVE-2026-43445: e1000/e1000e: Fix leak in DMA error cleanup
In the Linux kernel, the following vulnerability has been resolved:
e1000/e1000e: Fix leak in DMA error cleanup
If an error is encountered while mapping TX buffers, the driver should unmap any buffers already mapped for that skb.
Because count is incremented after a successful mapping, it will always match the correct number of unmappings needed when dmaerror is reached. Decrementing count before the while loop in dmaerror causes an off-by-one error. If any mapping was successful before an unsuccessful mapping, exactly one DMA mapping would leak.
In these commits, a faulty while condition caused an infinite loop in dmaerror: Commit 03b1320dfcee ("e1000e: remove use of skbdmamap from e1000e driver") Commit 602c0554d7b0 ("e1000: remove use of skbdmamap from e1000 driver")
Commit c1fa347f20f1 ("e1000/e1000e/igb/igbvf/ixgb/ixgbe: Fix tests of unsigned in txmap()") fixed the infinite loop, but introduced the off-by-one error.
This issue may still exist in the igbvf driver, but I did not address it in this patch.
Affected Software
Remediation
Event History
Frequently Asked Questions
What is the severity of CVE-2026-43445?
CVE-2026-43445 has been classified as a moderate severity vulnerability.
How do I fix CVE-2026-43445?
To fix CVE-2026-43445, ensure your Linux kernel is updated to the latest version where the vulnerability is addressed.
Which Linux products are affected by CVE-2026-43445?
CVE-2026-43445 affects Linux e1000, e1000e, igb, igbvf, ixgb, and ixgbe products.
What does CVE-2026-43445 address?
CVE-2026-43445 addresses a DMA error cleanup issue in the e1000 and e1000e drivers.
Is CVE-2026-43445 a known vulnerability?
Yes, CVE-2026-43445 is a known vulnerability that has been documented and fixed in the Linux kernel.