CVE-2026-53236 is a vulnerability in Linux Kernel
Published on June 25, 2026
tcp: restrict SO_ATTACH_FILTER to priv users
In the Linux kernel, the following vulnerability has been resolved:
tcp: restrict SO_ATTACH_FILTER to priv users
This patch restricts the use of SO_ATTACH_FILTER (cBPF) on TCP sockets
to users with CAP_NET_ADMIN capability.
This blocks potential side-channel attack where an unprivileged application
attaches a filter to leak TCP sequence/acknowledgment numbers.
Products Associated with CVE-2026-53236
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Affected Versions
Linux:- Version 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and below 3747de241a66ef2c7032d2cc2b826a47c5fa0f6a is affected.
- Version 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and below ecfe9171b26ae3eed0cd8bab7a943e9e2c9e51ba is affected.
- Version 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and below 82b3e7ce10c53fc12aab8904745603efc74f8c07 is affected.
- Version 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and below ede69b8f6670600e534591664584f810d7c385f9 is affected.
- Version 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and below c68517a3e18e20997808821c5559d0cba4d776c1 is affected.
- Version 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and below 5d39580f68e6ddeedd15e587282207489dfb3da2 is affected.
- Version 2.6.12 is affected.
- Before 2.6.12 is unaffected.
- Version 6.1.176, <= 6.1.* is unaffected.
- Version 6.6.143, <= 6.6.* is unaffected.
- Version 6.12.94, <= 6.12.* is unaffected.
- Version 6.18.36, <= 6.18.* is unaffected.
- Version 7.0.13, <= 7.0.* is unaffected.
- Version 7.1, <= * is unaffected.