{"id":"CVE-2021-46908","title":"In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Use correct permission flag for mixed signed bounds arithmetic\n\nWe forbid adding unknown scalars with mixed signed bounds due to the\nspectre v1 masking mitigation.…","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Use correct permission flag for mixed signed bounds arithmetic\n\nWe forbid adding unknown scalars with mixed signed bounds due to the\nspectre v1 masking mitigation.…","severity":"high","cvss":7.1,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H","vendor":"linux","product":"linux_kernel","affected":["linux_kernel >= 5.8.0, < 5.10.32","linux_kernel >= 5.11.0, < 5.11.16"],"patched":["linux_kernel 5.11.16"],"published":"2024-02-27","updated":"2026-08-04","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2021-46908","references":[{"url":"https://git.kernel.org/stable/c/4ccdc6c6cae38b91c871293fb0ed8c6845a61b51","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/4f3ff11204eac0ee23acf64deecb3bad7b0db0c6","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/9601148392520e2e134936e76788fc2a6371e7be","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/4ccdc6c6cae38b91c871293fb0ed8c6845a61b51","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://git.kernel.org/stable/c/4f3ff11204eac0ee23acf64deecb3bad7b0db0c6","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://git.kernel.org/stable/c/9601148392520e2e134936e76788fc2a6371e7be","label":"af854a3a-2127-422b-91ae-364da2661108"}],"tags":["nvd"],"epss":0.00241,"epssPercentile":0.15508,"ingestedAt":"2026-08-04T10:39:38.135Z","slug":"CVE-2021-46908","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Use correct permission flag for mixed signed bounds arithmetic\n\nWe forbid adding unknown scalars with mixed signed bounds due to the\nspectre v1 masking mitigation. Hence this also needs bypass_spec_v1\nflag instead of allow_ptr_leaks.\n\n## Affected\n\n- `linux_kernel >= 5.8.0, < 5.10.32`\n- `linux_kernel >= 5.11.0, < 5.11.16`\n\n## Remediation\n\nUpgrade past the affected range:\n\n- `linux_kernel 5.11.16`","depth":"twilight","depthScore":39,"depthScoreParts":{"impact":39.1,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}