CVE-2026-80959

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 2026-09-11. 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 — 3 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:

dm-pcache: bound the persisted tail-position offset

cache_pos_decode() takes the persisted key_tail and dirty_tail seg_off from the cache device and addresses within the segment with it. A seg_off at or past the segment data_size, controllable by whoever supplies the device (CAP_SYS_ADMIN), reads past the segment data.

Reject a decoded seg_off that is not below the segment data_size.

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
6th
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

September 11, 2026

Last Modified

September 13, 2026

Advisory Details (3)

Auto-updated Sep 13, 2026
Patch available.
Web page

dm-pcache: bound the persisted tail-position offset - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/ffd9a214a94f9928e54856f42b1cc3e33fb10e36
Web page

dm-pcache: bound the persisted tail-position offset - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/d1898576090a10d2ac2715218a652e78fb65a6b0
Web page

dm-pcache: bound the persisted tail-position offset - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/8bf7a06ca3c1611809725f58cfd573f2ffbda75f

Vendor Advisories for CVE-2026-80959(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 rangeFix by version rangeDependents
linux6.12.100-1 ... 7.2~rc7-1~exp1 (178 versions)
  • every version up to 7.2.6-1: fixed in 7.2.6-1
—

Data Freshness Timeline

(refreshed 26× in last 7d / 115× 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 126 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 26 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-10-13 16:35 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  2. 2026-10-13 06:23 UTCEG score recompute
  3. 2026-10-13 06:23 UTCGHSA enrichmentGHSA-9gr7-7h3r-cj7p · GitHub severity HIGH · GitHub CVSS 7.8
  4. 2026-10-12 16:35 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  5. 2026-10-12 14:57 UTCEG score recompute
  6. 2026-10-11 22:23 UTCEG score recompute
  7. 2026-10-11 22:23 UTCGHSA enrichmentGHSA-9gr7-7h3r-cj7p · GitHub severity HIGH · GitHub CVSS 7.8
  8. 2026-10-11 19:21 UTCEG score recompute
  9. 2026-10-11 16:37 UTCEG score recompute
  10. 2026-10-11 13:55 UTCEG score recompute
  11. 2026-10-11 13:49 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  12. 2026-10-11 10:02 UTCGHSA enrichmentGHSA-9gr7-7h3r-cj7p · GitHub severity HIGH · GitHub CVSS 7.8
  13. 2026-10-10 20:30 UTCEG score recompute
  14. 2026-10-10 20:30 UTCGHSA enrichmentGHSA-9gr7-7h3r-cj7p · GitHub severity HIGH · GitHub CVSS 7.8
  15. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  16. 2026-10-10 08:00 UTCEG score recompute
  17. 2026-10-10 08:00 UTCGHSA enrichmentGHSA-9gr7-7h3r-cj7p · GitHub severity HIGH · GitHub CVSS 7.8
  18. 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  19. 2026-10-09 19:27 UTCGHSA enrichmentGHSA-9gr7-7h3r-cj7p · GitHub severity HIGH · GitHub CVSS 7.8
  20. 2026-10-08 23:29 UTCEG score recompute
  21. 2026-10-08 23:29 UTCGHSA enrichmentGHSA-9gr7-7h3r-cj7p · GitHub severity HIGH · GitHub CVSS 7.8
  22. 2026-10-08 17:13 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  23. 2026-10-08 08:32 UTCEG score recompute
  24. 2026-10-08 08:32 UTCGHSA enrichmentGHSA-9gr7-7h3r-cj7p · GitHub severity HIGH · GitHub CVSS 7.8
  25. 2026-10-07 23:48 UTCEPSS rescoreEPSS 0.2% · 6th percentile
Show 75 more
  1. 2026-10-07 20:12 UTCGHSA enrichmentGHSA-9gr7-7h3r-cj7p · GitHub severity HIGH · GitHub CVSS 7.8
