CVE-2026-45998

HIGHNVD 7.87.8—
EchelonGraph scoreMEDIUM confidence

Score 7.8 from GitHub Security Advisory (severity: HIGH) published 2026-05-27. NVD baseline CVSS 7.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
7.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 7.8Exploit: None knownExposed: 0

A fix is available — apply it.

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

rxrpc: Fix potential UAF after skb_unshare() failure

If skb_unshare() fails to unshare a packet due to allocation failure in rxrpc_input_packet(), the skb pointer in the parent (rxrpc_io_thread()) will be NULL'd out. This will likely cause the call to trace_rxrpc_rx_done() to oops.

Fix this by moving the unsharing down to where rxrpc_input_call_event() calls rxrpc_input_call_packet(). There are a number of places prior to that where we ignore DATA packets for a variety of reasons (such as the call already being complete) for which an unshare is then avoided.

And with that, rxrpc_input_packet() doesn't need to take a pointer to the pointer to the packet, so change that to just a pointer.

CVSS v3
7.8
EG Score
7.8(medium)
EG Risk
40(Track)
EG Risk 40/100SSVC: 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
Severity78% × 45%
Exploitation0% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
3%
KEV
Not listed

Published

May 27, 2026

Last Modified

July 15, 2026

Advisory Details (5)

Auto-updated Jun 16, 2026
No patch confirmed yet.
generic

rxrpc: Fix potential UAF after skb_unshare() failure - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/e3bf143b1e98fb3d6d9e6825bcd683974d478e8c
generic

rxrpc: Fix potential UAF after skb_unshare() failure - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/bf20f46d94f1db38e6ffc0ca204a5fe0de01b495
generic

rxrpc: Fix potential UAF after skb_unshare() failure - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/996b0487b3cdda4c91811dbb1c9564626bc840bd
generic

rxrpc: Fix potential UAF after skb_unshare() failure - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/8fde6296c4d4da2be7ab761305ab7f232b94eefd
generic

rxrpc: Fix potential UAF after skb_unshare() failure - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/1f2740150f904bfa60e4bad74d65add3ccb5e7f8

Vendor Advisories for CVE-2026-45998(3)

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

Patch Availability(11)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntulinux-virtual-hwe-24.04-edge (6.17.0-35.35) @ questing2026-07-11ubuntu
ubuntulinux-virtual-6.8 (6.8.0-124.124) @ noble2026-07-11ubuntu
ubuntulinux-tools-gcp-64k-6.17 (6.17.0-1018.19) @ questing2026-07-11ubuntu
ubuntulinux-tools-azure-fips-6.8 (6.8.0-1059.65+fips1) @ noble2026-07-11ubuntu
ubuntulinux-tools-azure-edge (6.8.0-1059.65~22.04.1) @ jammy2026-07-11ubuntu
ubuntulinux-tools-oem-7.0 (7.0.0-1008.8) @ resolute2026-07-11ubuntu
ubuntulinux-tools-lowlatency-hwe-20.04-edge (6.8.0-134.134.1) @ noble2026-07-11ubuntu
ubuntulinux-xilinx-zynqmp (6.8.0.1032.33) @ noble2026-07-11ubuntu
ubuntulinux-virtual-hwe-26.04-edge (7.0.0-22.22) @ resolute2026-07-11ubuntu
ubuntulinux-tools-azure-7.0 (7.0.0-1007.7) @ resolute2026-07-11ubuntu
redhatkernel-0:6.12.0-211.30.1.el10_22026-07-02redhat

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.

Weakness Classification(2)

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

Additional Vendor Advisories

(10)

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 9× in last 7d / 49× 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 125 total refreshes for this CVE.

