Answer in brief
CVE-2026-68123 records a Unknown severity 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). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
A CVSS score is not reported in the current record. 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). 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 |
Published upstream
Aug 10, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 10, 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.
Answer in brief
CVE-2026-68123 records a Unknown severity 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). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
A CVSS score is not reported in the current record. 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). 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 |
Published upstream
Aug 10, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 10, 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.