libceph: validate banner payload length
In the Linux kernel, the following vulnerability has been resolved: libceph: validate banner payload length When parsing the Ceph messenger v2 protocol banner, the `payload_len` field is decoded from the banner prefix. If a client sends a banner with a `payload_len` of 0, the kernel sets up a 0-length socket read. This violates an invariant in the state machine, triggering a warning in `populate_in_iter()`: ------------[ cut here ]------------ !iov_iter_count(&con->v2.in_iter) WARNING: net/ceph/messenger_v2.c:3129 at populate_in_iter net/ceph/messenger_v2.c:3129 [inline], CPU#1: kworker/1:3/5070 WARNING: net/ceph/messenger_v2.c:3129 at ceph_con_v2_try_read+0x6634/0x6810 net/ceph/messenger_v2.c:3159, CPU#1: kworker/1:3/5070 ... Call Trace: ceph_con_workfn+0x1f5/0x14a0 net/ceph/messenger.c:1575 process_one_work kernel/workqueue.c:3322 [inline] process_scheduled_works+0xa8e/0x14e0 kernel/workqueue.c:3405 worker_thread+0xa47/0xfb0 kernel/workqueue.c:3486 kthread+0x388/0x470 kernel/kthread.c:436 ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 According to the msgr2 protocol specification, the banner payload is expected to contain at least two 64-bit integers (`server_feat` and `server_req_feat`). Therefore, `payload_len` must be at least 16 bytes. Fix this by adding a check in `process_banner_prefix()` to reject a `payload_len` smaller than 16 bytes. This prevents the 0-length read and correctly aborts the connectio
CVE-2026-90067
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-2026-90067
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": "cd1a677cad994021b19665ed476aea63f5d54f31",
"lessThan": "279c0852999fd2384f4a88155091a99e81f96873",
"versionType": "git"
},
{
"status": "affected",
"version": "cd1a677cad994021b19665ed476aea63f5d54f31",
"lessThan": "6cf666e47f2b51d5a887ec8a3226cde951757d27",
"versionType": "git"
},
{
"status": "affected",
"version": "cd1a677cad994021b19665ed476aea63f5d54f31",
"lessThan": "3b2e62a7655d347a845a91155610ddae11daffc6",
"versionType": "git"
},
{
"status": "affected",
"version": "cd1a677cad994021b19665ed476aea63f5d54f31",
"lessThan": "c1b937ff24b19e69aa7fb1b0f46a74d4c9668692",
"versionType": "git"
},
{
"status": "affected",
"version": "cd1a677cad994021b19665ed476aea63f5d54f31",
"lessThan": "6d1c6f228854aa89844fd0152d7ed7ac72a55e89",
"versionType": "git"
},
{
"status": "affected",
"version": "cd1a677cad994021b19665ed476aea63f5d54f31",
"lessThan": "c77633a9595658210a6e216a071e5a396a0835a7",
"versionType": "git"
},
{
"status": "affected",
"version": "cd1a677cad994021b19665ed476aea63f5d54f31",
"lessThan": "f374967fcdf04001c9b66df1c19106fa83cd91f7",
"versionType": "git"
}
],
"programFiles": [
"net/ceph/messenger_v2.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "5.11"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "5.11",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "5.15.221",
"versionType": "semver",
"lessThanOrEqual": "5.15.*"
},
{
"status": "unaffected",
"version": "6.1.188",
"versionType": "semver",
"lessThanOrEqual": "6.1.*"
},
{
"status": "unaffected",
"version": "6.6.157",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.110",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.52",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.2.6",
"versionType": "semver",
"lessThanOrEqual": "7.2.*"
},
{
"status": "unaffected",
"version": "7.3",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"net/ceph/messenger_v2.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-90067
Source reference:
/cveMetadata/cveId
Publisher severity
high
Source reference: /containers/cna/metrics
- Event
- #36484 · Revision 1
- Added to Heist Feed
- Publisher date