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CVE-2026-74495

CRITICALCVSS 9.8/10EPSS 0.46%

Last modified

CVE-2026-74495 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. 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.. EPSS estimates a 0.46% chance of exploitation in the next 30 days.

Description

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.

Metrics

CVSS 3.1
9.8/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS Probability
0.46%

38.1th percentile

Probability of exploitation in the next 30 days. Learn more

Affected Software

Source: CNA advisory (CVE.org). NVD analysis pending.

VendorProductVersions
LinuxLinux>= c1fa347f20f17f14a4a1575727fa24340e8a9117, < e42b7225c45f57b42306b80cdd3bda202bae7293; >= c1fa347f20f17f14a4a1575727fa24340e8a9117, < e3ed89c257f6361f13df23023cd10ace830330ad; >= c1fa347f20f17f14a4a1575727fa24340e8a9117, < 56726ff12cb6759ab90d6f5332c2377aeca7d249; >= c1fa347f20f17f14a4a1575727fa24340e8a9117, < 31089f4eab42e0fc248ec80c26f9b0bad59ba4cc; >= c1fa347f20f17f14a4a1575727fa24340e8a9117, < bc25d56c03e41c10bc4b40e99ca5d7b941675c04; >= c1fa347f20f17f14a4a1575727fa24340e8a9117, < 845a9cdd9b03b7b6fa8de3ee80579780350a7f65; >= c1fa347f20f17f14a4a1575727fa24340e8a9117, < df07003b5a6c6c9fce60d765d6a3da815a74c41c; >= c1fa347f20f17f14a4a1575727fa24340e8a9117, < 0565052b7e2f436b7f1541f4849da96dc0aa7a0e
LinuxLinux2.6.33

References

Timeline

Published
Last Modified
Status
Received

Frequently Asked Questions

What is 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.
How severe is CVE-2026-74495?
CVE-2026-74495 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 0.46% probability of exploitation in the next 30 days.
How do I fix CVE-2026-74495?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

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Source: NVD / NIST