{"id":"CVE-2021-46911","title":"In the Linux kernel, the following vulnerability has been resolved:\n\nch_ktls: Fix kernel panic\n\nTaking page refcount is not ideal and causes kernel panic\nsometimes","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nch_ktls: Fix kernel panic\n\nTaking page refcount is not ideal and causes kernel panic\nsometimes. It's better to take tx_ctx lock for the complete\nskb transmit, to avoid …","severity":"critical","cvss":9.8,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","vendor":"linux","product":"linux_kernel","affected":["linux_kernel >= 5.7.0, < 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-2021-46911","references":[{"url":"https://git.kernel.org/stable/c/1a73e427b824133940c2dd95ebe26b6dce1cbf10","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/8348665d4181c68b0ca1205b48e1753d78bc810f","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/8d5a9dbd2116a852f8f0f91f6fbc42a0afe1091f","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/1a73e427b824133940c2dd95ebe26b6dce1cbf10","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://git.kernel.org/stable/c/8348665d4181c68b0ca1205b48e1753d78bc810f","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://git.kernel.org/stable/c/8d5a9dbd2116a852f8f0f91f6fbc42a0afe1091f","label":"af854a3a-2127-422b-91ae-364da2661108"}],"tags":["nvd"],"epss":0.00594,"epssPercentile":0.46218,"ingestedAt":"2026-08-04T10:39:38.193Z","slug":"CVE-2021-46911","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nch_ktls: Fix kernel panic\n\nTaking page refcount is not ideal and causes kernel panic\nsometimes. It's better to take tx_ctx lock for the complete\nskb transmit, to avoid page cleanup if ACK received in middle.\n\n## Affected\n\n- `linux_kernel >= 5.7.0, < 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":"midnight","depthScore":54,"depthScoreParts":{"impact":53.9,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}