Answer in brief
CVE-2026-90067 records a High severity (CVSS 7.5) vulnerability in libceph: validate banner payload length. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 7.5. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=cd1a677cad994021b19665ed476aea63f5d54f31 <279c0852999fd2384f4a88155091a99e81f96873 || >=cd1a677cad994021b19665ed476aea63f5d54f31 <6cf666e47f2b51d5a887ec8a3226cde951757d27 || >=cd1a677cad994021b19665ed476aea63f5d54f31 <3b2e62a7655d347a845a91155610ddae11daffc6 || >=cd1a677cad994021b19665ed476aea63f5d54f31 <c1b937ff24b19e69aa7fb1b0f46a74d4c9668692 || >=cd1a677cad994021b19665ed476aea63f5d54f31 <6d1c6f228854aa89844fd0152d7ed7ac72a55e89 || >=cd1a677cad994021b19665ed476aea63f5d54f31 <c77633a9595658210a6e216a071e5a396a0835a7 || >=cd1a677cad994021b19665ed476aea63f5d54f31 <f374967fcdf04001c9b66df1c19106fa83cd91f7 | 279c0852999fd2384f4a88155091a99e81f96873, 6cf666e47f2b51d5a887ec8a3226cde951757d27, 3b2e62a7655d347a845a91155610ddae11daffc6, c1b937ff24b19e69aa7fb1b0f46a74d4c9668692, 6d1c6f228854aa89844fd0152d7ed7ac72a55e89, c77633a9595658210a6e216a071e5a396a0835a7, f374967fcdf04001c9b66df1c19106fa83cd91f7 |
| Linux/Linuxgeneric | 5.11 | Not reported |
Published upstream
Sep 17, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Oct 19, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Sep 17, 2026
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: <TASK> 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 </TASK> 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 connection with a protocol error.
Quoted source text, attributed separately from HOL analysis.