CVE-2026-53236

tcp: restrict SO_ATTACH_FILTER to priv users

EPSS 0.2%

Vexday Risk Score

3Low

SSVC decision (CISA)

Track

No exploitation signal → monitor

CVSS —EPSS 0.2%KEV nãoPoC —Nuclei —Metasploit —Patch —

Lifecycle

25 Jun 2026Published on NVD

Recommendation: Monitor — no exploitation signal at the moment.

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 · Linux

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References

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