CVE-2026-93798

HIGHPre-NVD 7.87.8—
EchelonGraph scoreHIGH confidence

Score 7.8 from GitHub Security Advisory (severity: HIGH) published 2026-09-24. A secondary CVSS source baseline 7.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this week
7.8EG
EchelonGraph verdictPlan mitigationSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.1%CVSS: 7.8Exploit: None knownExposed services: Not assessed

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

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

btrfs: fix reloc root cleanup in merge_reloc_roots()

If the root we got has zero root refs in its root item, we are resetting the root's ->reloc_root without using barriers like we do everywhere else. Sashiko complained about this while reviewing another patch, and it's correct (see the Link tag below).

Also, we should not clear BTRFS_ROOT_DEAD_RELOC_TREE from the root unless the root points to the reloc root we have.

Fix this by using clear_reloc_root(), which issues the memory barrier after setting the root's ->reloc_root to NULL and before clearing the bit BTRFS_ROOT_DEAD_RELOC_TREE from the root.

CVSS v3
7.8
EG Score
7.8HIGHhigh confidence
EG Risk
40
EG Risk 40/100CISA SSVC

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%
CISA SSVC: Track at low or medium mission impact; Track or Attend at high (mission-essential systems).
Action: No fix is confirmed yet. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines at low or medium mission impact and sooner than that at high, and watch the vendor's advisory for the fix.
EPSS PROB
0.1%
EPSS %ILE
2nd
KEV
Not listed

CISA SSVCTrack at low or medium mission impact; Track or Attend at high (mission-essential systems).

No fix is confirmed yet. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines at low or medium mission impact and sooner than that at high, and watch the vendor's advisory for the fix.

Exploitation none (no KEV listing, exploit record or EPSS ≥ 50%) · Automatable unknown (not published for this CVE) · Technical impact partial (CVSS below 9.0). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

September 24, 2026

Last Modified

October 3, 2026

Advisory Details (3)

Auto-updated Sep 25, 2026
No patch confirmed yet.
generic

btrfs: fix reloc root cleanup in merge_reloc_roots() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/b78fe9563e2d5ae47805f1e5dc722c91fd30e1f8
generic

btrfs: fix reloc root cleanup in merge_reloc_roots() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/ab48583aa9948205ff9a6470e23dbff74c565e24
generic

btrfs: fix reloc root cleanup in merge_reloc_roots() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/63d6b1f04cd91c825329712aa526215ffa5d11ca

Vendor Advisories for CVE-2026-93798(2)

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

Affected Packages

(4 across 3 ecosystems)
Debian:12(2)
PackageVulnerable rangeFix by version rangeDependents
linux6.1.106-1 ... 7.2~rc7-1~exp1 (360 versions)
  • every version on: no fix on record
—
linux-6.126.12.100-1~deb12u1, 6.12.101-1~deb12u1, 6.12.107-1~deb12u1
  • every version up to 6.12.111-1~deb12u1: fixed in 6.12.111-1~deb12u1
—
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
linux6.12.100-1 ... 6.12.96-1 (35 versions)
  • every version up to 6.12.111-1: fixed in 6.12.111-1
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
linux6.12.100-1 ... 7.2~rc7-1~exp1 (179 versions)
  • every version up to 7.2.6-1: fixed in 7.2.6-1
—

Data Freshness Timeline

(refreshed 27× in last 7d / 47× 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.

  1. 2026-10-05 03:06 UTCEG score recompute
  2. 2026-10-05 03:06 UTCGHSA enrichment
  3. 2026-10-04 23:23 UTCEPSS rescore
  4. 2026-10-04 13:55 UTCGHSA enrichment
  5. 2026-10-04 00:43 UTCEG score recompute
  6. 2026-10-04 00:43 UTCGHSA enrichment
  7. 2026-10-03 14:26 UTCEPSS rescore
  8. 2026-10-03 11:32 UTCGHSA enrichment
  9. 2026-10-03 07:07 UTCEG score recompute
  10. 2026-10-03 07:07 UTCGHSA enrichment
  11. 2026-10-02 17:55 UTCGHSA enrichment
  12. 2026-10-02 04:44 UTCEG score recompute
  13. 2026-10-02 04:44 UTCGHSA enrichment
  14. 2026-10-01 19:51 UTCEPSS rescore
  15. 2026-10-01 15:33 UTCGHSA enrichment
  16. 2026-10-01 02:18 UTCEG score recompute
  17. 2026-10-01 02:18 UTCGHSA enrichment
  18. 2026-09-30 15:04 UTCEPSS rescore
  19. 2026-09-30 13:07 UTCGHSA enrichment
  20. 2026-09-29 23:55 UTCEG score recompute
  21. 2026-09-29 23:55 UTCGHSA enrichment
  22. 2026-09-29 09:56 UTCEG score recompute
  23. 2026-09-29 09:56 UTCGHSA enrichment
  24. 2026-09-28 20:45 UTCEG score recompute
  25. 2026-09-28 20:45 UTCGHSA enrichment
Show 22 more
  1. 2026-09-28 13:52 UTCEPSS rescore
  2. 2026-09-28 13:52 UTCEPSS rescore
  3. 2026-09-28 07:34 UTCGHSA enrichment
  4. 2026-09-27 18:23 UTCEG score recompute
  5. 2026-09-27 18:23 UTCGHSA enrichment
  6. 2026-09-27 13:49 UTCEPSS rescore
  7. 2026-09-27 05:12 UTCEG score recompute
  8. 2026-09-27 05:12 UTCGHSA enrichment
  9. 2026-09-26 15:59 UTCEPSS rescore
  10. 2026-09-26 15:57 UTCGHSA enrichment
  11. 2026-09-26 02:37 UTCEG score recompute
  12. 2026-09-26 02:37 UTCGHSA enrichment
  13. 2026-09-25 13:23 UTCEG score recompute
  14. 2026-09-25 13:23 UTCGHSA enrichment
  15. 2026-09-25 12:56 UTCEG score recompute
  16. 2026-09-25 12:56 UTCGHSA enrichment
  17. 2026-09-25 05:17 UTCEG score recompute▲ 7.80
  18. 2026-09-25 05:17 UTCGHSA enrichment
  19. 2026-09-25 05:16 UTCMITRE cvelistV5CVSS v3 → 7.8 · severity → HIGH
  20. 2026-09-24 17:33 UTCNVD update
  21. 2026-09-24 16:30 UTCEG score recompute
  22. 2026-09-24 16:26 UTCMITRE cvelistV5first tracked

Frequently asked(5)

What is CVE-2026-93798?
CVE-2026-93798 is a high vulnerability published on September 24, 2026. In the Linux kernel, the following vulnerability has been resolved: btrfs: fix reloc root cleanup in mergerelocroots() If the root we got has zero root refs in its root item, we are resetting the root's ->reloc_root without using barriers like we do everywhere else. Sashiko complained about this…
When was CVE-2026-93798 disclosed?
CVE-2026-93798 was first published on September 24, 2026, with the most recent update on October 3, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-93798 actively exploited?
CVE-2026-93798 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.1% probability of exploitation in the next 30 days (2nd percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-93798?
CVE-2026-93798 has a CVSS base score of 7.8 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-93798?
No fix for CVE-2026-93798 is confirmed yet. Until one is published, restrict network exposure of the affected system or apply the vendor's mitigation — for example, keep it off the internet or limit it to trusted networks — and watch the vendor's advisory for the fix. The vendor advisories EchelonGraph has for CVE-2026-93798 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

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