CVE-2026-53236

Summary

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.

Affected Software

VendorProductVersion RangeStatus
LinuxLinux1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 3747de241a66ef2c7032d2cc2b826a47c5fa0f6aaffected
LinuxLinux1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < ecfe9171b26ae3eed0cd8bab7a943e9e2c9e51baaffected
LinuxLinux1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 82b3e7ce10c53fc12aab8904745603efc74f8c07affected
LinuxLinux1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < ede69b8f6670600e534591664584f810d7c385f9affected
LinuxLinux1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < c68517a3e18e20997808821c5559d0cba4d776c1affected
LinuxLinux1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 5d39580f68e6ddeedd15e587282207489dfb3da2affected
LinuxLinux2.6.12affected
LinuxLinux0 < 2.6.12unaffected
LinuxLinux6.1.176 <= 6.1.*unaffected
LinuxLinux6.6.143 <= 6.6.*unaffected
LinuxLinux6.12.94 <= 6.12.*unaffected
LinuxLinux6.18.36 <= 6.18.*unaffected
LinuxLinux7.0.13 <= 7.0.*unaffected
LinuxLinux7.1 <= *unaffected

Weaknesses

References