{"api_version":"1","generated_at":"2026-06-04T13:01:13+00:00","cve":"CVE-2026-46273","urls":{"html":"https://cve.report/CVE-2026-46273","api":"https://cve.report/api/cve/CVE-2026-46273.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-46273","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-46273"},"summary":{"title":"ibmveth: Disable GSO for packets with small MSS","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nibmveth: Disable GSO for packets with small MSS\n\nSome physical adapters on Power systems do not support segmentation\noffload when the MSS is less than 224 bytes. Attempting to send such\npackets causes the adapter to freeze, stopping all traffic until\nmanually reset.\n\nImplement ndo_features_check to disable GSO for packets with small MSS\nvalues. The network stack will perform software segmentation instead.\n\nThe 224-byte minimum matches ibmvnic\ncommit <f10b09ef687f> (\"ibmvnic: Enforce stronger sanity checks\non GSO packets\")\nwhich uses the same physical adapters in SEA configurations.\n\nThe issue occurs specifically when the hardware attempts to perform\nsegmentation (gso_segs > 1) with a small MSS. Single-segment GSO packets\n(gso_segs == 1) do not trigger the problematic LSO code path and are\ntransmitted normally without segmentation.\n\nAdd an ndo_features_check callback to disable GSO when MSS < 224 bytes.\nAlso call vlan_features_check() to ensure proper handling of VLAN packets,\nparticularly QinQ (802.1ad) configurations where the hardware parser may\nnot support certain offload features.\n\nValidated using iptables to force small MSS values. Without the fix,\nthe adapter freezes. With the fix, packets are segmented in software\nand transmission succeeds. Comprehensive regression testing completedd\n(MSS tests, performance, stability).","state":"PUBLISHED","assigner":"Linux","published_at":"2026-06-03 18:16:29","updated_at":"2026-06-03 18:16:29"},"problem_types":[],"metrics":[],"references":[{"url":"https://git.kernel.org/stable/c/1cdf5dbcec988d06f5f720bdf89e91073f77fa10","name":"https://git.kernel.org/stable/c/1cdf5dbcec988d06f5f720bdf89e91073f77fa10","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/db8012c631cb845e9ae2b4b531e17d86c9519755","name":"https://git.kernel.org/stable/c/db8012c631cb845e9ae2b4b531e17d86c9519755","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/3af24f0c4c31f18a4a2d927990759194832bb6e9","name":"https://git.kernel.org/stable/c/3af24f0c4c31f18a4a2d927990759194832bb6e9","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/cc427d24ac6442ffdeafd157a63c7c5b73ed4de4","name":"https://git.kernel.org/stable/c/cc427d24ac6442ffdeafd157a63c7c5b73ed4de4","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/82bc89fbb82d9396fb4eaee8720ea85e2e787957","name":"https://git.kernel.org/stable/c/82bc89fbb82d9396fb4eaee8720ea85e2e787957","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/c1f261863e65b508f37416dfbc5c5d911c9b9233","name":"https://git.kernel.org/stable/c/c1f261863e65b508f37416dfbc5c5d911c9b9233","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/86fc64584811d43c9ccd74447de58620189d8b77","name":"https://git.kernel.org/stable/c/86fc64584811d43c9ccd74447de58620189d8b77","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/9a5e984d7af910e46dcbed3ce77873e000a4f77d","name":"https://git.kernel.org/stable/c/9a5e984d7af910e46dcbed3ce77873e000a4f77d","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-46273","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-46273","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 8641dd85799f85bef5f0d1f87356aaa12cb2195e 86fc64584811d43c9ccd74447de58620189d8b77 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 8641dd85799f85bef5f0d1f87356aaa12cb2195e 9a5e984d7af910e46dcbed3ce77873e000a4f77d git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 8641dd85799f85bef5f0d1f87356aaa12cb2195e 1cdf5dbcec988d06f5f720bdf89e91073f77fa10 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 8641dd85799f85bef5f0d1f87356aaa12cb2195e 82bc89fbb82d9396fb4eaee8720ea85e2e787957 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 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semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 5.15.209 5.15.