{"id":"AZL-90908","summary":"CVE-2026-52915 affecting package kernel for versions less than 6.6.143.1-1","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: ip6t_hbh: reject oversized option lists\n\nstruct ip6t_opts stores at most IP6T_OPTS_OPTSNR option descriptors,\nbut hbh_mt6_check() does not reject larger optsnr values supplied from\nuserspace.\n\nValidate optsnr in the rule setup path so only match data that fits the\nfixed-size opts array can be installed. This follows the existing xtables\npattern of rejecting invalid user-provided counts in checkentry() and\nkeeps the packet matching path unchanged.\n\n`struct ip6t_opts` has a fixed `opts[IP6T_OPTS_OPTSNR]` array,\nwhere `IP6T_OPTS_OPTSNR` is 16, then off-by-one array access is possible:\n\n[  137.924693][ T8692] UBSAN: array-index-out-of-bounds in ../net/ipv6/netfilter/ip6t_hbh.c:110:29\n[  137.926167][ T8692] index 16 is out of range for type '__u16 [16]'","modified":"2026-08-28T17:48:11.802528762Z","published":"2026-06-24T08:16:21Z","upstream":["CVE-2026-52915"],"references":[{"type":"WEB","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-52915"}],"affected":[{"package":{"name":"kernel","ecosystem":"Azure Linux:3","purl":"pkg:rpm/azure-linux/kernel"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.6.143.1-1"}]}],"database_specific":{"source":"https://github.com/microsoft/AzureLinuxVulnerabilityData/blob/main/osv/AZL-90908.json"}}],"schema_version":"1.9.0"}