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9.8
CRITICAL CVSS 3.1
CVE-2026-68156
libceph: refresh auth->authorizer_buf{,_len} after authorizer update
Overview
Description

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.

Details
INFO

Published Date :

Aug. 10, 2026, 1:20 p.m.

Last Modified :

Aug. 17, 2026, 5:18 a.m.

Remotely Exploit :

Yes !

Source :

416baaa9-dc9f-4396-8d5f-8c081fb06d67
Impact
Affected Products

The following products are affected by CVE-2026-68156 vulnerability. Even if cvefeed.io is aware of the exact versions of the products that are affected, the information is not represented in the table below.

ID Vendor Product Action
1 Linux linux_kernel
: Total Affected Vendor : 1 | Products : 1
Scoring
CVSS Scores
The Common Vulnerability Scoring System is a standardized framework for assessing the severity of vulnerabilities in software and systems. We collect and displays CVSS scores from various sources for each CVE.
Score Version Severity Vector Exploitability Score Impact Score Source
CVSS 3.1 CRITICAL 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Solution
Update authorizer buffer information after rebuilding to prevent memory corruption.
  • Refresh authorizer buffer and length after rebuild.
  • Ensure messenger uses current buffer for sending.
  • Apply Linux kernel updates.
References
References to Advisories, Solutions, and Tools

Here, you will find a curated list of external links that provide in-depth information, practical solutions, and valuable tools related to CVE-2026-68156.

URL Resource
https://git.kernel.org/stable/c/0060ec912292a550198d8d18ac95b433c92a7091
https://git.kernel.org/stable/c/5ecfcd5c05866f185357700b81b461dae4f5ebb2
https://git.kernel.org/stable/c/75e82e8944ac1efe9fdb88bd2f14d9a031282bdf
https://git.kernel.org/stable/c/937d61f86d377a3aa578adae7a3dfcecdddf9d89
https://git.kernel.org/stable/c/9d37aec9ffe4e743dabc3f84502e9723e17a30d4
CWE - Common Weakness Enumeration

While CVE identifies specific instances of vulnerabilities, CWE categorizes the common flaws or weaknesses that can lead to vulnerabilities. CVE-2026-68156 is associated with the following CWEs:

Common Attack Pattern Enumeration and Classification (CAPEC)

Common Attack Pattern Enumeration and Classification (CAPEC) stores attack patterns, which are descriptions of the common attributes and approaches employed by adversaries to exploit the CVE-2026-68156 weaknesses.

We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).

Results are limited to the first 15 repositories due to potential performance issues.

The following list is the news that have been mention CVE-2026-68156 vulnerability anywhere in the article.

Results are limited to the first 20 news articles due to potential performance issues.

The following table lists the changes that have been made to the CVE-2026-68156 vulnerability over time.

Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.

