CVE-2026-68156

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Source
https://cve.org/CVERecord?id=CVE-2026-68156
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-68156.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-68156
Downstream
BELL (1)
DEBIAN (1)
MGASA (2)
OESA (2)
openSUSE (1)
RHSA (3)
RLSA (3)
SUSE (11)
UBUNTU (1)
Related
ALSA (3)
openSUSE (1)
SUSE (11)
Published
2026-08-10T11:59:22Z
Modified
2026-10-20T10:30:57Z
Severity
  • 9.8 (Critical) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H CVSS Calculator
Summary
libceph: refresh auth->authorizer_buf{,_len} after authorizer update
Details

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.

Database specific 
{
    "cna_assigner":  "Linux",
    "osv_generated_from":  "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/68xxx/CVE-2026-68156.json"
}
References

Affected packages

Git / git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git

Affected ranges

Type
GIT
Repo
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
Events
Introduced
0bed9b5c523d577378b6f83eab5835fe30c27208
Fixed
2334e9997308305ee4fd508fdfe6086c4150ed60
Fixed
79a273df64238a4ade8b709689a78589f755b8ef
Fixed
26f814187abceee90dbb29a02133adb4786fbb13
Fixed
9d37aec9ffe4e743dabc3f84502e9723e17a30d4
Fixed
75e82e8944ac1efe9fdb88bd2f14d9a031282bdf
Fixed
0060ec912292a550198d8d18ac95b433c92a7091
Fixed
5ecfcd5c05866f185357700b81b461dae4f5ebb2
Fixed
937d61f86d377a3aa578adae7a3dfcecdddf9d89
Type
GIT
Repo
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
Events
Introduced
3.4.50
Fixed
3.5
Type
GIT
Repo
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
Events
Introduced
3.9.7
Fixed
3.10
Type
GIT
Repo
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
Events
Introduced
29c65a277a64645af853e8c9a9b3dda0ddc421e0
Type
GIT
Repo
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
Events
Introduced
d2c7223497cf8228416c70e3f4238ddd6c5bdf3c

Affected versions

v3.*
v3.4.100
v3.4.101
v3.4.102
v3.4.103
v3.4.104
v3.4.105
v3.4.106
v3.4.107
v3.4.108
v3.4.109
v3.4.110
v3.4.111
v3.4.112
v3.4.113
v3.4.50
v3.4.51
v3.4.52
v3.4.53
v3.4.54
v3.4.55
v3.4.56
v3.4.57
v3.4.58
v3.4.59
v3.4.60
v3.4.61
v3.4.62
v3.4.63
v3.4.64
v3.4.65
v3.4.66
v3.4.67
v3.4.68
v3.4.69
v3.4.70
v3.4.71
v3.4.72
v3.4.73
v3.4.74
v3.4.75
v3.4.76
v3.4.77
v3.4.78
v3.4.79
v3.4.80
v3.4.81
v3.4.82
v3.4.83
v3.4.84
v3.4.85
v3.4.86
v3.4.87
v3.4.88
v3.4.89
v3.4.90
v3.4.91
v3.4.92
v3.4.93
v3.4.94
v3.4.95
v3.4.96
v3.4.97
v3.4.98
v3.4.99
v3.9.10
v3.9.11
v3.9.7
v3.9.8
v3.9.9

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-68156.json"

Linux / Kernel

Package

Name
Kernel

Affected ranges

Type
ECOSYSTEM
Events
Introduced
3.10.0
Fixed
5.10.265
Type
ECOSYSTEM
Events
Introduced
5.11.0
Fixed
5.15.216
Type
ECOSYSTEM
Events
Introduced
5.16.0
Fixed
6.1.183
Type
ECOSYSTEM
Events
Introduced
6.2.0
Fixed
6.6.148
Type
ECOSYSTEM
Events
Introduced
6.7.0
Fixed
6.12.101
Type
ECOSYSTEM
Events
Introduced
6.13.0
Fixed
6.18.42
Type
ECOSYSTEM
Events
Introduced
6.19.0
Fixed
7.1.6

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-68156.json"