  1. 2026-07-26 14:54 UTCEPSS rescore
  2. 2026-07-26 14:54 UTCEPSS rescore
  3. 2026-07-25 14:18 UTCEPSS rescore
  4. 2026-07-24 14:17 UTCEPSS rescore
  5. 2026-07-23 14:18 UTCEPSS rescore
  6. 2026-07-23 03:16 UTCEG score recompute
  7. 2026-07-22 14:08 UTCEPSS rescore
  8. 2026-07-21 15:24 UTCEPSS rescore
  9. 2026-07-20 17:08 UTCEPSS rescore
  10. 2026-07-19 14:31 UTCEPSS rescore
  11. 2026-07-19 02:29 UTCEPSS rescore
  12. 2026-07-18 10:04 UTCEPSS rescore
  13. 2026-07-16 17:03 UTCEPSS rescore
  14. 2026-07-15 16:57 UTCEPSS rescore
  15. 2026-07-15 02:25 UTCNVD updateCVSS v3 → 7.8
  16. 2026-07-15 01:21 UTCMITRE cvelistV5CVSS v3 → 7
  17. 2026-07-13 22:30 UTCEPSS rescore
  18. 2026-07-13 06:13 UTCEPSS rescore
  19. 2026-07-12 05:46 UTCEPSS rescore
  20. 2026-07-11 23:55 UTCVendor advisory
  21. 2026-07-11 23:54 UTCGHSA enrichment
  22. 2026-07-11 08:27 UTCEPSS rescore
  23. 2026-07-09 19:10 UTCEPSS rescore
  24. 2026-07-09 00:01 UTCVendor advisory
  25. 2026-07-09 00:01 UTCGHSA enrichment
Show 75 more
  1. 2026-07-08 15:16 UTCEPSS rescore
  2. 2026-07-07 13:46 UTCEPSS rescore
  3. 2026-07-06 16:27 UTCEPSS rescore
  4. 2026-07-06 02:23 UTCEPSS rescore
  5. 2026-07-05 02:30 UTCEPSS rescore
  6. 2026-07-04 06:31 UTCEPSS rescore
  7. 2026-07-01 10:50 UTCVendor advisory
  8. 2026-07-01 10:49 UTCGHSA enrichment
  9. 2026-06-30 23:22 UTCEPSS rescore
  10. 2026-06-30 03:56 UTCVendor advisory
  11. 2026-06-30 03:55 UTCGHSA enrichment
  12. 2026-06-29 14:25 UTCVendor advisory
  13. 2026-06-29 14:24 UTCGHSA enrichment
  14. 2026-06-29 14:06 UTCEPSS rescore
  15. 2026-06-29 14:06 UTCEPSS rescore
  16. 2026-06-28 22:07 UTCVendor advisory
  17. 2026-06-28 22:07 UTCGHSA enrichment
  18. 2026-06-28 14:07 UTCEPSS rescore
  19. 2026-06-28 08:56 UTCVendor advisory
  20. 2026-06-28 08:55 UTCGHSA enrichment
  21. 2026-06-28 04:56 UTCEPSS rescore
  22. 2026-06-28 04:56 UTCEPSS rescore
  23. 2026-06-27 19:48 UTCVendor advisory
  24. 2026-06-27 19:48 UTCGHSA enrichment
  25. 2026-06-27 06:33 UTCVendor advisory
  26. 2026-06-27 06:33 UTCGHSA enrichment
  27. 2026-06-27 03:08 UTCEPSS rescore
  28. 2026-06-26 17:10 UTCVendor advisory
  29. 2026-06-26 17:10 UTCGHSA enrichment
  30. 2026-06-26 03:40 UTCVendor advisory
  31. 2026-06-26 03:40 UTCGHSA enrichment
  32. 2026-06-25 14:33 UTCVendor advisory
  33. 2026-06-25 14:32 UTCGHSA enrichment
  34. 2026-06-25 13:49 UTCEPSS rescore
  35. 2026-06-25 01:25 UTCVendor advisory
  36. 2026-06-25 01:24 UTCGHSA enrichment
  37. 2026-06-24 14:05 UTCEPSS rescore
  38. 2026-06-23 21:33 UTCEPSS rescore
  39. 2026-06-23 21:33 UTCEPSS rescore
  40. 2026-06-22 14:25 UTCEPSS rescore
  41. 2026-06-22 14:25 UTCEPSS rescore
  42. 2026-06-21 14:56 UTCEPSS rescore
  43. 2026-06-21 14:56 UTCEPSS rescore
  44. 2026-06-21 01:59 UTCEPSS rescore
  45. 2026-06-21 01:59 UTCEPSS rescore
  46. 2026-06-19 19:26 UTCEPSS rescore
  47. 2026-06-19 19:26 UTCEPSS rescore
  48. 2026-06-18 17:52 UTCEPSS rescore
  49. 2026-06-18 17:52 UTCEPSS rescore
  50. 2026-06-17 21:26 UTCVendor advisory
  51. 2026-06-17 21:25 UTCGHSA enrichment
  52. 2026-06-17 17:53 UTCEPSS rescore
  53. 2026-06-17 08:16 UTCEG score recompute▲ 7.80
  54. 2026-06-17 08:16 UTCVendor advisory
  55. 2026-06-17 08:16 UTCGHSA enrichment
  56. 2026-06-16 17:52 UTCEPSS rescore
  57. 2026-06-16 13:46 UTCNVD updateCVSS v3 → 7.8 · severity → HIGH
  58. 2026-06-15 17:49 UTCEPSS rescore
  59. 2026-06-14 23:28 UTCMITRE cvelistV5
  60. 2026-06-14 15:09 UTCVendor advisory
  61. 2026-06-14 15:09 UTCGHSA enrichment
  62. 2026-06-13 23:00 UTCEPSS rescore
  63. 2026-06-12 23:12 UTCEPSS rescore
  64. 2026-06-12 23:12 UTCEPSS rescore
  65. 2026-06-11 22:02 UTCVendor advisory
  66. 2026-06-11 22:02 UTCGHSA enrichment
  67. 2026-06-11 14:00 UTCEPSS rescore
  68. 2026-06-10 22:18 UTCEPSS rescore
  69. 2026-06-10 13:22 UTCEPSS rescore
  70. 2026-06-10 13:22 UTCEPSS rescore
  71. 2026-06-09 04:56 UTCVendor advisory
  72. 2026-06-09 04:56 UTCGHSA enrichment
  73. 2026-06-08 14:17 UTCEPSS rescore
  74. 2026-06-08 14:17 UTCEPSS rescore
  75. 2026-06-07 15:25 UTCEPSS rescore

Related CVEs(same vendor + same CWE)

Frequently asked(5)

What is CVE-2026-45998?
CVE-2026-45998 is a high vulnerability published on May 27, 2026. In the Linux kernel, the following vulnerability has been resolved: rxrpc: Fix potential UAF after skb_unshare() failure If skb_unshare() fails to unshare a packet due to allocation failure in rxrpcinputpacket(), the skb pointer in the parent (rxrpciothread()) will be NULL'd out. This will likely…
When was CVE-2026-45998 disclosed?
CVE-2026-45998 was first published in the National Vulnerability Database on May 27, 2026, with the most recent update on July 15, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-45998 actively exploited?
CVE-2026-45998 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 97.1% of all scored CVEs.
What is the CVSS score of CVE-2026-45998?
CVE-2026-45998 has a CVSS v3 base score of 7.8 (NVD).
How do I remediate CVE-2026-45998?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-45998, 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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