  • CVE Modified by 416baaa9-dc9f-4396-8d5f-8c081fb06d67

    Aug. 17, 2026

    Action Type Old Value New Value
    Changed Affected [{'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '0bed9b5c523d577378b6f83eab5835fe30c27208', 'lessThan': '9d37aec9ffe4e743dabc3f84502e9723e17a30d4', 'versionType': 'git'}, {'status': 'affected', 'version': '0bed9b5c523d577378b6f83eab5835fe30c27208', 'lessThan': '75e82e8944ac1efe9fdb88bd2f14d9a031282bdf', 'versionType': 'git'}, {'status': 'affected', 'version': '0bed9b5c523d577378b6f83eab5835fe30c27208', 'lessThan': '0060ec912292a550198d8d18ac95b433c92a7091', 'versionType': 'git'}, {'status': 'affected', 'version': '0bed9b5c523d577378b6f83eab5835fe30c27208', 'lessThan': '5ecfcd5c05866f185357700b81b461dae4f5ebb2', 'versionType': 'git'}, {'status': 'affected', 'version': '0bed9b5c523d577378b6f83eab5835fe30c27208', 'lessThan': '937d61f86d377a3aa578adae7a3dfcecdddf9d89', 'versionType': 'git'}, {'status': 'affected', 'version': '29c65a277a64645af853e8c9a9b3dda0ddc421e0', 'versionType': 'git'}, {'status': 'affected', 'version': 'd2c7223497cf8228416c70e3f4238ddd6c5bdf3c', 'versionType': 'git'}, {'status': 'affected', 'version': '3.4.50', 'lessThan': '3.5', 'versionType': 'semver'}, {'status': 'affected', 'version': '3.9.7', 'lessThan': '3.10', 'versionType': 'semver'}], 'programFiles': ['net/ceph/auth_x.c'], 'defaultStatus': 'unaffected'}, {'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '3.10'}, {'status': 'unaffected', 'version': '0', 'lessThan': '3.10', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '6.6.148', 'versionType': 'semver', 'lessThanOrEqual': '6.6.*'}, {'status': 'unaffected', 'version': '6.12.101', 'versionType': 'semver', 'lessThanOrEqual': '6.12.*'}, {'status': 'unaffected', 'version': '6.18.42', 'versionType': 'semver', 'lessThanOrEqual': '6.18.*'}, {'status': 'unaffected', 'version': '7.1.6', 'versionType': 'semver', 'lessThanOrEqual': '7.1.*'}, {'status': 'unaffected', 'version': '7.2-rc5', 'versionType': 'original_commit_for_fix', 'lessThanOrEqual': '*'}], 'programFiles': ['net/ceph/auth_x.c'], 'defaultStatus': 'affected'}] [{'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '0bed9b5c523d577378b6f83eab5835fe30c27208', 'lessThan': '9d37aec9ffe4e743dabc3f84502e9723e17a30d4', 'versionType': 'git'}, {'status': 'affected', 'version': '0bed9b5c523d577378b6f83eab5835fe30c27208', 'lessThan': '75e82e8944ac1efe9fdb88bd2f14d9a031282bdf', 'versionType': 'git'}, {'status': 'affected', 'version': '0bed9b5c523d577378b6f83eab5835fe30c27208', 'lessThan': '0060ec912292a550198d8d18ac95b433c92a7091', 'versionType': 'git'}, {'status': 'affected', 'version': '0bed9b5c523d577378b6f83eab5835fe30c27208', 'lessThan': '5ecfcd5c05866f185357700b81b461dae4f5ebb2', 'versionType': 'git'}, {'status': 'affected', 'version': '0bed9b5c523d577378b6f83eab5835fe30c27208', 'lessThan': '937d61f86d377a3aa578adae7a3dfcecdddf9d89', 'versionType': 'git'}, {'status': 'affected', 'version': '29c65a277a64645af853e8c9a9b3dda0ddc421e0', 'versionType': 'git'}, {'status': 'affected', 'version': 'd2c7223497cf8228416c70e3f4238ddd6c5bdf3c', 'versionType': 'git'}, {'status': 'affected', 'version': '3.4.50', 'lessThan': '3.5', 'versionType': 'semver'}, {'status': 'affected', 'version': '3.9.7', 'lessThan': '3.10', 'versionType': 'semver'}], 'programFiles': ['net/ceph/auth_x.c'], 'defaultStatus': 'unaffected'}, {'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '3.10'}, {'status': 'unaffected', 'version': '0', 'lessThan': '3.10', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '6.6.148', 'versionType': 'semver', 'lessThanOrEqual': '6.6.*'}, {'status': 'unaffected', 'version': '6.12.101', 'versionType': 'semver', 'lessThanOrEqual': '6.12.*'}, {'status': 'unaffected', 'version': '6.18.42', 'versionType': 'semver', 'lessThanOrEqual': '6.18.*'}, {'status': 'unaffected', 'version': '7.1.6', 'versionType': 'semver', 'lessThanOrEqual': '7.1.*'}, {'status': 'unaffected', 'version': '7.2', 'versionType': 'original_commit_for_fix', 'lessThanOrEqual': '*'}], 'programFiles': ['net/ceph/auth_x.c'], 'defaultStatus': 'affected'}]
  • CVE Modified by 416baaa9-dc9f-4396-8d5f-8c081fb06d67

