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CVE-2026-53236

24
FAUCET Score

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.

First published: Jun 25, 2026Last modified: Jun 25, 2026

Impacted Technologies

VendorProductVersion(s)CPE
>= 2.6.12.1, < 6.1.176CPE matchmatch criteria
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
>= 6.2, < 6.6.143CPE matchmatch criteria
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
>= 6.7, < 6.12.94CPE matchmatch criteria
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
>= 6.13, < 6.18.36CPE matchmatch criteria
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
>= 6.19, < 7.0.13CPE matchmatch criteria
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

5.5MEDIUM

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
Exploitability Score
1.8
Impact Score
3.6
CvssVersion
3.1

Exploit Intelligence

EPSS Score
0.12%
Probability of exploitation in next 30 days
EPSS Percentile
2.4%
Percentile rank of EPSS score among Peer Group
As of 2026-07-28
Model: v2026.06.15
This CVE's current EPSS score of 0.0012 is in the 16th percentile among its peer group of 15,940 CVEs.

Social Chatter

No social media mentions found for this CVE.

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.0 Bluesky, 0.0 Mastodon, and 0.1 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (2)

microsoftpatch availablevia msrc
Product: azl3 kernel 6.6.141.1-1 on Azure Linux 3.0Fixed in: 6.6.143.1-1
microsoftpatch availablevia msrc
Product: 21443-17084Fixed in: 6.6.143.1-1

Vendor Advisories (1)

microsoft2026-Jun/CVE-2026-53236Moderate

tcp: restrict SO_ATTACH_FILTER to priv users

Jun 9, 2026

References

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