CVE-2026-68156

CRITICALPre-NVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

Score 9.8 from GitHub Security Advisory (severity: CRITICAL) published 2026-08-10. A secondary CVSS source baseline 9.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 4 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: 0.7%CVSS: 9.8Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

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

libceph: refresh auth->authorizer_buf{,_len} after authorizer update

ceph_x_create_authorizer() caches au->buf->vec.iov_base and au->buf->vec.iov_len in struct ceph_auth_handshake. These cached values are then used by the messenger connect code when sending the authorizer.

ceph_x_update_authorizer() can rebuild the authorizer when a newer service ticket is available. If the rebuilt authorizer no longer fits in the existing buffer, ceph_x_build_authorizer() drops its reference to au->buf and allocates a new one. If this is the final reference, ceph_buffer_put() frees the old ceph_buffer and its vec.iov_base, but auth->authorizer_buf still points at that freed memory.

A subsequent msgr1 reconnect can therefore queue the stale pointer and trigger a KASAN slab-use-after-free in _copy_from_iter() while tcp_sendmsg() copies the authorizer.

Refresh auth->authorizer_buf and auth->authorizer_buf_len after a successful authorizer rebuild so the messenger sends the current buffer.

CVSS v3
9.8
EG Score
9.8CRITICALmedium 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: A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.
EPSS PROB
0.7%
EPSS %ILE
51st
KEV
Not listed

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

A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.

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

August 10, 2026

Last Modified

August 19, 2026

Advisory Details (8)

Auto-updated Sep 30, 2026
Patch available.
generic

libceph: refresh auth->authorizer_buf{,_len} after authorizer update - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/9d37aec9ffe4e743dabc3f84502e9723e17a30d4
generic

libceph: refresh auth->authorizer_buf{,_len} after authorizer update - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/937d61f86d377a3aa578adae7a3dfcecdddf9d89
generic

libceph: refresh auth->authorizer_buf{,_len} after authorizer update - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/79a273df64238a4ade8b709689a78589f755b8ef
generic

libceph: refresh auth->authorizer_buf{,_len} after authorizer update - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/75e82e8944ac1efe9fdb88bd2f14d9a031282bdf
generic

libceph: refresh auth->authorizer_buf{,_len} after authorizer update - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/5ecfcd5c05866f185357700b81b461dae4f5ebb2
generic

libceph: refresh auth->authorizer_buf{,_len} after authorizer update - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/26f814187abceee90dbb29a02133adb4786fbb13
generic

libceph: refresh auth->authorizer_buf{,_len} after authorizer update - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/2334e9997308305ee4fd508fdfe6086c4150ed60
generic

libceph: refresh auth->authorizer_buf{,_len} after authorizer update - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/0060ec912292a550198d8d18ac95b433c92a7091

Vendor Advisories for CVE-2026-68156(5)

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

Patch Availability(4)

Vendor / EcosystemFix (by version range) / PatchReleasedSource
ubuntulinux-tools-nvidia-tegra-rt-6.8 (6.8.0-1035.38) @ noble2026-10-05ubuntu
redhatkernel-rt-0:4.18.0-553.169.1.rt7.510.el8_102026-09-28redhat
redhatkernel-0:4.18.0-553.169.1.el8_102026-09-28redhat
redhatkernel-0:5.14.0-687.50.1.el9_82026-09-23redhat

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

(4 across 3 ecosystems)
Debian:12(2)
PackageVulnerable rangeFix by version rangeDependents
linux6.1.106-1 ... 6.1.99-1 (56 versions)
  • every version up to 6.1.187-1: fixed in 6.1.187-1
—
linux-6.126.12.100-1~deb12u1
  • every version up to 6.12.101-1~deb12u1: fixed in 6.12.101-1~deb12u1
—
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
linux6.12.100-1 ... 6.12.96-1 (32 versions)
  • every version up to 6.12.101-1: fixed in 6.12.101-1
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
linux6.12.100-1 ... 7.1~rc7-1~exp1 (161 versions)
  • every version up to 7.1.6-1: fixed in 7.1.6-1
—

Additional Vendor Advisories

(1)

Vendors that published advisories for this CVE beyond the curated set above. Broader coverage but minimal per-row detail — click through for the original advisory.

Data Freshness Timeline

(refreshed 40× in last 7d / 237× 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 462 total refreshes for this CVE.

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

Related CVEs(same vendor)

Frequently asked(5)

What is CVE-2026-68156?
CVE-2026-68156 is a critical vulnerability published on August 10, 2026. In the Linux kernel, the following vulnerability has been resolved: libceph: refresh auth->authorizerbuf{,len} after authorizer update cephxcreateauthorizer() caches au->buf->vec.iovbase and au->buf->vec.iovlen in struct cephauth_handshake. These cached values are then used by the messenger connect…
When was CVE-2026-68156 disclosed?
CVE-2026-68156 was first published on August 10, 2026, with the most recent update on August 19, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-68156 actively exploited?
CVE-2026-68156 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.7% probability of exploitation in the next 30 days (51st percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-68156?
CVE-2026-68156 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-2026-68156?
A fix for CVE-2026-68156 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-68156 are linked in the Vendor Advisories panel on this page.

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