Linux Kernel e1000 Driver DMA Error Leak & Off-By-One
CVE-2026-43445 Published on May 8, 2026
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 dma_error is reached.
Decrementing count before the while loop in dma_error 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
dma_error:
Commit 03b1320dfcee ("e1000e: remove use of skb_dma_map from e1000e
driver")
Commit 602c0554d7b0 ("e1000: remove use of skb_dma_map from e1000 driver")
Commit c1fa347f20f1 ("e1000/e1000e/igb/igbvf/ixgb/ixgbe: Fix tests of
unsigned in *_tx_map()") 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.
Products Associated with CVE-2026-43445
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Affected Versions
Linux:- Version c1fa347f20f17f14a4a1575727fa24340e8a9117 and below 7eaeb778bfaa3b2a804f89321c234d59c74569db is affected.
- Version c1fa347f20f17f14a4a1575727fa24340e8a9117 and below 0606c24a745bafd1be5d66c48361638cd9cad74b is affected.
- Version c1fa347f20f17f14a4a1575727fa24340e8a9117 and below 519051c711dfd239ef6e4b28878efee400a035f9 is affected.
- Version c1fa347f20f17f14a4a1575727fa24340e8a9117 and below 0a1fc25deabab4efce64610e3c449485c4fa8f5f is affected.
- Version c1fa347f20f17f14a4a1575727fa24340e8a9117 and below fa5ba9867a55e640df0dc79bf0199770fb043f03 is affected.
- Version c1fa347f20f17f14a4a1575727fa24340e8a9117 and below 30e87ade8d678c25a8546cf38c0b498fa5cb27d3 is affected.
- Version c1fa347f20f17f14a4a1575727fa24340e8a9117 and below 10b5e65959e955a1c8894e0a5413944b5a70204a is affected.
- Version c1fa347f20f17f14a4a1575727fa24340e8a9117 and below e94eaef11142b01f77bf8ba4d0b59720b7858109 is affected.
- Version 2.6.33 is affected.
- Before 2.6.33 is unaffected.
- Version 5.10.253, <= 5.10.* is unaffected.
- Version 5.15.203, <= 5.15.* is unaffected.
- Version 6.1.167, <= 6.1.* is unaffected.
- Version 6.6.130, <= 6.6.* is unaffected.
- Version 6.12.78, <= 6.12.* is unaffected.
- Version 6.18.19, <= 6.18.* is unaffected.
- Version 6.19.9, <= 6.19.* is unaffected.
- Version 7.0, <= * is unaffected.