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
7.8
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 0%CVSS: 7.8Exploit: NoneExposed: 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
—
EPSS
2.9%
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 7× in last 7d / 58× 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 119 total refreshes for this CVE.

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

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 2.9% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
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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