CVE-2026-53249ipv4: restrict IPOPT_SSRR and IPOPT_LSRR options
- 5.5MediumCVSS base score
- 0.13%Exploitation in 30 daysEPSS · top 97% 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: ipv4: restrict IPOPT_SSRR and IPOPT_LSRR options This patch restricts setting Loose Source and Record Route (LSRR) and Strict Source and Record Route (SSRR) IP options to users with CAP_NET_RAW capability. This prevents unprivileged applications from forcing packets to route through attacker-controlled nodes to leak TCP ISN and possibly other protocol information. While LSRR and SSRR are commonly filtered in many network environments, they may still be supported and forwarded along some network paths. RFC 7126 (Recommendations on Filtering of IPv4 Packets Containing IPv4 Options) recommend to drop these options in 4.3 and 4.4.
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 97% of all CVEs (13 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 – < 4cd6e9ed49347d3a2fdaaf07e32fb524756dddc2
- affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 – < 2a87c3e8f03ce655ed0ef500d64d5fd924ec3691
- affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 – < 89343ff12b3178fc236fe531a3603e7c97c68278
- affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 – < 8ff85dbabbbfb05e86e6cde31d91ac5782179d4d
- affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 – < 00e8845fe3428c69e980dce5071cb3da1d8f7578
- affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 – < a4f3fd6516920988c47ba8d19714985c40c816a1
- affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 – < 28f5ad1b4055405eb1616e603fe511ba5e3725e7
- affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 – < d3915a1f5a4bc0ac911032903c3c6ab8df9fcc7c
- affected 2.6.12
- unaffected < 2.6.12
- unaffected 5.10.259 – ≤ 5.10.*
- unaffected 5.15.210 – ≤ 5.15.*
- 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
References11
- https://git.kernel.org/stable/c/4cd6e9ed49347d3a2fdaaf07e32fb524756dddc2 (opens in a new tab)
- https://git.kernel.org/stable/c/2a87c3e8f03ce655ed0ef500d64d5fd924ec3691 (opens in a new tab)
- https://git.kernel.org/stable/c/89343ff12b3178fc236fe531a3603e7c97c68278 (opens in a new tab)
- https://git.kernel.org/stable/c/8ff85dbabbbfb05e86e6cde31d91ac5782179d4d (opens in a new tab)
- https://git.kernel.org/stable/c/00e8845fe3428c69e980dce5071cb3da1d8f7578 (opens in a new tab)
- https://git.kernel.org/stable/c/a4f3fd6516920988c47ba8d19714985c40c816a1 (opens in a new tab)
- https://git.kernel.org/stable/c/28f5ad1b4055405eb1616e603fe511ba5e3725e7 (opens in a new tab)
- https://git.kernel.org/stable/c/d3915a1f5a4bc0ac911032903c3c6ab8df9fcc7c (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-2026-39200 (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-2026-53249)Record last updated .