CVE-2026-64266

HIGHPre-NVD 7.87.8
EchelonGraph scoreMEDIUM confidence

“—” beside the score: it is equal to the CVSS score beside it.

Score 7.8 from GitHub Security Advisory (severity: HIGH) published 2026-07-25. A secondary CVSS source baseline 7.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: EPSS, GitHub Security Advisory, a secondary CVSS source
Trending — 4 sources updated this week
7.8EG
EchelonGraph verdictPlan a fixRemediate within your standard update timelines (the SSVC decision on this page).
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.2%CVSS: 7.8Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

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

fuse: re-lock request before returning from fuse_ref_folio()

fuse_ref_folio() unlocks the request but does not re-lock it before returning. fuse_chan_abort() can end the request and the async end callback (eg fuse_writepage_free()) can free the args while the subsequent copy chain logic after fuse_ref_folio() accesses them, leading to use-after-free issues.

Fix this by locking the request in fuse_ref_folio() before returning.

CVSS v3
7.8
EG Score
7.8HIGHmedium confidence
EG Risk
35
EG Risk 35/100

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 (value × EchelonGraph’s weight)
Severity78% × 45%
The EG Score, 7.8 of 10.
Exploitation0.2% × 40%
FIRST EPSS: the 30-day exploitation probability when EchelonGraph scored this CVE.
Automatability0% × 15%
CISA's BOD 26-04 default: no one has published Automatable for this CVE, and CISA treats it as “no” for a CVE not in KEV.
SSVC (CISA's decision table, applied by EchelonGraph): Track at low or medium mission impact; Track* at high (mission-essential systems).
Exploitation none (no CISA value, KEV listing or exploit code on record) · Automatable no (CISA's BOD 26-04 default) · Technical impact total (CISA's BOD 26-04 default). EchelonGraph holds no SSVC assessment of this CVE from CISA: none of these inputs is from Vulnrichment. EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE.
Action: A fix is available. Apply it within your standard update timelines.
EPSS PROB
0.2%
EPSS %ILE
5th
KEV
Not listed

SSVC (CISA's decision table, applied by EchelonGraph)Track at low or medium mission impact; Track* at high (mission-essential systems).

A fix is available. Apply it within your standard update timelines.

Exploitation none (no CISA value, KEV listing or exploit code on record) · Automatable no (CISA's BOD 26-04 default) · Technical impact total (CISA's BOD 26-04 default). EchelonGraph holds no SSVC assessment of this CVE from CISA: none of these inputs is from Vulnrichment. EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE. Mission impact is CISA's Mission & Well-being decision point, and only you can judge it. CISA's table makes it high when Mission Prevalence is Essential — the vulnerable component "directly provides capabilities that constitute at least one MEF for at least one entity" (MEF: mission essential function) — or when Public Well-Being Impact is Irreversible: "multiple fatalities are likely", the cyber-physical system "is likely lost or destroyed", "extreme or serious externalities" are imposed on other parties, or social systems such as elections or the financial grid "are destabilized and potentially collapse". CISA's decision table

BOD 26-04 (CISA's remediation timeline, Table 1)14 days if the affected system is publicly exposed; Fix on system upgrade if it is not.

In CISA KEV no (CISA's KEV catalog) · Automatable no (CISA's BOD 26-04 default) · Technical impact total (CISA's BOD 26-04 default). Where an input reads “CISA's BOD 26-04 default”, no one has published it for this CVE, and CISA's implementation guidance says: “If “Automatable” and “Technical Impact” information items about a CVE ID are not available and the CVE ID is not in the KEV Catalog, CISA will treat its values as “no” and “total,” respectively, until CISA or a third party provides metadata about the CVE ID. CISA will always provide the Vulnrichment data for a CVE ID listed in the KEV Catalog.” Whether your system is publicly exposed is yours to answer. BOD 26-04 binds US Federal Civilian Executive Branch agencies; for anyone else it is CISA's published timeline, a reference rather than an obligation. The directive · how EchelonGraph applies it

Published

July 25, 2026

Last Modified

August 17, 2026

Advisory Details (8)