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.1.175 6.1.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.6.140 6.6.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.12.88 6.12.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.18.30 6.18.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.0.7 7.0.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.1-rc2 * original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":null,"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"defaultStatus":"unaffected","product":"Linux","programFiles":["drivers/net/ethernet/ibm/ibmveth.c","drivers/net/ethernet/ibm/ibmveth.h"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"86fc64584811d43c9ccd74447de58620189d8b77","status":"affected","version":"8641dd85799f85bef5f0d1f87356aaa12cb2195e","versionType":"git"},{"lessThan":"9a5e984d7af910e46dcbed3ce77873e000a4f77d","status":"affected","version":"8641dd85799f85bef5f0d1f87356aaa12cb2195e","versionType":"git"},{"lessThan":"1cdf5dbcec988d06f5f720bdf89e91073f77fa10","status":"affected","version":"8641dd85799f85bef5f0d1f87356aaa12cb2195e","versionType":"git"},{"lessThan":"82bc89fbb82d9396fb4eaee8720ea85e2e787957","status":"affected","version":"8641dd85799f85bef5f0d1f87356aaa12cb2195e","versionType":"git"},{"lessThan":"db8012c631cb845e9ae2b4b531e17d86c9519755","status":"affected","version":"8641dd85799f85bef5f0d1f87356aaa12cb2195e","versionType":"git"},{"lessThan":"c1f261863e65b508f37416dfbc5c5d911c9b9233","status":"affected","version":"8641dd85799f85bef5f0d1f87356aaa12cb2195e","versionType":"git"},{"lessThan":"3af24f0c4c31f18a4a2d927990759194832bb6e9","status":"affected","version":"8641dd85799f85bef5f0d1f87356aaa12cb2195e","versionType":"git"},{"lessThan":"cc427d24ac6442ffdeafd157a63c7c5b73ed4de4","status":"affected","version":"8641dd85799f85bef5f0d1f87356aaa12cb2195e","versionType":"git"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["drivers/net/ethernet/ibm/ibmveth.c","drivers/net/ethernet/ibm/ibmveth.h"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"4.2"},{"lessThan":"4.2","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"5.10.*","status":"unaffected","version":"5.10.258","versionType":"semver"},{"lessThanOrEqual":"5.15.*","status":"unaffected","version":"5.15.209","versionType":"semver"},{"lessThanOrEqual":"6.1.*","status":"unaffected","version":"6.1.175","versionType":"semver"},{"lessThanOrEqual":"6.6.*","status":"unaffected","version":"6.6.140","versionType":"semver"},{"lessThanOrEqual":"6.12.*","status":"unaffected","version":"6.12.88","versionType":"semver"},{"lessThanOrEqual":"6.18.*","status":"unaffected","version":"6.18.30","versionType":"semver"},{"lessThanOrEqual":"7.0.*","status":"unaffected","version":"7.0.7","versionType":"semver"},{"lessThanOrEqual":"*","status":"unaffected","version":"7.1-rc2","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"5.10.258","versionStartIncluding":"4.2","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"5.15.209","versionStartIncluding":"4.2","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.1.175","versionStartIncluding":"4.2","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.6.140","versionStartIncluding":"4.2","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.12.88","versionStartIncluding":"4.2","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.18.30","versionStartIncluding":"4.2","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.0.7","versionStartIncluding":"4.2","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.1-rc2","versionStartIncluding":"4.2","vulnerable":true}],"negate":false,"operator":"OR"}]}],"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nibmveth: Disable GSO for packets with small MSS\n\nSome physical adapters on Power systems do not support segmentation\noffload when the MSS is less than 224 bytes. Attempting to send such\npackets causes the adapter to freeze, stopping all traffic until\nmanually reset.