{"id":"CVE-2026-98589","title":"bpf: Reject pkt arguments in mutating subprogs","summary":"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…","severity":"none","vendor":"Linux","product":"Linux","affected":["Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 0b6b2bb9b90ad1e2d94d18f626258a1dbbdee0ea","Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < a6c1edfbe240e4377038a0e1d233ad81fde9a21b","Linux < 7.2.9","Linux (all versions)"],"published":"2026-10-18","updated":"2026-10-19","sourceUpdated":"2026-10-19T09:22:14.803Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-98589","references":[{"url":"https://git.kernel.org/stable/c/0b6b2bb9b90ad1e2d94d18f626258a1dbbdee0ea"},{"url":"https://git.kernel.org/stable/c/a6c1edfbe240e4377038a0e1d233ad81fde9a21b"}],"tags":["cve.org"],"ingestedAt":"2026-10-18T15:45:12.250Z","slug":"CVE-2026-98589","body":"## Overview\n\nIn 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.\n\n## Affected\n\n- `Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 0b6b2bb9b90ad1e2d94d18f626258a1dbbdee0ea`\n- `Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < a6c1edfbe240e4377038a0e1d233ad81fde9a21b`\n- `Linux < 7.2.9`\n- `Linux (all versions)`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":3,"depthScoreParts":{"impact":2.8,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}