CVE-2026-31536

smb: server: let send_done handle a completion without IB_SEND_SIGNALED

Critical · published April 24, 2026

CVSS v3.1
9.8
EPSS
1%
Percentile
50.5
In the wild
Unconfirmed
What it is

In the Linux kernel, the following vulnerability has been resolved:

smb: server: let send_done handle a completion without IB_SEND_SIGNALED

With smbdirect_send_batch processing we likely have requests without

IB_SEND_SIGNALED, which will be destroyed in the final request

that has IB_SEND_SIGNALED set.

If the connection is broken all requests are signaled

even without explicit IB_SEND_SIGNALED.

The record
Technical detail
CVSS v3.1
9.8 · CRITICAL
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CVSS v4.0
Not supplied
EPSS
0.00649 · 50.5th percentile
Published
2026-04-24T14:30Z
EPSS history
Timeline
  • 24 APR 14:30Z
    smb: server: let send_done handle a completion without IB_SEND_SIGNALED
    cvelistv5