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

August 17, 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(4)

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-virtual-6.8 (6.8.0-124.124) @ noble2026-08-25ubuntu
ubuntulinux-tools-gcp-64k-6.17 (6.17.0-1018.19) @ questing2026-08-25ubuntu
ubuntulinux-tools-azure-fips-6.8 (6.8.0-1059.65+fips1) @ noble2026-08-25ubuntu
ubuntulinux-tools-azure-edge (6.8.0-1059.65~22.04.1) @ jammy2026-08-25ubuntu
ubuntulinux-tools-oem-7.0 (7.0.0-1008.8) @ resolute2026-08-25ubuntu
ubuntulinux-tools-lowlatency-hwe-20.04-edge (6.8.0-134.134.1) @ noble2026-08-25ubuntu
ubuntulinux-xilinx-zynqmp (6.8.0.1032.33) @ noble2026-08-25ubuntu
ubuntulinux-virtual-hwe-24.04-edge (7.0.0-28.28~24.04.1) @ noble2026-08-25ubuntu
ubuntulinux-virtual-hwe-26.04-edge (7.0.0-22.22) @ resolute2026-08-25ubuntu
ubuntulinux-tools-azure-7.0 (7.0.0-1007.7) @ resolute2026-08-25ubuntu
ubuntulinux-virtual-hwe-24.04-edge (6.17.0-35.35) @ questing2026-08-25ubuntu
redhatkernel-0:6.12.0-55.98.1.el10_02026-08-17redhat
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.

Affected Packages

(2 across 2 ecosystems)
Debian:13(1)
PackageVulnerable rangeFixed inDependents
linux6.12.38-1 ... 6.12.86-1~bpo12+1 (19 versions)6.12.86-1—
Debian:14(1)
PackageVulnerable rangeFixed inDependents
linux6.12.100-1 ... 7.0.4-1~bpo13+1 (131 versions)7.0.4-1—

Weakness Classification(2)

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

Additional Vendor Advisories

(11)

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 5× in last 7d / 89× 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 249 total refreshes for this CVE.

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

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 August 17, 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 96.9% 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.

Dependency Blast Radius

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