{"id":"AZL-109116","summary":"CVE-2026-98589 affecting package kernel 6.6.157.1-1","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Reject pkt arguments in mutating subprogs\n\nThe verifier tracks changes in how PTR_TO_PACKET registers'\nbounds are modified across subprog boundaries. PTR_TO_PACKET\nregisters are actually passed as PTR_TO_MEM, which is assumed\nvalid for the entire call. This is not the case with packet memory,\nwhere a pskb_* call may invalidate its memory region.\n\nReject BPF code that passes PTR_TO_PACKET pointers to subprogs that\nmay mutate a packet. We cannot pass the pointer as a true PTR_TO_PACKET\nbecause we would also need to somehow pass the PTR_TO_PACKET_META\nor PTR_TO_PACKET_END to the subprog. Since we cannot avoid representing\nthe pointer in the subprog as PTR_TO_MEM, only permit it if the\nsubprog is guaranteed not to mutate the packet.","modified":"2026-10-19T14:16:31.636320468Z","published":"2026-10-18T16:17:11Z","upstream":["CVE-2026-98589"],"references":[{"type":"WEB","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-98589"}],"affected":[{"package":{"name":"kernel","ecosystem":"Azure Linux:3","purl":"pkg:rpm/azure-linux/kernel"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"last_affected":"6.6.157.1-1"}]}],"database_specific":{"source":"https://github.com/microsoft/AzureLinuxVulnerabilityData/blob/main/osv/AZL-109116.json"}}],"schema_version":"1.9.0"}