CVE-2026-31674

HIGHPre-NVD 7.17.1
EchelonGraph scoreMEDIUM confidence

“—” beside the score: it is equal to the CVSS score beside it.

Score 7.1 from GitHub Security Advisory (severity: HIGH) published 2026-04-25. A secondary CVSS source baseline 7.1; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: EPSS, GitHub Security Advisory, a secondary CVSS source
Trending — 4 sources updated this week
7.1EG
EchelonGraph verdictPlan a fixRemediate within your standard update timelines (the SSVC decision on this page).
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.2%CVSS: 7.1Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

In the Linux kernel, the following vulnerability has been resolved:

netfilter: ip6t_rt: reject oversized addrnr in rt_mt6_check()

Reject rt match rules whose addrnr exceeds IP6T_RT_HOPS.

rt_mt6() expects addrnr to stay within the bounds of rtinfo->addrs[]. Validate addrnr during rule installation so malformed rules are rejected before the match logic can use an out-of-range value.

CVSS v3
7.1
EG Score
7.1HIGHmedium confidence
EG Risk
32
EG Risk 32/100

EG Risk is EchelonGraph's 0–100 priority score. It fuses impact severity (EG Severity, the CVSS base score, never the KEV-floored or EPSS-lifted EG Score) with real-world exploitation and automatability, under weights EchelonGraph set by hand, so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner.

How it’s computed (value × EchelonGraph’s weight)
Severity71% × 45%
Impact severity (EG Severity): CVSS 7.1 of 10. Never the KEV-floored or EPSS-lifted EG Score.
Exploitation0.2% × 40%
FIRST EPSS: the 30-day exploitation probability when EchelonGraph scored this CVE.
Automatability0% × 15%
CISA's SSVC Automatable value: no (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at every mission impact level.
Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE.
Action: A fix is available. Apply it within your standard update timelines.
EPSS PROB
0.2%
EPSS %ILE
6th
KEV
Not listed

What the EG score is made of (scorer v4.0: the three questions the 0–10 score mixes, published apart · methodology)

The EG score (7.1): severity, escalated by confirmed exploitation. This CVE's 7.1 is its impact severity (EG Severity), not escalated.

EG Severity
7.1 HIGHCVSS-B, impact only: no KEV listing, EPSS or EG-KEV tier raises it.GitHub Security Advisory CVSS
EG Likelihood
0.2% within 30 daysSource: FIRST EPSS (model v2026.06.15, score date 2026-10-19). FIRST's exploitation probability, not an EchelonGraph model.
Confirmed exploitation
None on record (CISA KEV, EG-KEV Tier 1)Reported apart from the likelihood: an observed fact, not a probability.
EG Priority
SSVC Track at medium mission impactTrack at every mission impact level.CISA BOD 26-04: 60 days if the affected system is publicly exposed; Fix on system upgrade if it is not.Each input and its source: the SSVC and BOD 26-04 blocks below.

SSVC (CISA's decision table, applied by EchelonGraph)Track at every mission impact level.

A fix is available. Apply it within your standard update timelines.

Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE. Mission impact is CISA's Mission & Well-being decision point, and only you can judge it. CISA's table makes it high when Mission Prevalence is Essential — the vulnerable component "directly provides capabilities that constitute at least one MEF for at least one entity" (MEF: mission essential function) — or when Public Well-Being Impact is Irreversible: "multiple fatalities are likely", the cyber-physical system "is likely lost or destroyed", "extreme or serious externalities" are imposed on other parties, or social systems such as elections or the financial grid "are destabilized and potentially collapse". CISA's decision table

BOD 26-04 (CISA's remediation timeline, Table 1)60 days if the affected system is publicly exposed; Fix on system upgrade if it is not.

In CISA KEV no (CISA's KEV catalog) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Whether your system is publicly exposed is yours to answer. BOD 26-04 binds US Federal Civilian Executive Branch agencies; for anyone else it is CISA's published timeline, a reference rather than an obligation. The directive · how EchelonGraph applies it

Published

April 25, 2026

Last Modified

October 19, 2026

Advisory Details (8)

