Description
In the Linux kernel, the following vulnerability has been resolved:
openvswitch: fix GSO userspace truncation underflow
OVS_ACTION_ATTR_TRUNC currently stores a delta from the original skb length in OVS_CB(skb)->cutlen. When a later userspace action segments a GSO skb, queue_gso_packets() reuses that delta for each smaller segment. A segment can then reach queue_userspace_packet() with cutlen greater than skb->len, underflowing the length passed to skb_zerocopy().
Store the maximum preserved length instead and bound each consumer against the current skb length. Use U32_MAX as the no-truncation sentinel so the value remains valid if skb geometry changes before a consumer handles it.
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:HWeakness enumeration
Affected software
Source: the vendor's advisory (CNA). NVD analysis pending.
| Vendor | Product | Versions |
|---|---|---|
| Linux | Linux | >= f2a4d086ed4c588d32fe9b7aa67fead7280e7bf1, < 50a6a85f3d6b1d22d8436848606cdef5d2c490b4; >= f2a4d086ed4c588d32fe9b7aa67fead7280e7bf1, < 2623c48cc3a8da9a1886fd8f65c0e348f4406fd6; >= f2a4d086ed4c588d32fe9b7aa67fead7280e7bf1, < e211b081901ffca76674082c73eeaed53524c369; >= f2a4d086ed4c588d32fe9b7aa67fead7280e7bf1, < a16eaaf7c0b0ccdef6166707d90ffbc6eebf6855; >= f2a4d086ed4c588d32fe9b7aa67fead7280e7bf1, < fbfa3ad2ad6f3a5624aba5211c46290fb98cc9dc; >= f2a4d086ed4c588d32fe9b7aa67fead7280e7bf1, < 100a23b1613e9218e0af654ef102352c713f0263; >= f2a4d086ed4c588d32fe9b7aa67fead7280e7bf1, < ea85dbcbe8d4056ecb54352f97743d138ea4c407; >= f2a4d086ed4c588d32fe9b7aa67fead7280e7bf1, < 4032f8ed10fcb84d41c508dfb04be96589f78dfe |
| Linux | Linux | 4.8 |
References
- https://git.kernel.org/stable/c/100a23b1613e9218e0af654ef102352c713f0263
- https://git.kernel.org/stable/c/2623c48cc3a8da9a1886fd8f65c0e348f4406fd6
- https://git.kernel.org/stable/c/4032f8ed10fcb84d41c508dfb04be96589f78dfe
- https://git.kernel.org/stable/c/50a6a85f3d6b1d22d8436848606cdef5d2c490b4
- https://git.kernel.org/stable/c/a16eaaf7c0b0ccdef6166707d90ffbc6eebf6855
- https://git.kernel.org/stable/c/e211b081901ffca76674082c73eeaed53524c369
- https://git.kernel.org/stable/c/ea85dbcbe8d4056ecb54352f97743d138ea4c407
- https://git.kernel.org/stable/c/fbfa3ad2ad6f3a5624aba5211c46290fb98cc9dc
Timeline
- Published
- Aug 10, 2026
- Last modified
- Oct 19, 2026
- NVD status
- Received