CVE-2026-53363

CRITICALPre-NVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

Score 9.8 from GitHub Security Advisory (severity: CRITICAL) published 2026-07-10. the CNA's CVSS baseline 9.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cna:linux, epss, ghsa
Trending — 3 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

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:

xfrm: iptfs: preserve shared-frag marker in iptfs_consume_frags()

iptfs_consume_frags() transfers paged fragments from one socket buffer to another but fails to propagate the SKBFL_SHARED_FRAG flag. This is the same class of bug that was fixed in skb_try_coalesce() for CVE-2026-46300: when fragments backed by read-only page-cache pages are merged, the marker indicating their shared nature must be preserved so that ESP can decide correctly whether in-place encryption is safe.

Apply the same two-line fix used in skb_try_coalesce() to iptfs_consume_frags().

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
34%
KEV
Not listed

Published

July 10, 2026

Last Modified

August 5, 2026

Advisory Details (3)

Auto-updated Aug 26, 2026
No patch confirmed yet.
generic

xfrm: iptfs: preserve shared-frag marker in iptfs_consume_frags() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/e9096a5a170e7ecd6467bc2e08668ec39897cda7
generic

xfrm: iptfs: preserve shared-frag marker in iptfs_consume_frags() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/c885d111ed9f5a0a1f3cc4e87a50db6518abaa6c
generic

xfrm: iptfs: preserve shared-frag marker in iptfs_consume_frags() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/dd66f7f6e360ee82cd905517726f8e9091265de5

Vendor Advisories for CVE-2026-53363(1)

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

Affected Packages

(1 across 1 ecosystem)
Debian:14(1)
PackageVulnerable rangeFixed inDependents
linux6.12.100-1 ... 7.0.9-1~bpo13+1 (142 versions)7.0.13-1—

Data Freshness Timeline

(refreshed 30× in last 7d / 209× 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 366 total refreshes for this CVE.

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

Frequently asked(5)

What is CVE-2026-53363?
CVE-2026-53363 is a critical vulnerability published on July 10, 2026. In the Linux kernel, the following vulnerability has been resolved: xfrm: iptfs: preserve shared-frag marker in iptfsconsumefrags() iptfsconsumefrags() transfers paged fragments from one socket buffer to another but fails to propagate the SKBFLSHAREDFRAG flag. This is the same class of bug that was…
When was CVE-2026-53363 disclosed?
CVE-2026-53363 was first published in the National Vulnerability Database on July 10, 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-2026-53363 actively exploited?
CVE-2026-53363 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 65.9% of all scored CVEs.
What is the CVSS score of CVE-2026-53363?
CVE-2026-53363 has a CVSS v4.0 base score of 9.8 (CNA self-assessment; NVD's own analysis pending).
How do I remediate CVE-2026-53363?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-53363, 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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