{"id":"CVE-2026-98042","title":"In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Don't resurrect a scalar id dropped by collect_linked_regs()\n\ncheck_cond_jmp_op() copies the compared registers into\nenv->{false,true}_reg{1,2} before collect_link…","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Don't resurrect a scalar id dropped by collect_linked_regs()\n\ncheck_cond_jmp_op() copies the compared registers into\nenv->{false,true}_reg{1,2} before collect_link…","severity":"none","vendor":"Linux","product":"Linux","affected":["Linux >= ec1d77cb0ee98249142dcd0376d76e7a48ba0b31 < e821ff19b8ef08255ff8d8234774ed814637e9bf","Linux >= ec1d77cb0ee98249142dcd0376d76e7a48ba0b31 < 73a98f96811e2cb0f4210b1caa8cb322f92f2a2b","Linux 7.1"],"published":"2026-09-25","updated":"2026-09-25","sourceUpdated":"2026-09-25T11:17:32.987","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-98042","references":[{"url":"https://git.kernel.org/stable/c/73a98f96811e2cb0f4210b1caa8cb322f92f2a2b","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/e821ff19b8ef08255ff8d8234774ed814637e9bf","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"}],"tags":["nvd","cve.org"],"ingestedAt":"2026-09-25T11:06:38.849Z","slug":"CVE-2026-98042","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Don't resurrect a scalar id dropped by collect_linked_regs()\n\ncheck_cond_jmp_op() copies the compared registers into\nenv->{false,true}_reg{1,2} before collect_linked_regs() runs and copies\nthose snapshots back into both branch states afterwards.\n\ncollect_linked_regs() records at most LINKED_REGS_MAX members of a\nlinked registers group in the jump history and calls clear_scalar_id()\nfor every member that does not fit. The compared register is not exempt\nfrom that.\n\nAs a consequence, sync_linked_regs() might adjust ranges for more\nregisters than bpf_bt_sync_linked_regs() can propagate precision to.\n\nCollect the linked registers before the snapshots are taken instead.\nThis might lead to some unnecessary clear_scalar_id's, but from\nprevious testing situations with many linked registers are\nextremely rare.\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":[]}