CVE-2026-68156Network attack vector

Ceph client crash via stale authorizer pointer

Published Aug 10, 2026 · Updated Aug 10, 2026

Use-after-free in Linux kernel libceph allows remote attackers to crash Ceph clients during authenticated msgr1 reconnects. ceph_x_update_authorizer() can replace an undersized authorizer buffer without refreshing the cached auth->authorizer_buf pointer, so tcp_sendmsg() later copies from freed memory. Reachability requires the kernel Ceph client, a larger authorizer rebuilt from a newer service ticket, and a later msgr1 reconnect; the demonstrated consequence is a kernel memory fault and service interruption.

CVSS severity9.8
Critical
EPSS probability0.68%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Use-after-free in Linux kernel libceph allows remote attackers to crash Ceph clients during authenticated msgr1 reconnects. ceph_x_update_authorizer() can replace an undersized authorizer buffer without refreshing the cached auth->authorizer_buf pointer, so tcp_sendmsg() later copies from freed memory. Reachability requires the kernel Ceph client, a larger authorizer rebuilt from a newer service ticket, and a later msgr1 reconnect; the demonstrated consequence is a kernel memory fault and service interruption.

The record

CVE
CVE-2026-68156
Published
Aug 10, 2026
Updated
Aug 10, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-825, T1499
Attack vector
network
Privileges
Unavailable

Timeline

How it unfolded

  1. Aug 10, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 10, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0bed9b5c523d577378b6f83eab5835fe30c27208 <0060ec912292a550198d8d18ac95b433c92a7091
  2. Affected versionversion=0bed9b5c523d577378b6f83eab5835fe30c27208 <5ecfcd5c05866f185357700b81b461dae4f5ebb2
  3. Affected versionversion=0bed9b5c523d577378b6f83eab5835fe30c27208 <75e82e8944ac1efe9fdb88bd2f14d9a031282bdf
  4. Affected versionversion=0bed9b5c523d577378b6f83eab5835fe30c27208 <937d61f86d377a3aa578adae7a3dfcecdddf9d89
  5. Affected versionversion=0bed9b5c523d577378b6f83eab5835fe30c27208 <9d37aec9ffe4e743dabc3f84502e9723e17a30d4
  6. Affected versionversion=29c65a277a64645af853e8c9a9b3dda0ddc421e0
  7. Affected versionversion=3.10
  8. Affected versionversion=3.4.50 <3.5
  9. Affected versionversion=3.9.7 <3.10
  10. Affected versionversion=d2c7223497cf8228416c70e3f4238ddd6c5bdf3c

What conditions does exploitation require?

Attack vectornetwork
Required privilegesUnavailable in this record.

What is affected?

The Linux Kernel Organization · Linuxversion=0bed9b5c523d577378b6f83eab5835fe30c27208 <0060ec912292a550198d8d18ac95b433c92a7091; version=0bed9b5c523d577378b6f83eab5835fe30c27208 <5ecfcd5c05866f185357700b81b461dae4f5ebb2; version=0bed9b5c523d577378b6f83eab5835fe30c27208 <75e82e8944ac1efe9fdb88bd2f14d9a031282bdf; version=0bed9b5c523d577378b6f83eab5835fe30c27208 <937d61f86d377a3aa578adae7a3dfcecdddf9d89; version=0bed9b5c523d577378b6f83eab5835fe30c27208 <9d37aec9ffe4e743dabc3f84502e9723e17a30d4; version=29c65a277a64645af853e8c9a9b3dda0ddc421e0; version=3.10; version=3.4.50 <3.5; version=3.9.7 <3.10; version=d2c7223497cf8228416c70e3f4238ddd6c5bdf3c

Published CVSS scores

9.8Linux CNACVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
7.0Red HatCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-825Expired Pointer Dereference
T1499Endpoint Denial of Service

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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