Answer in brief
CVE-2026-68123 records a Critical severity (CVSS 9.8) vulnerability in openvswitch: fix GSO userspace truncation underflow. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 9.8. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=f2a4d086ed4c588d32fe9b7aa67fead7280e7bf1 <a16eaaf7c0b0ccdef6166707d90ffbc6eebf6855 || >=f2a4d086ed4c588d32fe9b7aa67fead7280e7bf1 <fbfa3ad2ad6f3a5624aba5211c46290fb98cc9dc || >=f2a4d086ed4c588d32fe9b7aa67fead7280e7bf1 <100a23b1613e9218e0af654ef102352c713f0263 || >=f2a4d086ed4c588d32fe9b7aa67fead7280e7bf1 <ea85dbcbe8d4056ecb54352f97743d138ea4c407 || >=f2a4d086ed4c588d32fe9b7aa67fead7280e7bf1 <4032f8ed10fcb84d41c508dfb04be96589f78dfe | a16eaaf7c0b0ccdef6166707d90ffbc6eebf6855, fbfa3ad2ad6f3a5624aba5211c46290fb98cc9dc, 100a23b1613e9218e0af654ef102352c713f0263, ea85dbcbe8d4056ecb54352f97743d138ea4c407, 4032f8ed10fcb84d41c508dfb04be96589f78dfe |
| Linux/Linuxgeneric | 4.8 | Not reported |
| Linux/Linuxgeneric | >=f2a4d086ed4c588d32fe9b7aa67fead7280e7bf1 <50a6a85f3d6b1d22d8436848606cdef5d2c490b4 || >=f2a4d086ed4c588d32fe9b7aa67fead7280e7bf1 <2623c48cc3a8da9a1886fd8f65c0e348f4406fd6 || >=f2a4d086ed4c588d32fe9b7aa67fead7280e7bf1 <e211b081901ffca76674082c73eeaed53524c369 || >=f2a4d086ed4c588d32fe9b7aa67fead7280e7bf1 <a16eaaf7c0b0ccdef6166707d90ffbc6eebf6855 || >=f2a4d086ed4c588d32fe9b7aa67fead7280e7bf1 <fbfa3ad2ad6f3a5624aba5211c46290fb98cc9dc || >=f2a4d086ed4c588d32fe9b7aa67fead7280e7bf1 <100a23b1613e9218e0af654ef102352c713f0263 || >=f2a4d086ed4c588d32fe9b7aa67fead7280e7bf1 <ea85dbcbe8d4056ecb54352f97743d138ea4c407 || >=f2a4d086ed4c588d32fe9b7aa67fead7280e7bf1 <4032f8ed10fcb84d41c508dfb04be96589f78dfe | 50a6a85f3d6b1d22d8436848606cdef5d2c490b4, 2623c48cc3a8da9a1886fd8f65c0e348f4406fd6, e211b081901ffca76674082c73eeaed53524c369, a16eaaf7c0b0ccdef6166707d90ffbc6eebf6855, fbfa3ad2ad6f3a5624aba5211c46290fb98cc9dc, 100a23b1613e9218e0af654ef102352c713f0263, ea85dbcbe8d4056ecb54352f97743d138ea4c407, 4032f8ed10fcb84d41c508dfb04be96589f78dfe |
Published upstream
Aug 10, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 19, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 10, 2026
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.
Quoted source text, attributed separately from HOL analysis.