ibmveth: Disable GSO for packets with small MSS

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Summary

CVECVE-2026-46273
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-06-03 18:16:29 UTC
Updated2026-06-03 18:16:29 UTC
DescriptionIn 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).

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 8641dd85799f85bef5f0d1f87356aaa12cb2195e 86fc64584811d43c9ccd74447de58620189d8b77 git Not specified
CNA Linux Linux affected 8641dd85799f85bef5f0d1f87356aaa12cb2195e 9a5e984d7af910e46dcbed3ce77873e000a4f77d git Not specified
CNA Linux Linux affected 8641dd85799f85bef5f0d1f87356aaa12cb2195e 1cdf5dbcec988d06f5f720bdf89e91073f77fa10 git Not specified
CNA Linux Linux affected 8641dd85799f85bef5f0d1f87356aaa12cb2195e 82bc89fbb82d9396fb4eaee8720ea85e2e787957 git Not specified
CNA Linux Linux affected 8641dd85799f85bef5f0d1f87356aaa12cb2195e db8012c631cb845e9ae2b4b531e17d86c9519755 git Not specified
CNA Linux Linux affected 8641dd85799f85bef5f0d1f87356aaa12cb2195e c1f261863e65b508f37416dfbc5c5d911c9b9233 git Not specified
CNA Linux Linux affected 8641dd85799f85bef5f0d1f87356aaa12cb2195e 3af24f0c4c31f18a4a2d927990759194832bb6e9 git Not specified
CNA Linux Linux affected 8641dd85799f85bef5f0d1f87356aaa12cb2195e cc427d24ac6442ffdeafd157a63c7c5b73ed4de4 git Not specified
CNA Linux Linux affected 4.2 Not specified
CNA Linux Linux unaffected 4.2 semver Not specified
CNA Linux Linux unaffected 5.10.258 5.10.* semver Not specified
CNA Linux Linux unaffected 5.15.209 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.175 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.140 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.88 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.30 6.18.* semver Not specified
CNA Linux Linux unaffected 7.0.7 7.0.* semver Not specified
CNA Linux Linux unaffected 7.1-rc2 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/1cdf5dbcec988d06f5f720bdf89e91073f77fa10 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/db8012c631cb845e9ae2b4b531e17d86c9519755 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/3af24f0c4c31f18a4a2d927990759194832bb6e9 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/cc427d24ac6442ffdeafd157a63c7c5b73ed4de4 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/82bc89fbb82d9396fb4eaee8720ea85e2e787957 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/c1f261863e65b508f37416dfbc5c5d911c9b9233 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/86fc64584811d43c9ccd74447de58620189d8b77 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/9a5e984d7af910e46dcbed3ce77873e000a4f77d 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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