CVE-2026-74495
In the Linux kernel, the following vulnerability has been resolved:
igbvf: Fix leak in TX 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 before each frag 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 (the head) would leak.
This bug was introduced by a 2010 fix for an endless loop in dma_error.
All other affected drivers have already been fixed.
CSIRTS triage
- What
- The igbvf Ethernet driver does not properly clean up DMA memory on transmit error paths, causing a resource leak.
- Who is affected
- Systems using Intel igbvf virtual function network adapters experiencing transmit errors.
- Urgency
- Low priority; CVSS 2.5 indicates minimal impact and no active exploitation.
- Action
- Apply Linux kernel patch addressing CVE-2026-74495 when available.
AI-assisted analysis generated from the source advisory — verify against the original.
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Exploitation outlook
- Low exploitation risk0.51% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 41% of all EPSS-scored CVEs.
Advisory coverage (2)
- criticalCVE-2026-74495: In the Linux kernel, the following vulnerability has been resolved: igbvf: Fix leak in TX DMA …nvd · 2026-08-15
- lowCVE-2026-74495: igbvf: Fix leak in TX DMA error cleanupmsrc · 2026-08-11
External references
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