{"id":"CVE-2026-31738","summary":"vxlan: validate ND option lengths in vxlan_na_create","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nvxlan: validate ND option lengths in vxlan_na_create\n\nvxlan_na_create() walks ND options according to option-provided\nlengths. A malformed option can make the parser advance beyond the\ncomputed option span or use a too-short source LLADDR option payload.\n\nValidate option lengths against the remaining NS option area before\nadvancing, and only read source LLADDR when the option is large enough\nfor an Ethernet address.","modified":"2026-07-09T18:30:17.618386009Z","published":"2026-05-01T14:14:34.900Z","related":["SUSE-SU-2026:2068-1","SUSE-SU-2026:2111-1","SUSE-SU-2026:21834-1","SUSE-SU-2026:21841-1","SUSE-SU-2026:21845-1","SUSE-SU-2026:21860-1","SUSE-SU-2026:21876-1","SUSE-SU-2026:21877-1","SUSE-SU-2026:21916-1","SUSE-SU-2026:21919-1","SUSE-SU-2026:2195-1","SUSE-SU-2026:2202-1","SUSE-SU-2026:2215-1","SUSE-SU-2026:2216-1","SUSE-SU-2026:2217-1","SUSE-SU-2026:2238-1","openSUSE-SU-2026:20826-1"],"database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/31xxx/CVE-2026-31738.json","cna_assigner":"Linux"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/2029712fb2c87e9a8c75094906f2ee29bf08c500"},{"type":"WEB","url":"https://git.kernel.org/stable/c/602596c69a70e50d9ab8c6ae0290a01f88229dd7"},{"type":"WEB","url":"https://git.kernel.org/stable/c/901c1dd3bab2955d7e664f914c374c8c3ac2b958"},{"type":"WEB","url":"https://git.kernel.org/stable/c/afa9a05e6c4971bd5586f1b304e14d61fb3d9385"},{"type":"WEB","url":"https://git.kernel.org/stable/c/b69c4236255bd8de16cd876e58c6f0867d1d78b1"},{"type":"WEB","url":"https://git.kernel.org/stable/c/de20d2e3b9179d132f5f5b44e490d7c916c6321b"},{"type":"WEB","url":"https://git.kernel.org/stable/c/e476745917a1e288eb15e7ff49d286a86a4861d3"},{"type":"WEB","url":"https://git.kernel.org/stable/c/eddfce70a6f3107d1679b0c2fcbeb96b593bd679"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/31xxx/CVE-2026-31738.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-31738"},{"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":"4b29dba9c085a4fb79058fb1c45a2f6257ca3dfa"},{"fixed":"901c1dd3bab2955d7e664f914c374c8c3ac2b958"},{"fixed":"e476745917a1e288eb15e7ff49d286a86a4861d3"},{"fixed":"2029712fb2c87e9a8c75094906f2ee29bf08c500"},{"fixed":"602596c69a70e50d9ab8c6ae0290a01f88229dd7"},{"fixed":"de20d2e3b9179d132f5f5b44e490d7c916c6321b"},{"fixed":"eddfce70a6f3107d1679b0c2fcbeb96b593bd679"},{"fixed":"b69c4236255bd8de16cd876e58c6f0867d1d78b1"},{"fixed":"afa9a05e6c4971bd5586