\n\nImplement ndo_features_check to disable GSO for packets with small MSS\nvalues. The network stack will perform software segmentation instead.\n\nThe 224-byte minimum matches ibmvnic\ncommit <f10b09ef687f> (\"ibmvnic: Enforce stronger sanity checks\non GSO packets\")\nwhich uses the same physical adapters in SEA configurations.\n\nThe issue occurs specifically when the hardware attempts to perform\nsegmentation (gso_segs > 1) with a small MSS. Single-segment GSO packets\n(gso_segs == 1) do not trigger the problematic LSO code path and are\ntransmitted normally without segmentation.\n\nAdd an ndo_features_check callback to disable GSO when MSS < 224 bytes.\nAlso call vlan_features_check() to ensure proper handling of VLAN packets,\nparticularly QinQ (802.1ad) configurations where the hardware parser may\nnot support certain offload features.\n\nValidated using iptables to force small MSS values. Without the fix,\nthe adapter freezes. With the fix, packets are segmented in software\nand transmission succeeds. Comprehensive regression testing completedd\n(MSS tests, performance, stability)."}],"providerMetadata":{"dateUpdated":"2026-06-03T16:19:18.056Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/86fc64584811d43c9ccd74447de58620189d8b77"},{"url":"https://git.kernel.org/stable/c/9a5e984d7af910e46dcbed3ce77873e000a4f77d"},{"url":"https://git.kernel.org/stable/c/1cdf5dbcec988d06f5f720bdf89e91073f77fa10"},{"url":"https://git.kernel.org/stable/c/82bc89fbb82d9396fb4eaee8720ea85e2e787957"},{"url":"https://git.kernel.org/stable/c/db8012c631cb845e9ae2b4b531e17d86c9519755"},{"url":"https://git.kernel.org/stable/c/c1f261863e65b508f37416dfbc5c5d911c9b9233"},{"url":"https://git.kernel.org/stable/c/3af24f0c4c31f18a4a2d927990759194832bb6e9"},{"url":"https://git.kernel.org/stable/c/cc427d24ac6442ffdeafd157a63c7c5b73ed4de4"}],"title":"ibmveth: Disable GSO for packets with small MSS","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-46273","datePublished":"2026-06-03T16:19:18.056Z","dateReserved":"2026-05-13T15:03:33.109Z","dateUpdated":"2026-06-03T16:19:18.056Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-06-03 18:16:29","lastModifiedDate":"2026-06-03 18:16:29","problem_types":[],"metrics":[],"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"46273","Ordinal":"1","Title":"ibmveth: Disable GSO for packets with small MSS","CVE":"CVE-2026-46273","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"46273","Ordinal":"1","NoteData":"In the Linux kernel, the following vulnerability has been resolved:\n\nibmveth: Disable GSO for packets with small MSS\n\nSome physical adapters on Power systems do not support segmentation\noffload when the MSS is less than 224 bytes. Attempting to send such\npackets causes the adapter to freeze, stopping all traffic until\nmanually reset.\n\nImplement ndo_features_check to disable GSO for packets with small MSS\nvalues. The network stack will perform software segmentation instead.\n\nThe 224-byte minimum matches ibmvnic\ncommit <f10b09ef687f> (\"ibmvnic: Enforce stronger sanity checks\non GSO packets\")\nwhich uses the same physical adapters in SEA configurations.\n\nThe issue occurs specifically when the hardware attempts to perform\nsegmentation (gso_segs > 1) with a small MSS. Single-segment GSO packets\n(gso_segs == 1) do not trigger the problematic LSO code path and are\ntransmitted normally without segmentation.\n\nAdd an ndo_features_check callback to disable GSO when MSS < 224 bytes.\nAlso call vlan_features_check() to ensure proper handling of VLAN packets,\nparticularly QinQ (802.1ad) configurations where the hardware parser may\nnot support certain offload features.\n\nValidated using iptables to force small MSS values. Without the fix,\nthe adapter freezes. With the fix, packets are segmented in software\nand transmission succeeds. Comprehensive regression testing completedd\n(MSS tests, performance, stability).","Type":"Description","Title":"ibmveth: Disable GSO for packets with small MSS"}]}}}