Auto-updated Jul 27, 2026
Patch available.
Web page

fuse: re-lock request before returning from fuse_ref_folio() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/e6aa539720c3d8def69683ed0c07cf9faea4e8be
Web page

fuse: re-lock request before returning from fuse_ref_folio() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/be353caffa8640f5e25fb3714ce8b0cef5e410e5
Web page

fuse: re-lock request before returning from fuse_ref_folio() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/b5befa80fdbe287a98480effed9564712924add5
Web page

fuse: re-lock request before returning from fuse_ref_folio() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/65a1c2551f7e16085acbb54aedde1feaa559ba7a
Web page

fuse: re-lock request before returning from fuse_ref_folio() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/5630da218a45ba80f0aba0846cbe8aa655da122b
Web page

fuse: re-lock request before returning from fuse_ref_folio() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/1f9156714592356b4fda57beac7eab9c2a462dd3
Web page

fuse: re-lock request before returning from fuse_ref_folio() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/1ca605cfa59377f0143fb35b5b01360f37d1b7c4
Web page

fuse: re-lock request before returning from fuse_ref_folio() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/0e4a5a000123d81234e27a2f8187688cf608f755

Vendor Advisories for CVE-2026-64266(2)

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

Patch Availability(11)

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

(6 across 4 ecosystems)
Debian:11(2)
PackageVulnerable rangeFix by version rangeDependents
linux5.10.103-1 ... 5.10.92-2 (55 versions)
  • every version up to 5.10.262-1: fixed in 5.10.262-1
—
linux-6.16.1.106-3~deb11u1 ... 6.1.177-1~deb11u1 (22 versions)
  • every version up to 6.1.180-1~deb11u1: fixed in 6.1.180-1~deb11u1
—
Debian:12(2)
PackageVulnerable rangeFix by version rangeDependents
linux6.1.106-1 ... 6.1.99-1 (55 versions)
  • every version up to 6.1.180-1: fixed in 6.1.180-1
—
linux-6.12—
  • every version up to 6.12.100-1~deb12u1: fixed in 6.12.100-1~deb12u1
—
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
linux6.12.38-1 ... 6.12.95-1~bpo12+1 (30 versions)
  • every version up to 6.12.96-1: fixed in 6.12.96-1
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
linux6.12.100-1 ... 7.1~rc7-1~exp1 (159 versions)
  • every version up to 7.1.4-1: fixed in 7.1.4-1
—

Weakness Classification(1)

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

Additional Vendor Advisories

(11)

Data Freshness Timeline

(refreshed 13× in last 7d / 72× in last 30d)

Each row is a time one of our pipelines fetched, updated or re-scored this CVE. 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. An arrow marks a change the record states ("CVSS v3 → 9.1"); EPSS and GHSA rows show the values recorded at that time, not what changed (EPSS values are rounded; hover one for the exact figures). Most recent first.

Showing the most recent 100 of 312 refreshes on record for this CVE.

