{"answers":{"affected":"It affects 1 product.","exploited":"There is no known exploitation of CVE-2026-46273 in the wild and no public exploit code.","fix":"Apply the vendor's patch.","what":"CVE-2026-46273 is a high-severity denial of service vulnerability in Linux kernel, published on 3 Jun 2026. An attacker can exploit it over the internet without logging in, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2026-46273 and fix it if it is affected.\n\nWhat it is: CVE-2026-46273 is a high-severity denial of service vulnerability in Linux kernel, published on 3 Jun 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.\nExploitation: There is no known exploitation of CVE-2026-46273 in the wild and no public exploit code.\n\nAffected product: Linux kernel. No package-level version data is available, so check the vendor advisory linked from the reference page.\n\nTask:\n1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.\n2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.\n3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.\n4. Run the tests and summarise what changed and why.\n5. If nothing in the project is affected, say so and change nothing.\n\nReference: https://insights.sbomify.com/CVE-2026-46273/ (Markdown: https://insights.sbomify.com/CVE-2026-46273/index.md)","id":"CVE-2026-46273","markdown":"https://insights.sbomify.com/CVE-2026-46273/index.md","name":"CVE-2026-46273","record":{"aliases":["AZL-89345","BELL-CVE-2026-46273","DEBIAN-CVE-2026-46273","GHSA-c3jf-v88j-7gvj","ROOT-OS-DEBIAN-11-CVE-2026-46273","ROOT-OS-DEBIAN-12-CVE-2026-46273","ROOT-OS-UBUNTU-2204-CVE-2026-46273","ROOT-OS-UBUNTU-2404-CVE-2026-46273","UBUNTU-CVE-2026-46273"],"analysis":{"component_type":"kernel","fix_type":"patch","impacts":["denial_of_service"],"network_reachable":"yes","non_default_config":false,"product_category":"Linux kernel driver","requires_auth":"none","summary":"A flaw in the Linux kernel ibmveth driver allows remote attackers to freeze network adapters by sending packets with small MSS values, causing a denial of service.","user_interaction":"not_required","vuln_class":"denial_of_service"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"Linux","cpe":[{"product":"linux_kernel","vendor":"linux"}],"cvss":{"score":8.6,"severity":"high","source":"cna","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H","version":"3.1"},"cwes":[{"id":"CWE-400","name":"Uncontrolled Resource Consumption"}],"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 \u003cf10b09ef687f\u003e (\"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 \u003e 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 \u003c 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).","ecosystems":[],"exploits":{"exploitdb":0,"first_seen":null,"github_poc":0,"max_poc_stars":null,"metasploit":0,"nuclei":0,"refs":[],"tier":"none_known"},"has_fix":true,"headline":"ibmveth: Disable GSO for packets with small MSS","id":"CVE-2026-46273","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":"linux:linux_kernel","products":["linux:linux_kernel"],"type":"denial_of_service","year":"2026"},"n_packages":0,"n_references":8,"next":{"headline":"io-wq: check that the predecessor is hashed in io_wq_remove_pending()","id":"CVE-2026-46274"},"packages":[],"prev":{"headline":"coresight: tmc-etr: Fix race condition between sysfs and perf mode","id":"CVE-2026-46272"},"products":["Linux"],"published":"2026-06-03","related":[{"cvss_score":8.8,"headline":"Linux Kernel Out-of-Bounds Write","id":"CVE-2026-53266","kev_date_added":"2026-09-18","published":"2026-06-25"},{"cvss_score":8.8,"headline":"Linux Kernel Improper Input Validation","id":"CVE-2013-6282","kev_date_added":"2022-09-15","published":"2013-11-19"},{"cvss_score":8.4,"headline":"Linux Kernel Heap-Based Buffer Overflow","id":"CVE-2022-0185","kev_date_added":"2024-08-21","published":"2022-02-11"},{"cvss_score":8.4,"headline":"Linux Kernel Privilege Escalation","id":"CVE-2013-2094","kev_date_added":"2022-09-15","published":"2013-05-14"},{"cvss_score":7.8,"headline":"Linux Kernel Unspecified","id":"CVE-2026-53362","kev_date_added":"2026-08-27","published":"2026-07-04"},{"cvss_score":7.8,"headline":"Linux Kernel Missing Initialization of a Variable","id":"CVE-2026-46300","kev_date_added":"2026-10-28","published":"2026-05-23"},{"cvss_score":7.8,"headline":"Linux Kernel Race Condition","id":"CVE-2025-39964","kev_date_added":"2026-09-18","published":"2025-10-13"}],"sources":[{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"class":"attribution","licence":"US public information, NVD API terms","name":"NVD"},{"class":"attribution","licence":"CWE Terms of Use","name":"CWE (MITRE)"},{"class":"attribution","licence":"FIRST CVSS licence","name":"CVSS (FIRST)"}],"ssvc":{"automatable":"yes","exploitation":"none","technical_impact":"partial"},"state":"PUBLISHED","updated":"2026-08-07","vendors":["Linux"]},"summary":"A flaw in the Linux kernel ibmveth driver allows remote attackers to freeze network adapters by sending packets with small MSS values, causing a denial of service.","url":"https://insights.sbomify.com/CVE-2026-46273/"}