{"id":"CVE-2026-98626","published":"2026-10-18T16:17:15.640","lastModified":"2026-10-19T10:19:26.820","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Restrict CO-RE poisoning to relocatable instructions\n\nCO-RE relocation records can name any instruction offset. When a\nrelocation cannot be resolved, bpf_core_patch_insn() currently poisons its\ntarget before checking whether that instruction is a valid relocation\ntarget. Malformed metadata can therefore replace jumps, calls, exits,\nregister-source arithmetic, or non-immediate loads instead of failing at\nthe relocation step.\n\nHandle poisoning only after the instruction has passed the same class and\noperand-form checks used for a resolved relocation. Route invalid forms\nthrough the existing diagnostic and return a hard error. Keep poisoning\nsupported instructions, including both halves of a plain ldimm64, so an\nunresolved relocation in dead code remains valid.\n\nExtend bpf_core_poison_insn() to poison both halves of ldimm64, and return\nits status directly from each validated instruction case. This avoids\nrouting the success path through a common label and leaves the helper free\nto report errors.\n\nThe shared relocation code applies this restriction to both libbpf and\nin-kernel CO-RE.","cvssScore":null,"cvssSeverity":null,"cvssVector":null,"cwes":[],"vendors":[],"products":[],"references":[{"url":"https://git.kernel.org/stable/c/2d7d04357c41aa49a5ac658fcc207439f2ad6456","tags":[]},{"url":"https://git.kernel.org/stable/c/394ae398337c5f87e567f6cd63b937fc2b2f6ddc","tags":[]},{"url":"https://git.kernel.org/stable/c/8e4cbcca1e0a2fc5e6c8edb68e0cf5f2587f9319","tags":[]},{"url":"https://git.kernel.org/stable/c/a0b79cdfcf34b53c85bac2d3cf022fc1342eeca0","tags":[]},{"url":"https://git.kernel.org/stable/c/a8c47e62d9aea2d47a09e06c1682c59c21b92449","tags":[]},{"url":"https://git.kernel.org/stable/c/d3219c229d16900cef936adad28633c98946e432","tags":[]},{"url":"https://git.kernel.org/stable/c/f2a24101e89dd0804e717da7c1bd6af513698aa2","tags":[]}],"exploitRefs":[],"hasPoc":false,"ai":null}