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Medium severity · published Jun 25, 2026
CVE-2026-53236
tcp: restrict SO_ATTACH_FILTER to priv users
5.5
CVSS
0.1%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Attack vector
Local
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
None
Integrity
None
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.1% · higher than 2% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
KE
Kernel · Linux
2.6.12.1 before 6.1.176; 6.2 before 6.6.143; 6.7 before 6.12.94; 6.13 before 6.18.36; 6.19 before 7.0.13; 2.6.12; +11 more · source: NVD
LI
Linux · Linux
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before 3747de241a66ef2c7032d2cc2b826a47c5fa0f6a; 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before ecfe9171b26ae3eed0cd8bab7a943e9e2c9e51ba; 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before 82b3e7ce10c53fc12aab8904745603efc74f8c07; 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before ede69b8f6670600e534591664584f810d7c385f9; 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before c68517a3e18e20997808821c5559d0cba4d776c1; 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before 5d39580f68e6ddeedd15e587282207489dfb3da2; +1 more · source: vendor
SS
SIMATIC S7-1500 CPU 1518-4 PN/DP MFP · Siemens
V3.1.6; V3.1.7; V3.1.6; V3.1.7 · source: CISA
SS
SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP · Siemens
V3.1.6; V3.1.7; V3.1.6; V3.1.7 · source: CISA
SS
SIMATIC S7-1500 TM MFP - GNU/Linux subsystem · Siemens
0 · source: CISA
SS
SIPLUS S7-1500 CPU 1518-4 PN/DP MFP · Siemens
V3.1.6; V3.1.7 · source: CISA
Affected product
KE
Kernel
Linux
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-53236
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-53236
Patch
https://git.kernel.org/stable/c/3747de241a66ef2c7032d2cc2b826a47c5fa0f6a
Patch
https://git.kernel.org/stable/c/5d39580f68e6ddeedd15e587282207489dfb3da2
Patch
https://git.kernel.org/stable/c/82b3e7ce10c53fc12aab8904745603efc74f8c07
Patch
https://git.kernel.org/stable/c/c68517a3e18e20997808821c5559d0cba4d776c1
Patch
https://git.kernel.org/stable/c/ecfe9171b26ae3eed0cd8bab7a943e9e2c9e51ba
Patch
https://git.kernel.org/stable/c/ede69b8f6670600e534591664584f810d7c385f9
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