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
9.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.4%CVSS: 9.8Exploit: None knownExposed services: Not assessed

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
9.8CRITICALmedium confidence
EG Risk
49
EG Risk 49/100

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%
EPSS PROB
0.4%
EPSS %ILE
32nd
KEV
Not listed

Published

June 24, 2026

Last Modified

August 5, 2026

Advisory Details (12)

Auto-updated Oct 1, 2026
Patch available.
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(13)

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 / EcosystemFix (by version range) / PatchReleasedSource
ubuntulinux-tools-nvidia-hwe-24.04-edge (7.0.0-1016.16) @ resolute2026-09-23ubuntu
ubuntulinux-xilinx-zynqmp-tools-5.4.0-1080 (5.4.0-1080.84) @ focal2026-09-23ubuntu
ubuntulinux-tools-azure-fips-5.4 (5.4.0.1167.103) @ focal2026-09-23ubuntu
ubuntulinux-tools-azure-edge (4.15.0.1206.221~16.04.1) @ xenial2026-09-23ubuntu
ubuntulinux-tools-aws-fips-5.4 (5.4.0.1163.110) @ focal2026-09-23ubuntu
ubuntulinux-tools-raspi-nolpae (5.15.0.1106.104) @ jammy2026-09-23ubuntu
ubuntulinux-tools-azure-edge (7.0.0-1014.14~24.04.1) @ noble2026-09-23ubuntu
ubuntulinux-tools-gcp-fips-5.4 (5.4.0.1165.107) @ focal2026-09-23ubuntu
ubuntulinux-virtual-hwe-24.04-edge (7.0.0-28.28~24.04.1) @ noble2026-09-23ubuntu
ubuntulinux-virtual-hwe-26.04-edge (7.0.0-28.28) @ resolute2026-09-23ubuntu
ubuntulinux-tools-gcp-fips-6.8 (6.8.0-1064.72+fips1) @ noble2026-09-23ubuntu
ubuntulinux-xilinx-zynqmp-tools-5.15.0-1075 (5.15.0-1075.79) @ jammy2026-09-23ubuntu
ubuntulinux-tools-oracle-7.0 (7.0.0-1008.8) @ resolute2026-09-23ubuntu
ubuntulinux-tools-nvidia-tegra-rt-5.15 (5.15.0.1064.66~20.04.1) @ focal2026-09-23ubuntu
ubuntulinux-tools-oracle-edge (6.8.0-1058.61~22.04.1) @ jammy2026-09-23ubuntu
ubuntulinux-tools-raspi-realtime-7.0 (7.0.0-1015.15) @ resolute2026-09-23ubuntu
ubuntulinux-tools-nvidia-hwe-22.04-edge (6.8.0-1059.62~22.04.1) @ jammy2026-09-23ubuntu
ubuntulinux-tools-aws-edge (5.15.0.1112.119~20.04.1) @ focal2026-09-23ubuntu
ubuntulinux-tools-nvidia-tegra-rt-5.15 (5.15.0.1064.64) @ jammy2026-09-23ubuntu
ubuntulinux-tools-azure-fde-7.0 (7.0.0-1009.9) @ resolute2026-09-23ubuntu
ubuntulinux-tools-aws-lts-24.04 (6.8.0-1061.64+1) @ noble2026-09-23ubuntu
ubuntulinux-tools-azure-fde-lts-24.04 (6.8.0-1062.69) @ noble2026-09-23ubuntu
ubuntulinux-tools-azure-fde-6.8 (6.8.0-1062.69~22.04.1) @ jammy2026-09-23ubuntu
redhatkernel-0:4.18.0-477.168.1.el8_82026-09-22redhat
redhatkernel-0:4.18.0-372.216.1.el8_62026-09-22redhat
redhatkernel-0:4.18.0-305.208.1.el8_42026-09-22redhat
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-0:4.18.0-553.147.1.el8_102026-07-24redhat
redhatkernel-rt-0:4.18.0-553.147.1.rt7.488.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 rangeFix by version rangeDependents
linux5.10.103-1 ... 5.10.92-2 (54 versions)
  • every version up to 5.10.259-1: fixed in 5.10.259-1
—
linux-6.16.1.106-3~deb11u1 ... 6.1.174-1~deb11u1 (20 versions)
  • every version up to 6.1.176-1~deb11u1: fixed in 6.1.176-1~deb11u1
—
Debian:12(1)
PackageVulnerable rangeFix by version rangeDependents
linux6.1.106-1 ... 6.1.99-1 (53 versions)
  • every version up to 6.1.176-1: fixed in 6.1.176-1
—
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
linux6.12.38-1 ... 6.12.94-1~bpo12+1 (27 versions)
  • every version up to 6.12.94-1: fixed in 6.12.94-1
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
linux6.12.100-1 ... 7.0.9-1~bpo13+1 (141 versions)
  • every version up to 7.0.10-1: fixed in 7.0.10-1
—

Weakness Classification(2)

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

Additional Vendor Advisories

(17)

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 / 39× 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 597 total refreshes for this CVE.

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

Related CVEs(same vendor + same CWE)

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 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 0.4% probability of exploitation in the next 30 days (32nd percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-52993?
CVE-2026-52993 has a CVSS base score of 9.8 (the CNA's own assessment, by linux; NVD's own analysis pending).
How do I remediate CVE-2026-52993?
A fix for CVE-2026-52993 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-52993 are linked in the Vendor Advisories panel on this page.

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