Answer in brief
CVE-2026-46273 records a High severity (CVSS 8.6) vulnerability in ibmveth: Disable GSO for packets with small MSS. 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.
CVSS is 8.6. 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.
| Product | Affected versions | Fixed versions |
|---|---|---|
| cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:o:linux:linux_kernel:7.1:rc1:*:*:*:*:*:* | Not reported | Not reported |
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=8641dd85799f85bef5f0d1f87356aaa12cb2195e <86fc64584811d43c9ccd74447de58620189d8b77 || >=8641dd85799f85bef5f0d1f87356aaa12cb2195e <9a5e984d7af910e46dcbed3ce77873e000a4f77d || >=8641dd85799f85bef5f0d1f87356aaa12cb2195e <1cdf5dbcec988d06f5f720bdf89e91073f77fa10 || >=8641dd85799f85bef5f0d1f87356aaa12cb2195e <82bc89fbb82d9396fb4eaee8720ea85e2e787957 || >=8641dd85799f85bef5f0d1f87356aaa12cb2195e <db8012c631cb845e9ae2b4b531e17d86c9519755 || >=8641dd85799f85bef5f0d1f87356aaa12cb2195e <c1f261863e65b508f37416dfbc5c5d911c9b9233 || >=8641dd85799f85bef5f0d1f87356aaa12cb2195e <3af24f0c4c31f18a4a2d927990759194832bb6e9 || >=8641dd85799f85bef5f0d1f87356aaa12cb2195e <cc427d24ac6442ffdeafd157a63c7c5b73ed4de4 | 86fc64584811d43c9ccd74447de58620189d8b77, 9a5e984d7af910e46dcbed3ce77873e000a4f77d, 1cdf5dbcec988d06f5f720bdf89e91073f77fa10, 82bc89fbb82d9396fb4eaee8720ea85e2e787957, db8012c631cb845e9ae2b4b531e17d86c9519755, c1f261863e65b508f37416dfbc5c5d911c9b9233, 3af24f0c4c31f18a4a2d927990759194832bb6e9, cc427d24ac6442ffdeafd157a63c7c5b73ed4de4 |
| Linux/Linuxgeneric | 4.2 | Not reported |
Published upstream
Jun 3, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 7, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 5, 2026
In the Linux kernel, the following vulnerability has been resolved: ibmveth: Disable GSO for packets with small MSS Some physical adapters on Power systems do not support segmentation offload when the MSS is less than 224 bytes. Attempting to send such packets causes the adapter to freeze, stopping all traffic until manually reset. Implement ndo_features_check to disable GSO for packets with small MSS values. The network stack will perform software segmentation instead. The 224-byte minimum matches ibmvnic commit <f10b09ef687f> ("ibmvnic: Enforce stronger sanity checks on GSO packets") which uses the same physical adapters in SEA configurations. The issue occurs specifically when the hardware attempts to perform segmentation (gso_segs > 1) with a small MSS. Single-segment GSO packets (gso_segs == 1) do not trigger the problematic LSO code path and are transmitted normally without segmentation. Add an ndo_features_check callback to disable GSO when MSS < 224 bytes. Also call vlan_features_check() to ensure proper handling of VLAN packets, particularly QinQ (802.1ad) configurations where the hardware parser may not support certain offload features. Validated using iptables to force small MSS values. Without the fix, the adapter freezes. With the fix, packets are segmented in software and transmission succeeds. Comprehensive regression testing completedd (MSS tests, performance, stability).
Quoted source text, attributed separately from HOL analysis.