Critical severity · published May 28, 2026
CVE-2026-46155
smb/client: fix out-of-bounds read in smb2_compound_op()
9.1
CVSS
0.5%
EPSS
No
On KEV
Description
In the Linux kernel, the following vulnerability has been resolved: smb/client: fix out-of-bounds read in smb2_compound_op() If a server sends a truncated response but a large OutputBufferLength, and terminates the EA list early, check_wsl_eas() returns success without validating that the entire OutputBufferLength fits within iov_len. Then smb2_compound_op() does: memcpy(idata->wsl.eas, data[0], size[0]); Where size[0] is OutputBufferLength. If iov_len is smaller than size[0], memcpy can read beyond the end of the rsp_iov allocation and leak adjacent kernel heap memory.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
High
Integrity
None
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.5% · higher than 41% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
KE
Kernel · Linux
6.6.32 before 6.6.140; 6.9 before 6.12.88; 6.13 before 6.18.30; 6.19 before 7.0.7; 7.1; 7.1 · source: NVD
LI
Linux · Linux
7449d736bbbd160c76b01b8fcdf72f58a8757d4b before dffb44b2e06a2908e249f0f93156fc987eee1d1c; ea41367b2a602f602ea6594fc4a310520dcc64f4 before 9b3af35645ff9cd334edc130249f9a2fb2bea25f; ea41367b2a602f602ea6594fc4a310520dcc64f4 before 512d33bc8ea4ea5c19728ee118715f4b1f4d1926; ea41367b2a602f602ea6594fc4a310520dcc64f4 before a16f70a71be4b5a4eccf39a9bf09b47285f4cb7c; ea41367b2a602f602ea6594fc4a310520dcc64f4 before 8d09328dfda089675e4c049f3f256064a1d1996b; 6.6.32 before 6.6.140; +1 more · source: vendor