f1b304e14d61fb3d9385"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"0"},{"last_affected":"d8be18c52dbc94989f6d74637b731af39cd3d902"},{"last_affected":"3927dace523706cc00f808520eaf2125dd7c07b5"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"3.12.18"},{"fixed":"3.13"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"3.13.10"},{"fixed":"3.14"}]}],"versions":["v3.13","v3.13.9","v3.12.17","v3.13.8","v3.12.16","v3.13.7","v3.12.15","v3.13.6","v3.12.14","v3.13.5","v3.12.13","v3.13.4","v3.12.12","v3.13.3","v3.12.11","v3.13.2","v3.12.10","v3.13-rc6","v3.13.1","v3.12.9","v3.12.8","v3.13-rc8","v3.12","v3.13-rc7","v3.13-rc1","v3.12.7","v3.13-rc4","v3.13-rc3","v3.12.6","v3.13-rc5","v3.13-rc2","v3.12.5","v3.12.4","v3.12.3","v3.12.2","v3.12.1","v3.12-rc7","v3.12-rc3","v3.12-rc6","v3.12-rc1","v3.12-rc5","v3.11","v3.12-rc2","v3.12-rc4","v3.11-rc7","v3.11-rc2","v3.11-rc5","v3.11-rc1","v3.11-rc3","v3.11-rc4","v3.11-rc6","v3.10-rc2","v3.10","v3.10-rc7","v3.10-rc6","v3.10-rc1","v3.10-rc5","v3.10-rc3","v3.10-rc4","v3.9","v3.9-rc2","v3.9-rc7","v3.9-rc8","v3.9-rc3","v3.9-rc6","v3.9-rc5","v3.9-rc4","v3.9-rc1","v3.8","v3.8-rc7","v3.8-rc6","v3.8-rc5","v3.8-rc2","v3.8-rc1","v3.8-rc3","v3.8-rc4","v3.7","v3.7-rc1","v3.6","v3.7-rc6","v3.7-rc7","v3.7-rc3","v3.7-rc8","v3.7-rc2","v3.7-rc4","v3.7-rc5","v3.6-rc7","v3.6-rc1","v3.5-rc3","v3.6-rc6","v3.6-rc5","v3.5","v3.6-rc3","v3.6-rc4","v3.6-rc2","v3.4-rc4","v3.5-rc7","v3.5-rc5","v3.5-rc6","v3.5-rc2","v3.5-rc1","v3.5-rc4","v3.4","v3.4-rc2","v3.4-rc1","v3.4-rc7","v3.4-rc6","v3.4-rc3","v3.4-rc5","v3.3","v3.3-rc6","v3.3-rc3","v3.3-rc7","v3.3-rc2","v3.3-rc5","v3.2","v3.3-rc4","v3.3-rc1","v3.2-rc4","v3.2-rc7","v3.2-rc6","v3.2-rc5","v3.2-rc3","v3.1","v3.2-rc2","v3.2-rc1","v3.1-rc1","v3.1-rc9","v3.1-rc8","v3.1-rc10","v3.1-rc7","v3.1-rc3","v3.1-rc2","v3.1-rc4","v3.1-rc5","v3.0","v3.1-rc6","v3.0-rc7","v3.0-rc4","v3.0-rc6","v3.0-rc5","v3.0-rc3","v3.0-rc1","v2.6.39","v3.0-rc2","v2.6.38","v2.6.39-rc2","v2.6.39-rc7","v2.6.39-rc5","v2.6.39-rc1","v2.6.38-rc7","v2.6.39-rc6","v2.6.39-rc4","v2.6.39-rc3","v2.6.37","v2.6.38-rc1","v2.6.38-rc8","v2.6.38-rc2","v2.6.38-rc6","v2.6.38-rc5","v2.6.38-rc4","v2.6.38-rc3","v2.6.37-rc4","v2.6.37-rc2","v2.6.36","v2.6.37-rc5","v2.6.37-rc8","v2.6.37-rc7","v2.6.37-rc6","v2.6.37-rc1","v2.6.37-rc3","v2.6.36-rc6","v2.6.35-rc4","v2.6.36-rc8","v2.6.35","v2.6.36-rc7","v2.6.36-rc3","v2.6.36-rc5","v2.6.36-rc4","v2.6.36-rc2","v2.6.36-rc1","v2.6.35-rc5","v2.6.35-rc6","v2.6.34","v2.6.35-rc3","v2.6.35-rc1","v2.6.35-rc2","v2.6.34-rc7","v2.6.34-r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