CVE-2026-53249

MEDIUMNVD 5.55.5—
EchelonGraph scoreMEDIUM confidence

Score 5.5 from GitHub Security Advisory published 2026-06-25. NVD baseline CVSS 5.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
Trending — 4 sources updated this week
5.5EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 5.5Exploit: None knownExposed: 0

A fix is available — apply it.

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.

CVSS v3
5.5
EG Score
5.5(medium)
EG Risk
29(Track)
EG Risk 29/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity55% × 45%
Exploitation0% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
3%
KEV
Not listed

Published

June 25, 2026

Last Modified

September 8, 2026

Advisory Details (8)

Auto-updated Jul 8, 2026
No patch confirmed yet.
generic

ipv4: restrict IPOPT_SSRR and IPOPT_LSRR options - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/d3915a1f5a4bc0ac911032903c3c6ab8df9fcc7c
generic

ipv4: restrict IPOPT_SSRR and IPOPT_LSRR options - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/a4f3fd6516920988c47ba8d19714985c40c816a1
generic

ipv4: restrict IPOPT_SSRR and IPOPT_LSRR options - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/8ff85dbabbbfb05e86e6cde31d91ac5782179d4d
generic

ipv4: restrict IPOPT_SSRR and IPOPT_LSRR options - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/89343ff12b3178fc236fe531a3603e7c97c68278
generic

ipv4: restrict IPOPT_SSRR and IPOPT_LSRR options - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/4cd6e9ed49347d3a2fdaaf07e32fb524756dddc2
generic

ipv4: restrict IPOPT_SSRR and IPOPT_LSRR options - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/2a87c3e8f03ce655ed0ef500d64d5fd924ec3691
generic

ipv4: restrict IPOPT_SSRR and IPOPT_LSRR options - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/28f5ad1b4055405eb1616e603fe511ba5e3725e7
generic

ipv4: restrict IPOPT_SSRR and IPOPT_LSRR options - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/00e8845fe3428c69e980dce5071cb3da1d8f7578

Vendor Advisories for CVE-2026-53249(2)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Patch Availability(3)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntulinux-virtual-hwe-26.04-edge (7.0.0-31.31) @ resolute2026-09-08ubuntu
ubuntulinux-tools-oem-7.0 (7.0.0-1013.13) @ resolute2026-09-08ubuntu
ubuntulinux-tools-gcp-edge (7.0.0-1011.11~24.04.1) @ noble2026-09-08ubuntu

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Affected Packages

(5 across 4 ecosystems)
Debian:11(2)
PackageVulnerable rangeFixed inDependents
linux5.10.103-1 ... 5.10.92-2 (54 versions)5.10.259-1—
linux-6.16.1.106-3~deb11u1 ... 6.1.174-1~deb11u1 (20 versions)6.1.176-1~deb11u1—
Debian:12(1)
PackageVulnerable rangeFixed inDependents
linux6.1.106-1 ... 6.1.99-1 (53 versions)6.1.176-1—
Debian:13(1)
PackageVulnerable rangeFixed inDependents
linux6.12.38-1 ... 6.12.94-1~bpo12+1 (27 versions)6.12.94-1—
Debian:14(1)
PackageVulnerable rangeFixed inDependents
linux6.12.100-1 ... 7.0.9-1~bpo13+1 (145 versions)7.0.13-1—

Additional Vendor Advisories

(3)

Vendors that published advisories for this CVE beyond the curated set above. Broader coverage but minimal per-row detail — click through for the original advisory.

Data Freshness Timeline

(refreshed 10× in last 7d / 71× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 210 total refreshes for this CVE.

