CVEvulnerability
CVE-2026-74495
9.8 CRITICAL
Official page ↗
- Status
- Received
- Published
- 2026-08-15
- Last modified
- 2026-10-16
- Assigner
- 416baaa9-dc9f-4396-8d5f-8c081fb06d67
- CVSS 3.1 (416baaa9-dc9f-4396-8d5f-8c081fb06d67)
- 9.8 CRITICAL — CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
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.
References
- https://git.kernel.org/stable/c/0565052b7e2f436b7f1541f4849da96dc0aa7a0e git.kernel.org
- https://git.kernel.org/stable/c/31089f4eab42e0fc248ec80c26f9b0bad59ba4cc git.kernel.org
- https://git.kernel.org/stable/c/56726ff12cb6759ab90d6f5332c2377aeca7d249 git.kernel.org
- https://git.kernel.org/stable/c/845a9cdd9b03b7b6fa8de3ee80579780350a7f65 git.kernel.org
- https://git.kernel.org/stable/c/bc25d56c03e41c10bc4b40e99ca5d7b941675c04 git.kernel.org
- https://git.kernel.org/stable/c/df07003b5a6c6c9fce60d765d6a3da815a74c41c git.kernel.org
- https://git.kernel.org/stable/c/e3ed89c257f6361f13df23023cd10ace830330ad git.kernel.org
- https://git.kernel.org/stable/c/e42b7225c45f57b42306b80cdd3bda202bae7293 git.kernel.org