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CVE PROGRAM SOURCE RECORD7.5 High

CVE-2026-90067

libceph: validate banner payload length

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Status
Published
Published
Updated
Assigning organization
Linux

Description

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.

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

Linux Linux

Default version status: unaffected

  • cd1a677cad994021b19665ed476aea63f5d54f31 to < 279c0852999fd2384f4a88155091a99e81f96873affected
  • cd1a677cad994021b19665ed476aea63f5d54f31 to < 6cf666e47f2b51d5a887ec8a3226cde951757d27affected
  • cd1a677cad994021b19665ed476aea63f5d54f31 to < 3b2e62a7655d347a845a91155610ddae11daffc6affected
  • cd1a677cad994021b19665ed476aea63f5d54f31 to < c1b937ff24b19e69aa7fb1b0f46a74d4c9668692affected
  • cd1a677cad994021b19665ed476aea63f5d54f31 to < 6d1c6f228854aa89844fd0152d7ed7ac72a55e89affected
  • cd1a677cad994021b19665ed476aea63f5d54f31 to < c77633a9595658210a6e216a071e5a396a0835a7affected
  • cd1a677cad994021b19665ed476aea63f5d54f31 to < f374967fcdf04001c9b66df1c19106fa83cd91f7affected

Linux Linux

Default version status: affected

  • 5.11affected
  • 0 to < 5.11unaffected
  • 5.15.221 to ≤ 5.15.*unaffected
  • 6.1.188 to ≤ 6.1.*unaffected
  • 6.6.157 to ≤ 6.6.*unaffected
  • 6.12.110 to ≤ 6.12.*unaffected
  • 6.18.52 to ≤ 6.18.*unaffected
  • 7.2.6 to ≤ 7.2.*unaffected
  • 7.3 to ≤ *unaffected

References