  1. 2026-09-11 14:53 UTCEPSS rescore
  2. 2026-09-10 09:35 UTCEPSS rescore
  3. 2026-09-08 22:01 UTCEPSS rescore
  4. 2026-09-08 09:43 UTCVendor advisory
  5. 2026-09-08 09:43 UTCGHSA enrichment
  6. 2026-09-08 08:58 UTCEG score recompute
  7. 2026-09-08 08:58 UTCVendor advisory
  8. 2026-09-08 08:57 UTCGHSA enrichment
  9. 2026-09-07 16:01 UTCEPSS rescore
  10. 2026-09-06 13:47 UTCEPSS rescore
  11. 2026-09-04 05:06 UTCEPSS rescore
  12. 2026-09-02 14:12 UTCEPSS rescore
  13. 2026-09-01 13:54 UTCEPSS rescore
  14. 2026-09-01 04:40 UTCEPSS rescore
  15. 2026-08-30 19:37 UTCEG score recompute
  16. 2026-08-30 19:37 UTCVendor advisory
  17. 2026-08-30 19:37 UTCGHSA enrichment
  18. 2026-08-30 19:17 UTCEPSS rescore
  19. 2026-08-30 01:22 UTCEPSS rescore
  20. 2026-08-28 21:41 UTCEPSS rescore
  21. 2026-08-27 23:58 UTCEG score recompute
  22. 2026-08-27 23:58 UTCVendor advisory
  23. 2026-08-27 23:58 UTCGHSA enrichment
  24. 2026-08-27 14:25 UTCEPSS rescore
  25. 2026-08-26 14:46 UTCEPSS rescore
Show 75 more
  1. 2026-08-25 13:49 UTCEPSS rescore
  2. 2026-08-25 04:28 UTCEG score recompute
  3. 2026-08-25 04:28 UTCVendor advisory
  4. 2026-08-25 04:28 UTCGHSA enrichment
  5. 2026-08-24 06:47 UTCVendor advisory
  6. 2026-08-24 06:47 UTCGHSA enrichment
  7. 2026-08-23 08:33 UTCEG score recompute
  8. 2026-08-23 08:33 UTCVendor advisory
  9. 2026-08-23 08:33 UTCGHSA enrichment
  10. 2026-08-23 00:19 UTCEPSS rescore
  11. 2026-08-22 10:42 UTCEG score recompute
  12. 2026-08-22 10:42 UTCVendor advisory
  13. 2026-08-22 10:42 UTCGHSA enrichment
  14. 2026-08-21 23:49 UTCEPSS rescore
  15. 2026-08-21 05:09 UTCEG score recompute
  16. 2026-08-21 05:09 UTCVendor advisory
  17. 2026-08-21 05:09 UTCGHSA enrichment
  18. 2026-08-20 22:55 UTCEPSS rescore
  19. 2026-08-20 07:08 UTCEG score recompute
  20. 2026-08-20 07:08 UTCVendor advisory
  21. 2026-08-20 07:07 UTCGHSA enrichment
  22. 2026-08-19 17:04 UTCEPSS rescore
  23. 2026-08-19 01:32 UTCEG score recompute
  24. 2026-08-19 01:32 UTCVendor advisory
  25. 2026-08-19 01:31 UTCGHSA enrichment
  26. 2026-08-18 13:48 UTCEPSS rescore
  27. 2026-08-17 14:02 UTCEG score recompute
  28. 2026-08-17 14:02 UTCGHSA enrichment
  29. 2026-08-17 13:47 UTCEPSS rescore
  30. 2026-08-16 16:21 UTCEG score recompute
  31. 2026-08-16 16:21 UTCVendor advisory
  32. 2026-08-16 16:21 UTCGHSA enrichment
  33. 2026-08-16 14:56 UTCEPSS rescore
  34. 2026-08-16 02:14 UTCEPSS rescore
  35. 2026-08-15 18:40 UTCEG score recompute
  36. 2026-08-15 18:40 UTCVendor advisory
  37. 2026-08-15 18:40 UTCGHSA enrichment
  38. 2026-08-15 01:30 UTCEPSS rescore
  39. 2026-08-14 20:58 UTCVendor advisory
  40. 2026-08-14 20:58 UTCGHSA enrichment
  41. 2026-08-13 23:17 UTCEG score recompute
  42. 2026-08-13 23:17 UTCVendor advisory
  43. 2026-08-13 23:17 UTCGHSA enrichment
  44. 2026-08-13 22:00 UTCEPSS rescore
  45. 2026-08-13 01:35 UTCEG score recompute
  46. 2026-08-13 01:35 UTCGHSA enrichment
  47. 2026-08-12 13:51 UTCEPSS rescore
  48. 2026-08-12 03:54 UTCEG score recompute
  49. 2026-08-12 03:54 UTCVendor advisory
  50. 2026-08-12 03:54 UTCGHSA enrichment
  51. 2026-08-11 06:12 UTCEG score recompute
  52. 2026-08-11 06:12 UTCVendor advisory
  53. 2026-08-11 06:12 UTCGHSA enrichment
  54. 2026-08-11 00:00 UTCEPSS rescore
  55. 2026-08-10 08:30 UTCEG score recompute
  56. 2026-08-10 08:30 UTCGHSA enrichment
  57. 2026-08-09 13:46 UTCEPSS rescore
  58. 2026-08-09 10:49 UTCEG score recompute
  59. 2026-08-09 10:49 UTCVendor advisory
  60. 2026-08-09 10:49 UTCGHSA enrichment
  61. 2026-08-09 10:48 UTCGHSA enrichment
  62. 2026-08-08 16:37 UTCEPSS rescore
  63. 2026-08-08 13:07 UTCEG score recompute
  64. 2026-08-08 13:07 UTCVendor advisory
  65. 2026-08-08 13:07 UTCGHSA enrichment
  66. 2026-08-07 15:25 UTCVendor advisory
  67. 2026-08-07 15:25 UTCGHSA enrichment
  68. 2026-08-06 17:44 UTCEG score recompute
  69. 2026-08-06 17:44 UTCVendor advisory
  70. 2026-08-06 17:44 UTCGHSA enrichment
  71. 2026-08-06 13:47 UTCEPSS rescore
  72. 2026-08-05 20:02 UTCEG score recompute
  73. 2026-08-05 20:02 UTCVendor advisory
  74. 2026-08-05 20:02 UTCGHSA enrichment
  75. 2026-08-05 19:17 UTCEPSS rescore

Related CVEs(same vendor)

Frequently asked(5)

What is CVE-2026-53249?
CVE-2026-53249 is a medium vulnerability published on June 25, 2026. In the Linux kernel, the following vulnerability has been resolved: ipv4: restrict IPOPTSSRR and IPOPTLSRR options This patch restricts setting Loose Source and Record Route (LSRR) and Strict Source and Record Route (SSRR) IP options to users with CAPNETRAW capability. This prevents unprivileged…
When was CVE-2026-53249 disclosed?
CVE-2026-53249 was first published in the National Vulnerability Database on June 25, 2026, with the most recent update on September 8, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-53249 actively exploited?
CVE-2026-53249 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 97.5% of all scored CVEs.
What is the CVSS score of CVE-2026-53249?
CVE-2026-53249 has a CVSS v3 base score of 5.5 (NVD).
How do I remediate CVE-2026-53249?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-53249, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

See which npm, PyPI, Go, and Maven packages are affected by CVE-2026-53249

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