CVE-2026-53236tcp: restrict SO_ATTACH_FILTER to priv users
- 5.5MediumCVSS base score
- 0.13%Exploitation in 30 daysEPSS · top 98% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
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.
Timeline
ID reserved
By Linux
- 16 days later
· 16 days later
Published
- 5 months later
· 5 months later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| NVDNVD · Modified | 3.1 | Medium5.5 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H |
- EPSS (exploitation in 30 days)
- 0.13% · top 98% of all CVEs (14 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: no · Technical impact: partial
The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 5.5.
Affected products
- affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 – < 3747de241a66ef2c7032d2cc2b826a47c5fa0f6a
- affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 – < ecfe9171b26ae3eed0cd8bab7a943e9e2c9e51ba
- affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 – < 82b3e7ce10c53fc12aab8904745603efc74f8c07
- affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 – < ede69b8f6670600e534591664584f810d7c385f9
- affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 – < c68517a3e18e20997808821c5559d0cba4d776c1
- affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 – < 5d39580f68e6ddeedd15e587282207489dfb3da2
- affected 2.6.12
- unaffected < 2.6.12
- unaffected 6.1.176 – ≤ 6.1.*
- unaffected 6.6.143 – ≤ 6.6.*
- unaffected 6.12.94 – ≤ 6.12.*
- unaffected 6.18.36 – ≤ 6.18.*
- unaffected 7.0.13 – ≤ 7.0.*
- unaffected 7.1 – ≤ *
References
References9
- https://git.kernel.org/stable/c/3747de241a66ef2c7032d2cc2b826a47c5fa0f6a (opens in a new tab)
- https://git.kernel.org/stable/c/ecfe9171b26ae3eed0cd8bab7a943e9e2c9e51ba (opens in a new tab)
- https://git.kernel.org/stable/c/82b3e7ce10c53fc12aab8904745603efc74f8c07 (opens in a new tab)
- https://git.kernel.org/stable/c/ede69b8f6670600e534591664584f810d7c385f9 (opens in a new tab)
- https://git.kernel.org/stable/c/c68517a3e18e20997808821c5559d0cba4d776c1 (opens in a new tab)
- https://git.kernel.org/stable/c/5d39580f68e6ddeedd15e587282207489dfb3da2 (opens in a new tab)
- https://cert-portal.siemens.com/productcert/html/ssa-019113.html (opens in a new tab)
- https://cert-portal.siemens.com/productcert/html/ssa-457936.html (opens in a new tab)
- https://cert-portal.siemens.com/productcert/html/ssa-784472.html (opens in a new tab)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2026-39327 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2026-53236)Record last updated .