CVE-2026-89990

CRITICALPre-NVD 9.89.8—
EchelonGraph scoreHIGH confidence

Score 9.8 from GitHub Security Advisory (severity: CRITICAL) published 2026-09-16. A secondary CVSS source baseline 9.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this week
9.8EG
EchelonGraph verdictPlan mitigationSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.7%CVSS: 9.8Exploit: 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:

ceph: lock mutex in ceph_mds_check_access()

MDS session OPEN handling replaces mdsc->s_cap_auths under mdsc->mutex, freeing the previous array and its strings.

ceph_mds_check_access() traverses this array without holding the mutex. A concurrent session reopen can therefore free the array while it is being inspected, resulting in a use-after-free like this:

Unable to handle kernel paging request at virtual address 003aaad64b2c8bb9 [...] Internal error: Oops: 0000000096000004 [#1] SMP Modules linked in: CPU: 56 UID: 2953037534 PID: 1253231 Comm: php-cgi8.4 Not tainted 6.18.45-i2-ampere #1146 NONE [..] pc : ceph_mds_check_access+0xd4/0x550 lr : ceph_mds_check_access+0xc8/0x550 [...] Call trace: ceph_mds_check_access+0xd4/0x550 (P) ceph_atomic_open+0x138/0xbe8 path_openat+0xa24/0xfa8 do_filp_open+0x94/0x158 do_sys_openat2+0x88/0xf8

CVSS v3
9.8
EG Score
9.8CRITICALhigh confidence
EG Risk
49
EG Risk 49/100CISA 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
Severity98% × 45%
Exploitation1% × 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
0.7%
EPSS %ILE
49th
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 total (CVSS ≥ 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 16, 2026

Last Modified

September 16, 2026

Advisory Details (4)

Auto-updated Sep 30, 2026
No patch confirmed yet.
generic

ceph: lock mutex in ceph_mds_check_access() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/df1a97d5313fccadb08390306d49b194fb027392
generic

ceph: lock mutex in ceph_mds_check_access() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/ca5bfea2045ef2eb3305cf2a9d8da549b76c37d3
generic

ceph: lock mutex in ceph_mds_check_access() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/a61c6ae1dae2611082b831b4aaa780878099c012
generic

ceph: lock mutex in ceph_mds_check_access() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/729c1ff670ece6f3d4b1738365a0b2f90d487523

Vendor Advisories for CVE-2026-89990(1)

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

Affected Packages

(3 across 3 ecosystems)
Debian:12(1)
PackageVulnerable rangeFix by version rangeDependents
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 52× in last 7d / 146× 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 146 total refreshes for this CVE.

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

Frequently asked(5)

What is CVE-2026-89990?
CVE-2026-89990 is a critical vulnerability published on September 16, 2026. In the Linux kernel, the following vulnerability has been resolved: ceph: lock mutex in cephmdscheck_access() MDS session OPEN handling replaces mdsc->scapauths under mdsc->mutex, freeing the previous array and its strings. cephmdscheck_access() traverses this array without holding the mutex. A…
When was CVE-2026-89990 disclosed?
CVE-2026-89990 was first published on September 16, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-89990 actively exploited?
CVE-2026-89990 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.7% probability of exploitation in the next 30 days (49th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-89990?
CVE-2026-89990 has a CVSS base score of 9.8 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-89990?
No fix for CVE-2026-89990 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-2026-89990 are linked in the Vendor Advisories panel on this page.

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