CVE-2026-52993

CRITICALPre-NVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

Score 9.8 from GitHub Security Advisory (severity: CRITICAL) published 2026-06-24. the CNA's CVSS baseline 9.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cna:linux, epss, ghsa
Trending — 4 sources updated this week
9.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 9.8Exploit: None knownExposed: 0

A fix is available — apply it.

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

tipc: fix double-free in tipc_buf_append()

tipc_msg_validate() can potentially reallocate the skb it is validating, freeing the old one. In tipc_buf_append(), it was being called with a pointer to a local variable which was a copy of the caller's skb pointer.

If the skb was reallocated and validation subsequently failed, the error handling path would free the original skb pointer, which had already been freed, leading to double-free.

Fix this by checking if head now points to a newly allocated reassembled skb. If it does, reassign *headbuf for later freeing operations.

CVSS v3
9.8
EG Score
9.8(medium)
EG Risk
49(Track)
EG Risk 49/100SSVC: 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
Severity98% × 45%
Exploitation0% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
30%
KEV
Not listed

Published

June 24, 2026

Last Modified

August 5, 2026

Advisory Details (12)

Auto-updated Aug 19, 2026
No patch confirmed yet.
generic

tipc: fix double-free in tipc_buf_append() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/d293ca716e7d5dffdaecaf6b9b2f857a33dc3d3a
generic

tipc: fix double-free in tipc_buf_append() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/29940fff14110ca48c5ccc168d121665b51bb778
generic

tipc: fix double-free in tipc_buf_append() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/1d5e589055880fae229e229e1929e087dbe08cf3
generic

tipc: fix double-free in tipc_buf_append() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/4d104882bc815d4ec666ace9155f5f52715879a6
generic

tipc: fix double-free in tipc_buf_append() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/0274f24485fc38032d4093e463dc3ff5c7a667c9
generic

tipc: fix double-free in tipc_buf_append() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/d3556656c6daebf8def751c7e71d11dd0a180d24
generic

tipc: fix double-free in tipc_buf_append() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/4ee4deadaae7cb2e3d53af0fc889cf92a73413c0
generic

tipc: fix double-free in tipc_buf_append() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/a438975a6dcdbd70865978c021650d1485586f0b
redhat Patch Available

Affected: Red Hat Enterprise Linux 8.

https://access.redhat.com/errata/RHSA-2026:45116
redhat Patch Available

Affected: Red Hat Enterprise Linux 8.10 Extended Update Support.

https://access.redhat.com/errata/RHSA-2026:45115
redhat Patch Available

cve-details

https://access.redhat.com/security/cve/CVE-2026-52993
redhat

2492437 – (CVE-2026-52993) CVE-2026-52993 kernel: tipc: fix double-free in tipc_buf_append()

https://bugzilla.redhat.com/show_bug.cgi?id=2492437

Vendor Advisories for CVE-2026-52993(6)

