CVE-2026-46273 (GCVE-0-2026-46273)

Vulnerability from cvelistv5 – Published: 2026-06-03 16:19 – Updated: 2026-06-14 18:05
VLAI
Title
ibmveth: Disable GSO for packets with small MSS
Summary
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).
Severity
8.6 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 8641dd85799f85bef5f0d1f87356aaa12cb2195e , < 86fc64584811d43c9ccd74447de58620189d8b77 (git)
Affected: 8641dd85799f85bef5f0d1f87356aaa12cb2195e , < 9a5e984d7af910e46dcbed3ce77873e000a4f77d (git)
Affected: 8641dd85799f85bef5f0d1f87356aaa12cb2195e , < 1cdf5dbcec988d06f5f720bdf89e91073f77fa10 (git)
Affected: 8641dd85799f85bef5f0d1f87356aaa12cb2195e , < 82bc89fbb82d9396fb4eaee8720ea85e2e787957 (git)
Affected: 8641dd85799f85bef5f0d1f87356aaa12cb2195e , < db8012c631cb845e9ae2b4b531e17d86c9519755 (git)
Affected: 8641dd85799f85bef5f0d1f87356aaa12cb2195e , < c1f261863e65b508f37416dfbc5c5d911c9b9233 (git)
Affected: 8641dd85799f85bef5f0d1f87356aaa12cb2195e , < 3af24f0c4c31f18a4a2d927990759194832bb6e9 (git)
Affected: 8641dd85799f85bef5f0d1f87356aaa12cb2195e , < cc427d24ac6442ffdeafd157a63c7c5b73ed4de4 (git)
Create a notification for this product.
Linux Linux Affected: 4.2
Unaffected: 0 , < 4.2 (semver)
Unaffected: 5.10.258 , ≤ 5.10.* (semver)
Unaffected: 5.15.209 , ≤ 5.15.* (semver)
Unaffected: 6.1.175 , ≤ 6.1.* (semver)
Unaffected: 6.6.140 , ≤ 6.6.* (semver)
Unaffected: 6.12.88 , ≤ 6.12.* (semver)
Unaffected: 6.18.30 , ≤ 6.18.* (semver)
Unaffected: 7.0.7 , ≤ 7.0.* (semver)
Unaffected: 7.1 , ≤ * (original_commit_for_fix)
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Show details on NVD website
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}


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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.