CVE-2026-53236

Description

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 products

• Linux / Linux1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 – 3747de241a66ef2c7032d2cc2b826a47c5fa0f6a
• Linux / Linux1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 – ecfe9171b26ae3eed0cd8bab7a943e9e2c9e51ba
• Linux / Linux1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 – 82b3e7ce10c53fc12aab8904745603efc74f8c07
• Linux / Linux1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 – ede69b8f6670600e534591664584f810d7c385f9
• Linux / Linux1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 – c68517a3e18e20997808821c5559d0cba4d776c1
• Linux / Linux1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 – 5d39580f68e6ddeedd15e587282207489dfb3da2
• Linux / Linux2.6.12 – 2.6.12
• Linux / Linux0 – 2.6.12
• Linux / Linux6.1.176 – 6.1.*
• Linux / Linux6.6.143 – 6.6.*
• Linux / Linux6.12.94 – 6.12.*
• Linux / Linux6.18.36 – 6.18.*
• Linux / Linux7.0.13 – 7.0.*
• Linux / Linux7.1 – *

References

• MISChttps://git.kernel.org/stable/c/3747de241a66ef2c7032d2cc2b826a47c5fa0f6a
• MISChttps://git.kernel.org/stable/c/ecfe9171b26ae3eed0cd8bab7a943e9e2c9e51ba
• MISChttps://git.kernel.org/stable/c/82b3e7ce10c53fc12aab8904745603efc74f8c07
• MISChttps://git.kernel.org/stable/c/ede69b8f6670600e534591664584f810d7c385f9
• MISChttps://git.kernel.org/stable/c/c68517a3e18e20997808821c5559d0cba4d776c1
• MISChttps://git.kernel.org/stable/c/5d39580f68e6ddeedd15e587282207489dfb3da2