Auto-updated Jun 12, 2026
Patch available.
Web page

netfilter: ip6t_rt: reject oversized addrnr in rt_mt6_check() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/ded71f5684df16fa645cca5bf4fe6b0cd8a46119
Web page

netfilter: ip6t_rt: reject oversized addrnr in rt_mt6_check() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/d8795fde1f78669a87c87ac29fceab2f104daa8c
Web page

netfilter: ip6t_rt: reject oversized addrnr in rt_mt6_check() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/c6a503a9f4debc654e3a6a7ca1f7fce6a9953c59
Web page

netfilter: ip6t_rt: reject oversized addrnr in rt_mt6_check() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/af9b7e2b765966457f4ec23be5bd34a141f89574
Web page

netfilter: ip6t_rt: reject oversized addrnr in rt_mt6_check() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/a28ebf6f99de270d6338ccdc3b49f3e818f99b7b
Web page

netfilter: ip6t_rt: reject oversized addrnr in rt_mt6_check() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/9d3f027327c2fa265f7f85ead41294792c3296ed
Web page

netfilter: ip6t_rt: reject oversized addrnr in rt_mt6_check() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/29ea965a1353bc8303877422f79c8211e9ba9c55
Web page

netfilter: ip6t_rt: reject oversized addrnr in rt_mt6_check() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/13e3e30ed3b5b67cc1db2bd58a5d09b0f07debfa

Vendor Advisories for CVE-2026-31674(2)

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

Patch Availability(28)

Vendor / EcosystemFix (by version range) / PatchReleasedSource
ubuntulinux-tools-oracle-edge (6.8.0-1058.61~22.04.1) @ jammy2026-10-19ubuntu
ubuntulinux-tools-nvidia-lowlatency-64k-6.8 (6.8.0-1059.62.1) @ noble2026-10-19ubuntu
ubuntulinux-tools-oracle-lts-24.04 (6.8.0-1058.61) @ noble2026-10-19ubuntu
ubuntulinux-tools-nvidia-tegra-rt-5.15 (5.15.0.1064.64) @ jammy2026-10-19ubuntu
ubuntulinux-tools-aws-edge (5.15.0.1112.119~20.04.1) @ focal2026-10-19ubuntu
ubuntulinux-xilinx-zynqmp-tools-5.15.0-1075 (5.15.0-1075.79) @ jammy2026-10-19ubuntu
ubuntulinux-tools-aws-lts-24.04 (6.8.0-1061.64+1) @ noble2026-10-19ubuntu
ubuntulinux-tools-azure-lts-24.04 (6.8.0-1063.71) @ noble2026-10-19ubuntu
ubuntulinux-tools-azure-fde-lts-24.04 (6.8.0-1062.69) @ noble2026-10-19ubuntu
ubuntulinux-tools-azure-fips-6.8 (6.8.0-1063.71+fips2) @ noble2026-10-19ubuntu
ubuntulinux-tools-azure-fde-6.8 (6.8.0-1062.69~22.04.1) @ jammy2026-10-19ubuntu
ubuntulinux-tools-oracle-lts-22.04 (5.15.0.1109.105) @ jammy2026-10-19ubuntu
ubuntulinux-tools-aws-edge (6.8.0-1061.64~22.04.1) @ jammy2026-10-19ubuntu
ubuntulinux-tools-oracle-edge (5.15.0.1109.115~20.04.1) @ focal2026-10-19ubuntu
ubuntulinux-xilinx-zynqmp (6.8.0.1033.34) @ noble2026-10-19ubuntu
ubuntulinux-tools-raspi-realtime-6.8 (6.8.0-2050.52) @ noble2026-10-19ubuntu
ubuntulinux-virtual-6.8 (6.8.0-136.136) @ noble2026-10-19ubuntu
ubuntulinux-tools-gcp-fips-6.8 (6.8.0-1064.72+fips1) @ noble2026-10-19ubuntu
ubuntulinux-tools-nvidia-tegra-rt-5.15 (5.15.0.1064.66~20.04.1) @ focal2026-10-19ubuntu
ubuntulinux-tools-azure-fde-lts-22.04 (5.15.0.1117.126) @ jammy2026-10-19ubuntu
ubuntulinux-tools-ibm-edge (5.15.0.1106.110~20.04.1) @ focal2026-10-19ubuntu
ubuntulinux-tools-azure-fips-5.15 (5.15.0.1117.102) @ jammy2026-10-19ubuntu
ubuntulinux-tools-raspi-nolpae (5.15.0.1106.104) @ jammy2026-10-19ubuntu
ubuntulinux-virtual-hwe-22.04-edge (6.8.0-136.136~22.04.1) @ jammy2026-10-19ubuntu
ubuntulinux-tools-intel-iot-realtime-5.15 (5.15.0.1104.108) @ jammy2026-10-19ubuntu
ubuntulinux-tools-intel-iotg-5.15 (5.15.0.1107.106) @ jammy2026-10-19ubuntu
ubuntulinux-tools-gcp-edge (5.15.0.1112.122~20.04.1) @ focal2026-10-19ubuntu
linuxKernel @ 5.10.253 (fixes >=2.6.12)—osv

