{"answers":{"affected":"","exploited":"There is no known exploitation of CVE-2026-63955 in the wild and no public exploit code.","fix":"Apply the vendor's patch.","what":"CVE-2026-63955 is a high-severity denial of service vulnerability in Linux, published on 19 Jul 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-2026-63955 and fix it if it is affected.\n\nWhat it is: CVE-2026-63955 is a high-severity denial of service vulnerability in Linux, published on 19 Jul 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-2026-63955 in the wild and no public exploit code.\n\nAffected product: Linux. 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-2026-63955/ (Markdown: https://insights.sbomify.com/CVE-2026-63955/index.md)","id":"CVE-2026-63955","markdown":"https://insights.sbomify.com/CVE-2026-63955/index.md","name":"CVE-2026-63955","record":{"aliases":["DEBIAN-CVE-2026-63955","GHSA-jvrv-jph4-c9c9","UBUNTU-CVE-2026-63955"],"analysis":{"component_type":"kernel","fix_type":"patch","impacts":["denial_of_service"],"network_reachable":"yes","non_default_config":false,"product_category":"Linux kernel","requires_auth":"none","summary":"A local attacker can trigger a kernel panic by performing network bridge operations that disable bottom halves, causing a denial of service.","user_interaction":"not_required","vuln_class":"denial_of_service"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"Linux","cpe":[],"cvss":{"score":7.5,"severity":"high","source":"cna","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","version":"3.1"},"cwes":[],"description":"In the Linux kernel, the following vulnerability has been resolved:\n\nmm/vmalloc: do not trigger BUG() on BH disabled context\n\n__get_vm_area_node() currently triggers a BUG() if in_interrupt() returns\ntrue.  However, in_interrupt() also reports true when BH are disabled.\n\nThe bridge code can call rhashtable_lookup_insert_fast() with bottom\nhalves disabled:\n\n__vlan_add()\n -\u003e br_fdb_add_local()\n  spin_lock_bh(\u0026br-\u003ehash_lock); \u003c-- Disable BH\n   -\u003e fdb_add_local()\n    -\u003e fdb_create()\n     -\u003e rhashtable_lookup_insert_fast()\n      -\u003e kvmalloc()\n       -\u003e vmalloc()\n        -\u003e __get_vm_area_node()\n         -\u003e BUG_ON(in_interrupt())\n  spin_unlock_bh(\u0026br-\u003ehash_lock)\n\nthis triggers the BUG() despite the caller not being in NMI or\nhard IRQ context.\n\nReplace the in_interrupt() check with in_nmi() || in_hardirq().","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":"mm/vmalloc: do not trigger BUG() on BH disabled context","id":"CVE-2026-63955","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":null,"products":[],"type":"denial_of_service","year":"2026"},"n_packages":0,"n_references":2,"next":{"headline":"USB: serial: cypress_m8: fix memory corruption with small endpoint","id":"CVE-2026-63956"},"packages":[],"prev":{"headline":"hpfs: fix a crash if hpfs_map_dnode_bitmap fails","id":"CVE-2026-63954"},"products":["Linux"],"published":"2026-07-19","related":[],"sources":[{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"class":"attribution","licence":"FIRST CVSS licence","name":"CVSS (FIRST)"}],"ssvc":{"automatable":null,"exploitation":null,"technical_impact":null},"state":"PUBLISHED","updated":"2026-08-05","vendors":["Linux"]},"summary":"A local attacker can trigger a kernel panic by performing network bridge operations that disable bottom halves, causing a denial of service.","url":"https://insights.sbomify.com/CVE-2026-63955/"}