{"id":"CVE-2026-53236","title":"In the Linux kernel, the following vulnerability has been resolved:\n\ntcp: restrict SO_ATTACH_FILTER to priv users\n\nThis patch restricts the use of SO_ATTACH_FILTER (cBPF) on TCP sockets\nto users with CAP_NET_ADMIN capability.\n\nThis block…","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\ntcp: restrict SO_ATTACH_FILTER to priv users\n\nThis patch restricts the use of SO_ATTACH_FILTER (cBPF) on TCP sockets\nto users with CAP_NET_ADMIN capability.\n\nThis block…","severity":"medium","cvss":5.5,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","vendor":"linux","product":"linux_kernel","affected":["linux_kernel >= 2.6.12.1, < 6.1.176","linux_kernel >= 6.2, < 6.6.143","linux_kernel >= 6.7, < 6.12.94","linux_kernel >= 6.13, < 6.18.36","linux_kernel >= 6.19, < 7.0.13","linux_kernel = 2.6.12","linux_kernel = 7.1"],"patched":["linux_kernel 7.0.13"],"published":"2026-06-25","updated":"2026-09-08","sourceUpdated":"2026-09-08T09:18:14.913","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-53236","references":[{"url":"https://git.kernel.org/stable/c/3747de241a66ef2c7032d2cc2b826a47c5fa0f6a","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/5d39580f68e6ddeedd15e587282207489dfb3da2","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/82b3e7ce10c53fc12aab8904745603efc74f8c07","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/c68517a3e18e20997808821c5559d0cba4d776c1","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/ecfe9171b26ae3eed0cd8bab7a943e9e2c9e51ba","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/ede69b8f6670600e534591664584f810d7c385f9","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://cert-portal.siemens.com/productcert/html/ssa-019113.html","label":"0b142b55-0307-4c5a-b3c9-f314f3fb7c5e"}],"tags":["nvd","cve.org"],"epss":0.00123,"epssPercentile":0.02335,"ingestedAt":"2026-09-08T13:33:25.832Z","slug":"CVE-2026-53236","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\ntcp: restrict SO_ATTACH_FILTER to priv users\n\nThis patch restricts the use of SO_ATTACH_FILTER (cBPF) on TCP sockets\nto users with CAP_NET_ADMIN capability.\n\nThis blocks potential side-channel attack where an unprivileged application\nattaches a filter to leak TCP sequence/acknowledgment numbers.\n\n## Affected\n\n- `linux_kernel >= 2.6.12.1, < 6.1.176`\n- `linux_kernel >= 6.2, < 6.6.143`\n- `linux_kernel >= 6.7, < 6.12.94`\n- `linux_kernel >= 6.13, < 6.18.36`\n- `linux_kernel >= 6.19, < 7.0.13`\n- `linux_kernel = 2.6.12`\n- `linux_kernel = 7.1`\n\n## Remediation\n\nUpgrade past the affected range:\n\n- `linux_kernel 7.0.13`","depth":"sunlit","depthScore":30,"depthScoreParts":{"impact":30.3,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}