{"id":"CVE-2026-74475","summary":"vxlan: use neigh_ha_snapshot() in route_shortcircuit()","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nvxlan: use neigh_ha_snapshot() in route_shortcircuit()\n\nThe neighbour hardware address n-\u003eha can be updated asynchronously by the\nneighbour subsystem, protected by n-\u003eha_lock seqlock. Reading n-\u003eha without\nholding the seqlock loop can lead to torn reads or reading a partially updated\nMAC address.\n\nUse neigh_ha_snapshot() in route_shortcircuit() to safely copy n-\u003eha under\nread_seqbegin()/read_seqretry() lock protection before using it.\n\nNote that arp_reduce() and neigh_reduce() seem to have the same issue\nleft for future patches.","modified":"2026-08-21T03:30:40.377101594Z","published":"2026-08-15T12:27:10.685Z","database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/74xxx/CVE-2026-74475.json","cna_assigner":"Linux"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/05f2987f73daa05333fd713d05546142f9f7c5f0"},{"type":"WEB","url":"https://git.kernel.org/stable/c/32a9590a8d30426e3db63e6b20893e47e02576c0"},{"type":"WEB","url":"https://git.kernel.org/stable/c/87210054bad82bbae6f483a742dc45722fb47a6b"},{"type":"WEB","url":"https://git.kernel.org/stable/c/8eca411347e1d38964f9ed2c8d3b6ab0e7e4473d"},{"type":"WEB","url":"https://git.kernel.org/stable/c/d08e8ac13f2e228cc7fc3c70b5ebe71557b624a0"},{"type":"WEB","url":"https://git.kernel.org/stable/c/d0993fc053f29e15cc7c9fe2029df3882a2ab5ab"},{"type":"WEB","url":"https://git.kernel.org/stable/c/ec341bb76d77b4c2948764375ee6bfeef4bb41c3"},{"type":"WEB","url":"https://git.kernel.org/stable/c/ff89415d34c3ab9f5312316423122e664ed3524f"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/74xxx/CVE-2026-74475.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-74475"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"e4f67addf158f98f8197e08974966b18480dc751"},{"fixed":"32a9590a8d30426e3db63e6b20893e47e02576c0"},{"fixed":"d0993fc053f29e15cc7c9fe2029df3882a2ab5ab"},{"fixed":"87210054bad82bbae6f483a742dc45722fb47a6b"},{"fixed":"d08e8ac13f2e228cc7fc3c70b5ebe71557b624a0"},{"fixed":"ec341bb76d77b4c2948764375ee6bfeef4bb41c3"},{"fixed":"ff89415d34c3ab9f5312316423122e664ed3524f"},{"fixed":"05f2987f73daa05333fd713d05546142f9f7c5f0"},{"fixed":"8eca411347e1d38964f9ed2c8d3b6ab0e7e4473d"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-74475.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"3.8.0"},{"fixed":"5.10.265"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.11.0"},{"fixed":"5.15.216"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.16.0"},{"fixed":"6.1.183"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.2.0"},{"fixed":"6.6.151"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.7.0"},{"fixed":"6.12.103"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.13.0"},{"fixed":"6.18.44"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.19.0"},{"fixed":"7.1.8"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-74475.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:L"}]}