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CVE

CVE-2026-46155

smb/client: fix out-of-bounds read in smb2_compound_op()
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CVE

CVE-2026-46155

smb/client: fix out-of-bounds read in smb2_compound_op()

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

smb/client: fix out-of-bounds read in smb2compoundop()

If a server sends a truncated response but a large OutputBufferLength, and

terminates the EA list early, checkwsleas() returns success without

validating that the entire OutputBufferLength fits within iov_len.

Then smb2compoundop() 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.

Package Versions Affected

Package Version
patch Availability
No items found.

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CVSS Version

Severity
Base Score
CVSS Version
Score Vector
C
H
U
9.1
-
3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
C
H
U
0
-
3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
C
H
U
-

Related Resources

No items found.

References

https://git.kernel.org/stable/c/512d33bc8ea4ea5c19728ee118715f4b1f4d1926, https://git.kernel.org/stable/c/8d09328dfda089675e4c049f3f256064a1d1996b, https://git.kernel.org/stable/c/9b3af35645ff9cd334edc130249f9a2fb2bea25f, https://git.kernel.org/stable/c/a16f70a71be4b5a4eccf39a9bf09b47285f4cb7c, https://git.kernel.org/stable/c/dffb44b2e06a2908e249f0f93156fc987eee1d1c, https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/46xxx/CVE-2026-46155.json, https://nvd.nist.gov/vuln/detail/CVE-2026-46155, https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git

Severity

9.1

CVSS Score
0
10

Basic Information

Base CVSS
9.1
EPSS Probability
0.00478%
EPSS Percentile
0.39481%
Introduced Version
7449d736bbbd160c76b01b8fcdf72f58a8757d4b,ea41367b2a602f602ea6594fc4a310520dcc64f4,6.6.32,0,6.7.0,6.9.0,6.13.0
Fix Available
dffb44b2e06a2908e249f0f93156fc987eee1d1c,8d09328dfda089675e4c049f3f256064a1d1996b,6.6.140,6.12.88,6.18.30,7.0.7,0:5.14.0-687.22.1.el9_8,6.12.88-1,7.0.0-28.28~24.04.1,1:6.12.88-119.157.amzn2023,1:1.0-0.amzn2023,1:6.18.30-61.116.amzn2023

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