A repeat, a row identical to one the same pipeline wrote less than 10 seconds earlier, is not a separate refresh and is not counted. None are among the latest 100 rows. The 212 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-10-13 16:34 UTCEPSS rescoreEPSS 0.2% · 5th percentile
  2. 2026-10-13 11:43 UTCEG score recompute
  3. 2026-10-13 11:43 UTCVendor advisory
  4. 2026-10-13 11:43 UTCGHSA enrichmentGHSA-x828-8hm7-w4xw · GitHub severity HIGH · GitHub CVSS 7.8
  5. 2026-10-12 16:34 UTCEPSS rescoreEPSS 0.2% · 5th percentile
  6. 2026-10-12 15:48 UTCEG score recompute
  7. 2026-10-11 19:32 UTCEG score recompute
  8. 2026-10-11 16:48 UTCEG score recompute
  9. 2026-10-11 14:09 UTCEG score recompute
  10. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.2% · 5th percentile
  11. 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.2% · 5th percentile
  12. 2026-10-08 17:13 UTCEPSS rescoreEPSS 0.2% · 5th percentile
  13. 2026-10-07 23:48 UTCEPSS rescoreEPSS 0.2% · 5th percentile
  14. 2026-10-06 15:18 UTCEPSS rescoreEPSS 0.2% · 5th percentile
  15. 2026-10-05 17:43 UTCEPSS rescoreEPSS 0.2% · 5th percentile
  16. 2026-10-04 23:22 UTCEPSS rescoreEPSS 0.2% · 5th percentile
  17. 2026-10-04 07:40 UTCEG score recompute
  18. 2026-10-04 07:40 UTCVendor advisory
  19. 2026-10-04 07:40 UTCGHSA enrichmentGHSA-x828-8hm7-w4xw · GitHub severity HIGH · GitHub CVSS 7.8
  20. 2026-10-03 14:26 UTCEPSS rescoreEPSS 0.2% · 5th percentile
  21. 2026-10-02 19:41 UTCEG score recompute
  22. 2026-10-02 19:41 UTCVendor advisory
  23. 2026-10-02 19:40 UTCGHSA enrichmentGHSA-x828-8hm7-w4xw · GitHub severity HIGH · GitHub CVSS 7.8
  24. 2026-10-02 17:56 UTCEPSS rescoreEPSS 0.2% · 5th percentile
  25. 2026-10-01 19:50 UTCEPSS rescoreEPSS 0.2% · 5th percentile
Show 75 more
  1. 2026-10-01 15:47 UTCVendor advisory
  2. 2026-10-01 15:46 UTCGHSA enrichmentGHSA-x828-8hm7-w4xw · GitHub severity HIGH · GitHub CVSS 7.8
  3. 2026-10-01 04:30 UTCEG score recompute
  4. 2026-10-01 04:30 UTCVendor advisory
  5. 2026-10-01 04:29 UTCGHSA enrichmentGHSA-x828-8hm7-w4xw · GitHub severity HIGH · GitHub CVSS 7.8
  6. 2026-09-30 15:03 UTCEPSS rescoreEPSS 0.2% · 5th percentile
  7. 2026-09-28 13:51 UTCEPSS rescoreEPSS 0.2% · 4th percentile
  8. 2026-09-28 04:24 UTCEG score recompute
  9. 2026-09-28 04:24 UTCVendor advisory
  10. 2026-09-28 04:23 UTCGHSA enrichmentGHSA-x828-8hm7-w4xw · GitHub severity HIGH · GitHub CVSS 7.8
  11. 2026-09-26 15:59 UTCEPSS rescoreEPSS 0.2% · 4th percentile
  12. 2026-09-25 09:57 UTCEG score recompute
  13. 2026-09-25 09:57 UTCVendor advisory
  14. 2026-09-25 09:57 UTCGHSA enrichmentGHSA-x828-8hm7-w4xw · GitHub severity HIGH · GitHub CVSS 7.8
  15. 2026-09-24 09:43 UTCVendor advisory
  16. 2026-09-24 09:42 UTCGHSA enrichmentGHSA-x828-8hm7-w4xw · GitHub severity HIGH · GitHub CVSS 7.8
  17. 2026-09-23 22:14 UTCEG score recompute
  18. 2026-09-23 22:14 UTCVendor advisory
  19. 2026-09-23 22:14 UTCGHSA enrichmentGHSA-x828-8hm7-w4xw · GitHub severity HIGH · GitHub CVSS 7.8
  20. 2026-09-23 17:54 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  21. 2026-09-23 09:21 UTCVendor advisory
  22. 2026-09-23 09:21 UTCGHSA enrichmentGHSA-x828-8hm7-w4xw · GitHub severity HIGH · GitHub CVSS 7.8
  23. 2026-09-22 22:08 UTCEG score recompute
  24. 2026-09-22 22:08 UTCVendor advisory
  25. 2026-09-22 22:08 UTCGHSA enrichmentGHSA-x828-8hm7-w4xw · GitHub severity HIGH · GitHub CVSS 7.8
  26. 2026-09-20 20:16 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  27. 2026-09-20 01:37 UTCEG score recompute
  28. 2026-09-20 01:37 UTCVendor advisory
  29. 2026-09-20 01:37 UTCGHSA enrichmentGHSA-x828-8hm7-w4xw · GitHub severity HIGH · GitHub CVSS 7.8
  30. 2026-09-18 22:27 UTCEG score recompute
  31. 2026-09-18 22:27 UTCVendor advisory
  32. 2026-09-18 22:27 UTCGHSA enrichmentGHSA-x828-8hm7-w4xw · GitHub severity HIGH · GitHub CVSS 7.8
  33. 2026-09-18 19:28 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  34. 2026-09-18 02:55 UTCEG score recompute
