CVE-2026-46155 smb/client: fix out-of-bounds read in smb2_compound_op()

What is CVE-2026-46155?

CVE-2026-46155 is a critical vulnerability in Linux kernel, published on 28 May 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official 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.

Weakness: CWE-125

Which versions are affected by CVE-2026-46155?

It affects 1 product.

Products include Linux kernel.

How do I fix CVE-2026-46155?

Apply the vendor's patch.

Is CVE-2026-46155 being exploited?

There is no known exploitation of CVE-2026-46155 in the wild and no public exploit code.

Other vulnerabilities in Linux kernel

• CVE-2026-53266 Linux Kernel Out-of-Bounds Write Exploited High 8.8
• CVE-2013-6282 Linux Kernel Improper Input Validation Exploited High 8.8
• CVE-2022-0185 Linux Kernel Heap-Based Buffer Overflow Exploited High 8.4
• CVE-2013-2094 Linux Kernel Privilege Escalation Exploited High 8.4
• CVE-2026-53362 Linux Kernel Unspecified Exploited High 7.8

All Linux kernel vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as AZL-88854, BELL-CVE-2026-46155, DEBIAN-CVE-2026-46155, GHSA-r5mc-mc43-5gch, UBUNTU-CVE-2026-46155.