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 rangeFix by version rangeDependents
linux5.10.103-1 ... 5.10.92-2 (53 versions)
  • every version up to 5.10.257-1: fixed in 5.10.257-1
—
linux-6.16.1.106-3~deb11u1 ... 6.1.164-1~deb11u1 (16 versions)
  • every version up to 6.1.170-1~deb11u1: fixed in 6.1.170-1~deb11u1
—
Debian:12(1)
PackageVulnerable rangeFix by version rangeDependents
linux6.1.106-1 ... 6.1.99-1 (48 versions)
  • every version up to 6.1.170-1: fixed in 6.1.170-1
—
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
linux6.12.38-1 ... 6.12.85-1~bpo12+1 (17 versions)
  • every version up to 6.12.85-1: fixed in 6.12.85-1
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
linux6.12.100-1 ... 6.19~rc8-1~exp1 (125 versions)
  • every version up to 6.19.11-1: fixed in 6.19.11-1
—

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Additional Vendor Advisories

(24)

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 14× in last 7d / 48× in last 30d)

Each row is a time one of our pipelines fetched, updated or re-scored this CVE. 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. An arrow marks a change the record states ("CVSS v3 → 9.1"); EPSS and GHSA rows show the values recorded at that time, not what changed (EPSS values are rounded; hover one for the exact figures). Most recent first.

Showing the most recent 95 of 308 refreshes on record for this CVE.

