libceph: refresh auth->authorizer_buf{,_len} after authorizer update
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.
CVE-2026-68156
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2026-68156
Linux
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Linux
Source reference: /containers/cna/affected/1/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "0bed9b5c523d577378b6f83eab5835fe30c27208",
"lessThan": "2334e9997308305ee4fd508fdfe6086c4150ed60",
"versionType": "git"
},
{
"status": "affected",
"version": "0bed9b5c523d577378b6f83eab5835fe30c27208",
"lessThan": "79a273df64238a4ade8b709689a78589f755b8ef",
"versionType": "git"
},
{
"status": "affected",
"version": "0bed9b5c523d577378b6f83eab5835fe30c27208",
"lessThan": "26f814187abceee90dbb29a02133adb4786fbb13",
"versionType": "git"
},
{
"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": "5.10.265",
"versionType": "semver",
"lessThanOrEqual": "5.10.*"
},
{
"status": "unaffected",
"version": "5.15.216",
"versionType": "semver",
"lessThanOrEqual": "5.15.*"
},
{
"status": "unaffected",
"version": "6.1.183",
"versionType": "semver",
"lessThanOrEqual": "6.1.*"
},
{
"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"
}
]- Related CVEs
- CVE-2026-68156
Source reference:
/cveMetadata/cveId
Publisher severity
critical
Source reference: /containers/cna/metrics
- Event
- #41142 · Revision 1
- Added to Heist Feed
- Publisher date