    Aug. 13, 2026

    Action Type Old Value New Value
    Added CVSS V3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
  • New CVE Received by 416baaa9-dc9f-4396-8d5f-8c081fb06d67

    Aug. 10, 2026

    Action Type Old Value New Value
    Added Affected [{'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '0bed9b5c523d577378b6f83eab5835fe30c27208', 'lessThan': '9d37aec9ffe4e743dabc3f84502e9723e17a30d4', 'versionType': 'git'}, {'status': 'affected', 'version': '0bed9b5c523d577378b6f83eab5835fe30c27208', 'lessThan': '75e82e8944ac1efe9fdb88bd2f14d9a031282bdf', 'versionType': 'git'}, {'status': 'affected', 'version': '0bed9b5c523d577378b6f83eab5835fe30c27208', 'lessThan': '0060ec912292a550198d8d18ac95b433c92a7091', 'versionType': 'git'}, {'status': 'affected', 'version': '0bed9b5c523d577378b6f83eab5835fe30c27208', 'lessThan': '5ecfcd5c05866f185357700b81b461dae4f5ebb2', 'versionType': 'git'}, {'status': 'affected', 'version': '0bed9b5c523d577378b6f83eab5835fe30c27208', 'lessThan': '937d61f86d377a3aa578adae7a3dfcecdddf9d89', 'versionType': 'git'}, {'status': 'affected', 'version': '29c65a277a64645af853e8c9a9b3dda0ddc421e0', 'versionType': 'git'}, {'status': 'affected', 'version': 'd2c7223497cf8228416c70e3f4238ddd6c5bdf3c', 'versionType': 'git'}, {'status': 'affected', 'version': '3.4.50', 'lessThan': '3.5', 'versionType': 'semver'}, {'status': 'affected', 'version': '3.9.7', 'lessThan': '3.10', 'versionType': 'semver'}], 'programFiles': ['net/ceph/auth_x.c'], 'defaultStatus': 'unaffected'}, {'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '3.10'}, {'status': 'unaffected', 'version': '0', 'lessThan': '3.10', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '6.6.148', 'versionType': 'semver', 'lessThanOrEqual': '6.6.*'}, {'status': 'unaffected', 'version': '6.12.101', 'versionType': 'semver', 'lessThanOrEqual': '6.12.*'}, {'status': 'unaffected', 'version': '6.18.42', 'versionType': 'semver', 'lessThanOrEqual': '6.18.*'}, {'status': 'unaffected', 'version': '7.1.6', 'versionType': 'semver', 'lessThanOrEqual': '7.1.*'}, {'status': 'unaffected', 'version': '7.2-rc5', 'versionType': 'original_commit_for_fix', 'lessThanOrEqual': '*'}], 'programFiles': ['net/ceph/auth_x.c'], 'defaultStatus': 'affected'}]
    Added Description 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.
    Added Reference https://git.kernel.org/stable/c/0060ec912292a550198d8d18ac95b433c92a7091
    Added Reference https://git.kernel.org/stable/c/5ecfcd5c05866f185357700b81b461dae4f5ebb2
    Added Reference https://git.kernel.org/stable/c/75e82e8944ac1efe9fdb88bd2f14d9a031282bdf
    Added Reference https://git.kernel.org/stable/c/937d61f86d377a3aa578adae7a3dfcecdddf9d89
    Added Reference https://git.kernel.org/stable/c/9d37aec9ffe4e743dabc3f84502e9723e17a30d4
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days. Following chart shows the EPSS score history of the vulnerability.
CVSS
Vulnerability Scoring Details
Base CVSS Score: 9.8
Attack Vector
Attack Complexity
Privileges Required
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Scope
Confidentiality Impact
Integrity Impact
Availability Impact