CVE-2026-53227

MEDIUMNVD 5.55.5—
EchelonGraph scoreMEDIUM confidence

Score 5.5 from GitHub Security Advisory published 2026-06-25. NVD baseline CVSS 5.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
5.5EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 5.5Exploit: None knownExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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

net: openvswitch: fix possible kfree_skb of ERR_PTR

After the patch in the "Fixes" tag, the allocation of the "reply" skb can happen either before or after locking the ovs_mutex.

However, error cleanups still follow the classical reversed order, assuming "reply" is allocated before locking: it is freed after unlocking.

If "reply" allocation happens after locking the mutex and it fails, "reply" is left with an ERR_PTR, and execution jumps to the correspondent cleanup stage which will try to free an invalid pointer.

Fix this by setting the pointer to NULL after having saved its error value.

CVSS v3
5.5
EG Score
5.5(medium)
EG Risk
29(Track)
EG Risk 29/100SSVC: 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
Severity55% × 45%
Exploitation0% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
3%
KEV
Not listed

Published

June 25, 2026

Last Modified

July 2, 2026

Advisory Details (8)

Auto-updated Jul 3, 2026
No patch confirmed yet.
generic

net: openvswitch: fix possible kfree_skb of ERR_PTR - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/ee30dd2909d8b98619f4341c70ec8dc8e155ab02
generic

net: openvswitch: fix possible kfree_skb of ERR_PTR - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/ecc55aad3390129a87106841f4b68bf3d70c9264
generic

net: openvswitch: fix possible kfree_skb of ERR_PTR - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/e3d509a1b71396e1452060dbf84a805fd1c3c549
generic

net: openvswitch: fix possible kfree_skb of ERR_PTR - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/e248fb2e680deb2bd37bac551b72638fe4938a76
generic

net: openvswitch: fix possible kfree_skb of ERR_PTR - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/971b1b37774f13acc5add0a2843f8598446b8598
generic

net: openvswitch: fix possible kfree_skb of ERR_PTR - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/895d1dd9057cde1687fa0f4286d47ceed0b82997
generic

net: openvswitch: fix possible kfree_skb of ERR_PTR - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/25fdf53698535fe8790237f5a8a9626791429785
generic

net: openvswitch: fix possible kfree_skb of ERR_PTR - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/0bb5b2dc1b90aa7dd1473fc8c4d813a29255ff8d

Vendor Advisories for CVE-2026-53227(2)

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

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 (145 versions)7.0.13-1—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 5× in last 7d / 61× 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 196 total refreshes for this CVE.

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

Related CVEs(same vendor + same CWE)

Frequently asked(5)

What is CVE-2026-53227?
CVE-2026-53227 is a medium vulnerability published on June 25, 2026. In the Linux kernel, the following vulnerability has been resolved: net: openvswitch: fix possible kfreeskb of ERRPTR After the patch in the "Fixes" tag, the allocation of the "reply" skb can happen either before or after locking the ovs_mutex. However, error cleanups still follow the classical…
When was CVE-2026-53227 disclosed?
CVE-2026-53227 was first published in the National Vulnerability Database on June 25, 2026, with the most recent update on July 2, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-53227 actively exploited?
CVE-2026-53227 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 97.0% of all scored CVEs.
What is the CVSS score of CVE-2026-53227?
CVE-2026-53227 has a CVSS v3 base score of 5.5 (NVD).
How do I remediate CVE-2026-53227?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-53227, 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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