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

Patch Availability(30)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntulinux-tools-oracle-edge (6.8.0-1058.61~22.04.1) @ jammy2026-08-20ubuntu
ubuntulinux-tools-nvidia-lowlatency-5.15 (5.15.0.1107.107) @ jammy2026-08-20ubuntu
ubuntulinux-virtual-hwe-26.04-edge (7.0.0-28.28) @ resolute2026-08-20ubuntu
ubuntulinux-virtual-6.8 (6.8.0-136.136) @ noble2026-08-20ubuntu
ubuntulinux-virtual-hwe-24.04-edge (7.0.0-28.28~24.04.1) @ noble2026-08-20ubuntu
ubuntulinux-xilinx-zynqmp-tools-5.15.0-1075 (5.15.0-1075.79) @ jammy2026-08-20ubuntu
ubuntulinux-tools-azure-fips-5.15 (5.15.0.1117.102) @ jammy2026-08-20ubuntu
ubuntulinux-tools-intel-iot-realtime-5.15 (5.15.0.1104.108) @ jammy2026-08-20ubuntu
ubuntulinux-virtual-hwe-16.04-edge (4.15.0.257.269~16.04.1) @ xenial2026-08-20ubuntu
ubuntulinux-tools-azure-fde-lts-24.04 (6.8.0-1062.69) @ noble2026-08-20ubuntu
ubuntulinux-tools-gcp-fips-6.8 (6.8.0-1064.72+fips1) @ noble2026-08-20ubuntu
ubuntulinux-tools-oracle (4.15.0.1158.169~16.04.1) @ xenial2026-08-20ubuntu
ubuntulinux-tools-nvidia-lowlatency-64k-6.8 (6.8.0-1059.62.1) @ noble2026-08-20ubuntu
ubuntulinux-tools-nvidia-tegra-rt-5.15 (5.15.0.1064.64) @ jammy2026-08-20ubuntu
ubuntulinux-tools-azure-fde-7.0 (7.0.0-1009.9) @ resolute2026-08-20ubuntu
ubuntulinux-tools-aws-lts-24.04 (6.8.0-1061.64+1) @ noble2026-08-20ubuntu
ubuntulinux-tools-azure-lts-24.04 (6.8.0-1063.71) @ noble2026-08-20ubuntu
ubuntulinux-tools-oracle-lts-22.04 (5.15.0.1109.105) @ jammy2026-08-20ubuntu
ubuntulinux-tools-azure-fde-lts-22.04 (5.15.0.1117.126) @ jammy2026-08-20ubuntu
ubuntulinux-tools-raspi-realtime-7.0 (7.0.0-1015.15) @ resolute2026-08-20ubuntu
ubuntulinux-tools-aws-edge (6.8.0-1061.64~22.04.1) @ jammy2026-08-20ubuntu
ubuntulinux-tools-ibm-edge (6.8.0-1061.62~22.04.1) @ jammy2026-08-20ubuntu
ubuntulinux-virtual-hwe-22.04-edge (6.8.0-136.136~22.04.1) @ jammy2026-08-20ubuntu
ubuntulinux-tools-oracle-edge (5.15.0.1109.115~20.04.1) @ focal2026-08-20ubuntu
ubuntulinux-tools-intel-iotg-5.15 (5.15.0.1107.106) @ jammy2026-08-20ubuntu
ubuntulinux-tools-azure-fips-6.8 (6.8.0-1063.71+fips2) @ noble2026-08-20ubuntu
redhatkernel-0:5.14.0-687.33.1.el9_82026-07-31redhat
redhatkernel-0:6.12.0-211.40.1.el10_22026-07-28redhat
redhatkernel-rt-0:4.18.0-553.147.1.rt7.488.el8_102026-07-24redhat
redhatkernel-0:4.18.0-553.147.1.el8_102026-07-24redhat

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 rangeFixed inDependents
linux5.10.103-1 ... 5.10.92-2 (54 versions)5.10.259-1—
linux-6.16.1.106-3~deb11u1 ... 6.1.174-1~deb11u1 (20 versions)6.1.176-1~deb11u1—
Debian:12(1)
PackageVulnerable rangeFixed inDependents
linux6.1.106-1 ... 6.1.99-1 (53 versions)6.1.176-1—
Debian:13(1)
PackageVulnerable rangeFixed inDependents
linux6.12.38-1 ... 6.12.94-1~bpo12+1 (27 versions)6.12.94-1—
Debian:14(1)
PackageVulnerable rangeFixed inDependents
linux6.12.100-1 ... 7.0.9-1~bpo13+1 (137 versions)7.0.10-1—

Weakness Classification(2)

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

Additional Vendor Advisories

(20)

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 72× in last 7d / 316× 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 488 total refreshes for this CVE.

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

Frequently asked(5)

What is CVE-2026-52993?
CVE-2026-52993 is a critical vulnerability published on June 24, 2026. In the Linux kernel, the following vulnerability has been resolved: tipc: fix double-free in tipcbufappend() tipcmsgvalidate() can potentially reallocate the skb it is validating, freeing the old one. In tipcbufappend(), it was being called with a pointer to a local variable which was a copy of the…
When was CVE-2026-52993 disclosed?
CVE-2026-52993 was first published in the National Vulnerability Database on June 24, 2026, with the most recent update on August 5, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-52993 actively exploited?
CVE-2026-52993 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 70.0% of all scored CVEs.
What is the CVSS score of CVE-2026-52993?
CVE-2026-52993 has a CVSS v4.0 base score of 9.8 (CNA self-assessment; NVD's own analysis pending).
How do I remediate CVE-2026-52993?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-52993, 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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