  35. 2026-09-18 02:55 UTCVendor advisory
  36. 2026-09-18 02:55 UTCGHSA enrichmentGHSA-x828-8hm7-w4xw · GitHub severity HIGH · GitHub CVSS 7.8
  37. 2026-09-17 01:57 UTCEG score recompute
  38. 2026-09-17 01:57 UTCVendor advisory
  39. 2026-09-17 01:57 UTCGHSA enrichmentGHSA-x828-8hm7-w4xw · GitHub severity HIGH · GitHub CVSS 7.8
  40. 2026-09-16 14:08 UTCEPSS rescoreEPSS 0.2% · 5th percentile
  41. 2026-09-16 06:38 UTCEG score recompute
  42. 2026-09-16 06:38 UTCVendor advisory
  43. 2026-09-16 06:38 UTCGHSA enrichmentGHSA-x828-8hm7-w4xw · GitHub severity HIGH · GitHub CVSS 7.8
  44. 2026-09-16 05:15 UTCEPSS rescoreEPSS 0.2% · 5th percentile
  45. 2026-09-15 09:33 UTCEG score recompute
  46. 2026-09-15 09:33 UTCVendor advisory
  47. 2026-09-15 09:33 UTCGHSA enrichmentGHSA-x828-8hm7-w4xw · GitHub severity HIGH · GitHub CVSS 7.8
  48. 2026-09-14 11:54 UTCVendor advisory
  49. 2026-09-14 11:54 UTCGHSA enrichmentGHSA-x828-8hm7-w4xw · GitHub severity HIGH · GitHub CVSS 7.8
  50. 2026-09-14 00:41 UTCEG score recompute
  51. 2026-09-14 00:41 UTCVendor advisory
  52. 2026-09-14 00:41 UTCGHSA enrichmentGHSA-x828-8hm7-w4xw · GitHub severity HIGH · GitHub CVSS 7.8
  53. 2026-09-13 13:28 UTCVendor advisory
  54. 2026-09-13 13:28 UTCGHSA enrichmentGHSA-x828-8hm7-w4xw · GitHub severity HIGH · GitHub CVSS 7.8
  55. 2026-09-13 02:15 UTCEG score recompute
  56. 2026-09-13 02:15 UTCVendor advisory
  57. 2026-09-13 02:15 UTCGHSA enrichmentGHSA-x828-8hm7-w4xw · GitHub severity HIGH · GitHub CVSS 7.8
  58. 2026-09-12 15:00 UTCVendor advisory
  59. 2026-09-12 15:00 UTCGHSA enrichmentGHSA-x828-8hm7-w4xw · GitHub severity HIGH · GitHub CVSS 7.8
  60. 2026-09-12 03:47 UTCVendor advisory
  61. 2026-09-12 03:47 UTCGHSA enrichmentGHSA-x828-8hm7-w4xw · GitHub severity HIGH · GitHub CVSS 7.8
  62. 2026-09-11 16:34 UTCEG score recompute
  63. 2026-09-11 16:34 UTCVendor advisory
  64. 2026-09-11 16:33 UTCGHSA enrichmentGHSA-x828-8hm7-w4xw · GitHub severity HIGH · GitHub CVSS 7.8
  65. 2026-09-11 09:37 UTCEPSS rescoreEPSS 0.2% · 5th percentile
  66. 2026-09-11 02:26 UTCVendor advisory
  67. 2026-09-11 02:26 UTCGHSA enrichmentGHSA-x828-8hm7-w4xw · GitHub severity HIGH · GitHub CVSS 7.8
  68. 2026-09-10 13:32 UTCEG score recompute
  69. 2026-09-10 13:32 UTCVendor advisory
  70. 2026-09-10 13:32 UTCGHSA enrichmentGHSA-x828-8hm7-w4xw · GitHub severity HIGH · GitHub CVSS 7.8
  71. 2026-09-09 08:41 UTCEG score recompute
  72. 2026-09-09 08:41 UTCVendor advisory
  73. 2026-09-09 08:41 UTCGHSA enrichmentGHSA-x828-8hm7-w4xw · GitHub severity HIGH · GitHub CVSS 7.8
  74. 2026-09-08 22:01 UTCEPSS rescoreEPSS 0.2% · 5th percentile
  75. 2026-09-07 21:22 UTCEG score recompute

Frequently asked(5)

What is CVE-2026-64266?
CVE-2026-64266 is a high-severity vulnerability; its CVE record was published on July 25, 2026. In the Linux kernel, the following vulnerability has been resolved: fuse: re-lock request before returning from fusereffolio() fusereffolio() unlocks the request but does not re-lock it before returning. fusechanabort() can end the request and the async end callback (eg fusewritepagefree()) can…
When was the CVE record for CVE-2026-64266 published?
The CVE record for CVE-2026-64266 was published on July 25, 2026. That is the record's publication date; the vulnerability itself may have been made public earlier. EchelonGraph's copy of the record carries a last-modified date of August 17, 2026; the record at its source may have been updated since.
Is CVE-2026-64266 actively exploited?
CVE-2026-64266 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.2% probability of exploitation in the next 30 days (5th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-64266?
CVE-2026-64266 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-2026-64266?
A fix for CVE-2026-64266 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-64266 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

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