CVE-2026-45905

MEDIUMNVD 4.74.7—
EchelonGraph scoreMEDIUM confidence

Score 4.7 from GitHub Security Advisory published 2026-05-27. NVD baseline CVSS 4.7; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
Trending — 5 sources updated this week
4.7EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 4.7Exploit: None knownExposed: 0

A fix is available — apply it.

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

xfrm: fix ip_rt_bug race in icmp_route_lookup reverse path

icmp_route_lookup() performs multiple route lookups to find a suitable route for sending ICMP error messages, with special handling for XFRM (IPsec) policies.

The lookup sequence is:

  • First, lookup output route for ICMP reply (dst = original src)
  • Pass through xfrm_lookup() for policy check
  • If blocked (-EPERM) or dst is not local, enter "reverse path"
  • In reverse path, call xfrm_decode_session_reverse() to get fl4_dec
which reverses the original packet's flow (saddr<->daddr swapped)
  • If fl4_dec.saddr is local (we are the original destination), use
__ip_route_output_key() for output route lookup
  • If fl4_dec.saddr is NOT local (we are a forwarding node), use
ip_route_input() to simulate the reverse packet's input path
  • Finally, pass rt2 through xfrm_lookup() with XFRM_LOOKUP_ICMP flag

The bug occurs in step 6: ip_route_input() is called with fl4_dec.daddr (original packet's source) as destination. If this address becomes local between the initial check and ip_route_input() call (e.g., due to concurrent "ip addr add"), ip_route_input() returns a LOCAL route with dst.output set to ip_rt_bug.

This route is then used for ICMP output, causing dst_output() to call ip_rt_bug(), triggering a WARN_ON:

------------[ cut here ]------------ WARNING: net/ipv4/route.c:1275 at ip_rt_bug+0x21/0x30, CPU#1 Call Trace: ip_push_pending_frames+0x202/0x240 icmp_push_reply+0x30d/0x430 __icmp_send+0x1149/0x24f0 ip_options_compile+0xa2/0xd0 ip_rcv_finish_core+0x829/0x1950 ip_rcv+0x2d7/0x420 __netif_receive_skb_one_core+0x185/0x1f0 netif_receive_skb+0x90/0x450 tun_get_user+0x3413/0x3fb0 tun_chr_write_iter+0xe4/0x220 ...

Fix this by checking rt2->rt_type after ip_route_input(). If it's RTN_LOCAL, the route cannot be used for output, so treat it as an error.

The reproducer requires kernel modification to widen the race window, making it unsuitable as a selftest. It is available at:

https://gist.github.com/mrpre/eae853b72ac6a750f5d45d64ddac1e81

CVSS v3
4.7
EG Score
4.7(medium)
EG Risk
26(Track)
EG Risk 26/100SSVC: 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
Severity47% × 45%
Exploitation0% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
2%
KEV
Not listed

Published

May 27, 2026

Last Modified

June 24, 2026

Advisory Details (6)

Auto-updated Jun 24, 2026
No patch confirmed yet.
generic

xfrm: fix ip_rt_bug race in icmp_route_lookup reverse path - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/b04061f89ffc6168e7ec3c71d0086ec3c3797228
generic

xfrm: fix ip_rt_bug race in icmp_route_lookup reverse path - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/9a95ec9144eeff1fc6fbcc21b677e322c6f1430b
generic

xfrm: fix ip_rt_bug race in icmp_route_lookup reverse path - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/81b84de32bb27ae1ae2eb9acf0420e9d0d14bf00
generic

xfrm: fix ip_rt_bug race in icmp_route_lookup reverse path - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/423ce12d10b426709489d6b84fdaa6d2f31c5652
generic

xfrm: fix ip_rt_bug race in icmp_route_lookup reverse path - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/2c1f59005da9dd4b07b26984fd719e36557dc57c
generic

xfrm: fix ip_rt_bug race in icmp_route_lookup reverse path - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/1c9ef28f643cce34a6a6c36c8f4d6d60a60db7e1

Vendor Advisories for CVE-2026-45905(1)

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

Patch Availability(13)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntulinux-tools-raspi-6.8 (6.8.0-1060.64) @ noble2026-09-14ubuntu
ubuntulinux-tools-fips-6.8 (6.8.0-134.134+fips1) @ noble2026-09-14ubuntu
ubuntulinux-tools-azure-lts-24.04 (6.8.0-1063.71) @ noble2026-09-14ubuntu
ubuntulinux-tools-azure-fde-lts-24.04 (6.8.0-1062.69) @ noble2026-09-14ubuntu
ubuntulinux-tools-azure-fde-6.8 (6.8.0-1062.69~22.04.1) @ jammy2026-09-14ubuntu
ubuntulinux-virtual-hwe-22.04-edge (6.8.0-136.136~22.04.1) @ jammy2026-09-14ubuntu
ubuntulinux-tools-realtime-hwe-22.04 (6.8.1-1055.56~22.04.1) @ jammy2026-09-14ubuntu
ubuntulinux-tools-nvidia-lowlatency-64k-6.8 (6.8.0-1058.61.1) @ noble2026-09-14ubuntu
ubuntulinux-tools-lowlatency-hwe-20.04-edge (6.8.0-134.134.1) @ noble2026-09-14ubuntu
ubuntulinux-tools-nvidia-tegra-rt-6.8 (6.8.0-1029.30) @ noble2026-09-14ubuntu
ubuntulinux-xilinx-zynqmp (6.8.0.1032.33) @ noble2026-09-14ubuntu
ubuntulinux-tools-raspi-realtime-6.8 (6.8.0-2049.50) @ noble2026-09-14ubuntu
linuxKernel @ 6.1.165—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

(4 across 4 ecosystems)
Debian:11(1)
PackageVulnerable rangeFixed inDependents
linux5.10.103-1 ... 7.2~rc5-1~exp1 (496 versions)——
Debian:12(1)
PackageVulnerable rangeFixed inDependents
linux6.1.106-1 ... 6.1.99-1 (48 versions)6.1.170-1—
Debian:13(1)
PackageVulnerable rangeFixed inDependents
linux6.12.38-1 ... 6.12.85-1~bpo12+1 (17 versions)6.12.85-1—
Debian:14(1)
PackageVulnerable rangeFixed inDependents
linux6.12.100-1 ... 6.18~rc7-1~exp1 (103 versions)6.18.14-1—

Weakness Classification(1)

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

All Vendor Advisories

(12)

Every vendor that published an advisory referencing this CVE — pulled from our cve_vendor_advisories aggregation. Click any row for the vendor's original advisory page.

Data Freshness Timeline

(refreshed 10× in last 7d / 41× 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 196 total refreshes for this CVE.

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

Frequently asked(5)

What is CVE-2026-45905?
CVE-2026-45905 is a medium vulnerability published on May 27, 2026. In the Linux kernel, the following vulnerability has been resolved: xfrm: fix iprtbug race in icmproutelookup reverse path icmproutelookup() performs multiple route lookups to find a suitable route for sending ICMP error messages, with special handling for XFRM (IPsec) policies. The lookup sequence…
When was CVE-2026-45905 disclosed?
CVE-2026-45905 was first published in the National Vulnerability Database on May 27, 2026, with the most recent update on June 24, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-45905 actively exploited?
CVE-2026-45905 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 98.5% of all scored CVEs.
What is the CVSS score of CVE-2026-45905?
CVE-2026-45905 has a CVSS v3 base score of 4.7 (NVD).
How do I remediate CVE-2026-45905?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-45905, 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.

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