Critical severity · published Apr 24, 2026
CVE-2026-31536
smb: server: let send_done handle a completion without IB_SEND_SIGNALED
9.8
CVSS
0.4%
EPSS
No
On KEV
Description
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.4% · higher than 38% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
KE
Kernel · Linux
5.15 before 6.18.11; 6.19 before 6.19.1 · source: NVD
LI
Linux · Linux
0626e6641f6b467447c81dd7678a69c66f7746cf before 24082642654f3e5149913946e89c00a297a8868f; 0626e6641f6b467447c81dd7678a69c66f7746cf before e38b415c024bc3b6321bf8650dbf3f4aab8e74b3; 0626e6641f6b467447c81dd7678a69c66f7746cf before 9da82dc73cb03e85d716a2609364572367a5ff47; 5.15 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-31536
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-31536
Patch
https://git.kernel.org/stable/c/24082642654f3e5149913946e89c00a297a8868f
Patch
https://git.kernel.org/stable/c/9da82dc73cb03e85d716a2609364572367a5ff47
Patch
https://git.kernel.org/stable/c/e38b415c024bc3b6321bf8650dbf3f4aab8e74b3
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