  2. 2026-10-07 07:51 UTCGHSA enrichmentGHSA-9gr7-7h3r-cj7p · GitHub severity HIGH · GitHub CVSS 7.8
  3. 2026-10-06 19:30 UTCEG score recompute
  4. 2026-10-06 19:30 UTCGHSA enrichmentGHSA-9gr7-7h3r-cj7p · GitHub severity HIGH · GitHub CVSS 7.8
  5. 2026-10-06 15:18 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  6. 2026-10-06 07:10 UTCGHSA enrichmentGHSA-9gr7-7h3r-cj7p · GitHub severity HIGH · GitHub CVSS 7.8
  7. 2026-10-05 18:10 UTCEG score recompute
  8. 2026-10-05 18:09 UTCGHSA enrichmentGHSA-9gr7-7h3r-cj7p · GitHub severity HIGH · GitHub CVSS 7.8
  9. 2026-10-05 17:43 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  10. 2026-10-05 05:48 UTCEG score recompute
  11. 2026-10-05 05:48 UTCGHSA enrichmentGHSA-9gr7-7h3r-cj7p · GitHub severity HIGH · GitHub CVSS 7.8
  12. 2026-10-04 23:22 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  13. 2026-10-04 17:27 UTCGHSA enrichmentGHSA-9gr7-7h3r-cj7p · GitHub severity HIGH · GitHub CVSS 7.8
  14. 2026-10-04 04:47 UTCGHSA enrichmentGHSA-9gr7-7h3r-cj7p · GitHub severity HIGH · GitHub CVSS 7.8
  15. 2026-10-03 16:26 UTCEG score recompute
  16. 2026-10-03 16:26 UTCGHSA enrichmentGHSA-9gr7-7h3r-cj7p · GitHub severity HIGH · GitHub CVSS 7.8
  17. 2026-10-03 14:26 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  18. 2026-10-03 04:06 UTCEG score recompute
  19. 2026-10-03 04:06 UTCGHSA enrichmentGHSA-9gr7-7h3r-cj7p · GitHub severity HIGH · GitHub CVSS 7.8
  20. 2026-10-02 17:57 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  21. 2026-10-02 15:45 UTCGHSA enrichmentGHSA-9gr7-7h3r-cj7p · GitHub severity HIGH · GitHub CVSS 7.8
  22. 2026-10-02 03:25 UTCEG score recompute
  23. 2026-10-02 03:25 UTCGHSA enrichmentGHSA-9gr7-7h3r-cj7p · GitHub severity HIGH · GitHub CVSS 7.8
  24. 2026-10-01 19:50 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  25. 2026-10-01 14:48 UTCGHSA enrichmentGHSA-9gr7-7h3r-cj7p · GitHub severity HIGH · GitHub CVSS 7.8
  26. 2026-10-01 02:28 UTCEG score recompute
  27. 2026-10-01 02:28 UTCGHSA enrichmentGHSA-9gr7-7h3r-cj7p · GitHub severity HIGH · GitHub CVSS 7.8
  28. 2026-09-30 15:04 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  29. 2026-09-30 14:07 UTCGHSA enrichmentGHSA-9gr7-7h3r-cj7p · GitHub severity HIGH · GitHub CVSS 7.8
  30. 2026-09-30 01:47 UTCEG score recompute
  31. 2026-09-30 01:47 UTCGHSA enrichmentGHSA-9gr7-7h3r-cj7p · GitHub severity HIGH · GitHub CVSS 7.8
  32. 2026-09-29 07:01 UTCEG score recompute
  33. 2026-09-29 07:01 UTCGHSA enrichmentGHSA-9gr7-7h3r-cj7p · GitHub severity HIGH · GitHub CVSS 7.8
  34. 2026-09-28 18:40 UTCEG score recompute
  35. 2026-09-28 18:40 UTCGHSA enrichmentGHSA-9gr7-7h3r-cj7p · GitHub severity HIGH · GitHub CVSS 7.8
  36. 2026-09-28 13:52 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  37. 2026-09-28 05:54 UTCGHSA enrichmentGHSA-9gr7-7h3r-cj7p · GitHub severity HIGH · GitHub CVSS 7.8
  38. 2026-09-27 17:34 UTCEG score recompute
  39. 2026-09-27 17:33 UTCGHSA enrichmentGHSA-9gr7-7h3r-cj7p · GitHub severity HIGH · GitHub CVSS 7.8
  40. 2026-09-27 13:48 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  41. 2026-09-27 05:13 UTCGHSA enrichmentGHSA-9gr7-7h3r-cj7p · GitHub severity HIGH · GitHub CVSS 7.8
  42. 2026-09-26 16:49 UTCEG score recompute
  43. 2026-09-26 16:49 UTCGHSA enrichmentGHSA-9gr7-7h3r-cj7p · GitHub severity HIGH · GitHub CVSS 7.8
  44. 2026-09-26 15:59 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  45. 2026-09-26 04:18 UTCEG score recompute
  46. 2026-09-26 04:17 UTCGHSA enrichmentGHSA-9gr7-7h3r-cj7p · GitHub severity HIGH · GitHub CVSS 7.8