A repeat, a row identical to one the same pipeline wrote less than 10 seconds earlier, is not a separate refresh and is not counted. 5 repeat rows among the latest 100 are merged into the row they repeat. The 213 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-10-23 16:31 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  2. 2026-10-22 16:34 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  3. 2026-10-21 16:32 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  4. 2026-10-20 16:33 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  5. 2026-10-19 19:36 UTCEG score recompute
  6. 2026-10-19 19:36 UTCVendor advisory
  7. 2026-10-19 19:35 UTCGHSA enrichmentGHSA-h2wr-h6h5-5qfg · GitHub severity HIGH · GitHub CVSS 7.1
  8. 2026-10-19 19:00 UTCEG score recompute
  9. 2026-10-19 19:00 UTCVendor advisory
  10. 2026-10-19 18:59 UTCGHSA enrichmentGHSA-h2wr-h6h5-5qfg · GitHub severity HIGH · GitHub CVSS 7.1
  11. 2026-10-19 16:31 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  12. 2026-10-18 16:31 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  13. 2026-10-18 03:48 UTCEG score recompute
  14. 2026-10-17 16:34 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  15. 2026-10-16 17:05 UTCEG score recompute
  16. 2026-10-16 17:04 UTCGHSA enrichmentGHSA-h2wr-h6h5-5qfg · GitHub severity HIGH · GitHub CVSS 7.1
  17. 2026-10-16 16:41 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  18. 2026-10-16 15:38 UTCEG score recompute
  19. 2026-10-16 15:38 UTCVendor advisory
  20. 2026-10-16 15:37 UTCGHSA enrichmentGHSA-h2wr-h6h5-5qfg · GitHub severity HIGH · GitHub CVSS 7.1
  21. 2026-10-15 16:31 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  22. 2026-10-15 02:35 UTCEG score recompute
  23. 2026-10-15 02:35 UTCVendor advisory
  24. 2026-10-15 02:34 UTCGHSA enrichmentGHSA-h2wr-h6h5-5qfg · GitHub severity HIGH · GitHub CVSS 7.1
  25. 2026-10-15 01:38 UTCEG score recompute
Show 70 more
  1. 2026-10-15 01:37 UTCGHSA enrichmentGHSA-h2wr-h6h5-5qfg · GitHub severity HIGH · GitHub CVSS 7.1
  2. 2026-10-14 16:32 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  3. 2026-10-13 16:34 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  4. 2026-10-12 16:34 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  5. 2026-10-12 16:15 UTCEG score recompute
  6. 2026-10-11 19:57 UTCEG score recompute
  7. 2026-10-11 17:10 UTCEG score recompute
  8. 2026-10-11 14:39 UTCEG score recompute
  9. 2026-10-11 13:48 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  10. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  11. 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  12. 2026-10-08 17:12 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  13. 2026-10-07 23:47 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  14. 2026-10-06 15:17 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  15. 2026-10-05 17:42 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  16. 2026-10-04 23:22 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  17. 2026-10-03 14:25 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  18. 2026-10-01 19:49 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  19. 2026-09-30 15:03 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  20. 2026-09-28 13:51 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  21. 2026-09-28 00:49 UTCOSV refresh
  22. 2026-09-26 15:58 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  23. 2026-09-26 00:26 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  24. 2026-09-20 20:15 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  25. 2026-09-18 19:27 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  26. 2026-09-17 19:30 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  27. 2026-09-16 14:08 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  28. 2026-09-16 05:15 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  29. 2026-09-13 16:47 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  30. 2026-09-12 15:01 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  31. 2026-09-11 14:52 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  32. 2026-09-10 09:34 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  33. 2026-09-08 22:00 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  34. 2026-09-08 09:04 UTCEG score recompute
  35. 2026-09-08 09:04 UTCVendor advisory
  36. 2026-09-08 09:04 UTCGHSA enrichmentGHSA-h2wr-h6h5-5qfg · GitHub severity HIGH · GitHub CVSS 7.1
  37. 2026-09-07 16:01 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  38. 2026-09-06 13:47 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  39. 2026-09-04 05:06 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  40. 2026-09-04 02:59 UTCOSV refresh
  41. 2026-09-02 14:11 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  42. 2026-09-01 13:53 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  43. 2026-09-01 04:39 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  44. 2026-08-30 19:17 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  45. 2026-08-30 01:22 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  46. 2026-08-28 21:41 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  47. 2026-08-27 14:25 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  48. 2026-08-25 13:49 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  49. 2026-08-24 14:17 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  50. 2026-08-21 23:49 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  51. 2026-08-20 22:55 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  52. 2026-08-19 17:03 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  53. 2026-08-17 14:45 UTCEG score recompute
  54. 2026-08-17 14:45 UTCVendor advisory
  55. 2026-08-17 14:45 UTCGHSA enrichmentGHSA-h2wr-h6h5-5qfg · GitHub severity HIGH · GitHub CVSS 7.1
  56. 2026-08-17 13:47 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  57. 2026-08-16 14:56 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  58. 2026-08-16 05:44 UTCEG score recompute
  59. 2026-08-16 05:44 UTCVendor advisory
  60. 2026-08-16 05:44 UTCGHSA enrichmentGHSA-h2wr-h6h5-5qfg · GitHub severity HIGH · GitHub CVSS 7.1
  61. 2026-08-16 02:14 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  62. 2026-08-15 01:30 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  63. 2026-08-14 15:29 UTCVendor advisory
  64. 2026-08-14 15:29 UTCGHSA enrichmentGHSA-h2wr-h6h5-5qfg · GitHub severity HIGH · GitHub CVSS 7.1
  65. 2026-08-14 04:05 UTCEG score recompute
  66. 2026-08-14 04:05 UTCVendor advisory
  67. 2026-08-14 04:05 UTCGHSA enrichmentGHSA-h2wr-h6h5-5qfg · GitHub severity HIGH · GitHub CVSS 7.1
  68. 2026-08-13 22:00 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  69. 2026-08-13 08:29 UTCVendor advisory
  70. 2026-08-13 08:29 UTCGHSA enrichmentGHSA-h2wr-h6h5-5qfg · GitHub severity HIGH · GitHub CVSS 7.1

Frequently asked(5)

What is CVE-2026-31674?
CVE-2026-31674 is a high-severity vulnerability; its CVE record was published on April 25, 2026. In the Linux kernel, the following vulnerability has been resolved: netfilter: ip6trt: reject oversized addrnr in rtmt6_check() Reject rt match rules whose addrnr exceeds IP6TRTHOPS. rt_mt6() expects addrnr to stay within the bounds of rtinfo->addrs[]. Validate addrnr during rule installation so…
When was the CVE record for CVE-2026-31674 published?
The CVE record for CVE-2026-31674 was published on April 25, 2026. That is the record's publication date; the vulnerability itself may have been made public earlier. EchelonGraph's copy of the record carries a last-modified date of October 19, 2026; the record at its source may have been updated since.
Is CVE-2026-31674 actively exploited?
CVE-2026-31674 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.2% probability of exploitation in the next 30 days (6th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-31674?
CVE-2026-31674 has a CVSS base score of 7.1 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-31674?
A fix for CVE-2026-31674 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-31674 are linked in the Vendor Advisories panel on this page.

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