  47. 2026-09-26 00:28 UTCEPSS rescoreEPSS 0.2% · 5th percentile
  48. 2026-09-25 15:55 UTCGHSA enrichmentGHSA-9gr7-7h3r-cj7p · GitHub severity HIGH · GitHub CVSS 7.8
  49. 2026-09-25 03:34 UTCGHSA enrichmentGHSA-9gr7-7h3r-cj7p · GitHub severity HIGH · GitHub CVSS 7.8
  50. 2026-09-24 15:14 UTCEG score recompute
  51. 2026-09-24 15:14 UTCGHSA enrichmentGHSA-9gr7-7h3r-cj7p · GitHub severity HIGH · GitHub CVSS 7.8
  52. 2026-09-24 14:04 UTCEPSS rescoreEPSS 0.2% · 5th percentile
  53. 2026-09-24 02:53 UTCEG score recompute
  54. 2026-09-24 02:53 UTCGHSA enrichmentGHSA-9gr7-7h3r-cj7p · GitHub severity HIGH · GitHub CVSS 7.8
  55. 2026-09-23 17:54 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  56. 2026-09-23 14:32 UTCGHSA enrichmentGHSA-9gr7-7h3r-cj7p · GitHub severity HIGH · GitHub CVSS 7.8
  57. 2026-09-23 02:12 UTCEG score recompute
  58. 2026-09-23 02:12 UTCGHSA enrichmentGHSA-9gr7-7h3r-cj7p · GitHub severity HIGH · GitHub CVSS 7.8
  59. 2026-09-22 16:01 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  60. 2026-09-22 13:51 UTCGHSA enrichmentGHSA-9gr7-7h3r-cj7p · GitHub severity HIGH · GitHub CVSS 7.8
  61. 2026-09-22 01:30 UTCEG score recompute
  62. 2026-09-22 01:30 UTCGHSA enrichmentGHSA-9gr7-7h3r-cj7p · GitHub severity HIGH · GitHub CVSS 7.8
  63. 2026-09-21 21:09 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  64. 2026-09-21 13:10 UTCGHSA enrichmentGHSA-9gr7-7h3r-cj7p · GitHub severity HIGH · GitHub CVSS 7.8
  65. 2026-09-21 00:50 UTCEG score recompute
  66. 2026-09-21 00:50 UTCGHSA enrichmentGHSA-9gr7-7h3r-cj7p · GitHub severity HIGH · GitHub CVSS 7.8
  67. 2026-09-20 20:16 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  68. 2026-09-20 12:29 UTCGHSA enrichmentGHSA-9gr7-7h3r-cj7p · GitHub severity HIGH · GitHub CVSS 7.8
  69. 2026-09-19 23:59 UTCEG score recompute
  70. 2026-09-19 23:59 UTCGHSA enrichmentGHSA-9gr7-7h3r-cj7p · GitHub severity HIGH · GitHub CVSS 7.8
  71. 2026-09-19 11:39 UTCGHSA enrichmentGHSA-9gr7-7h3r-cj7p · GitHub severity HIGH · GitHub CVSS 7.8
  72. 2026-09-18 23:16 UTCEG score recompute
  73. 2026-09-18 23:16 UTCGHSA enrichmentGHSA-9gr7-7h3r-cj7p · GitHub severity HIGH · GitHub CVSS 7.8
  74. 2026-09-18 19:28 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  75. 2026-09-18 10:56 UTCGHSA enrichmentGHSA-9gr7-7h3r-cj7p · GitHub severity HIGH · GitHub CVSS 7.8

Frequently asked(5)

What is CVE-2026-80959?
CVE-2026-80959 is a high-severity vulnerability; its CVE record was published on September 11, 2026. In the Linux kernel, the following vulnerability has been resolved: dm-pcache: bound the persisted tail-position offset cacheposdecode() takes the persisted keytail and dirtytail seg_off from the cache device and addresses within the segment with it. A seg_off at or past the segment data_size,…
When was the CVE record for CVE-2026-80959 published?
The CVE record for CVE-2026-80959 was published on September 11, 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 September 13, 2026; the record at its source may have been updated since.
Is CVE-2026-80959 actively exploited?
CVE-2026-80959 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.2% probability of exploitation in the next 30 days (6th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-80959?
CVE-2026-80959 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-2026-80959?
A fix for CVE-2026-80959 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-80959 are linked in the Vendor Advisories panel on this page.

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