CVE-2026-46155
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…
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (0.48%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
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 3.1
- 9.1 CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
- EPSS
- 0.48% probability · 40th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-125
- Affected
- linux/linux kernel
- Source
- 416baaa9-dc9f-4396-8d5f-8c081fb06d67
References
- https://git.kernel.org/stable/c/512d33bc8ea4ea5c19728ee118715f4b1f4d1926Patch
- https://git.kernel.org/stable/c/8d09328dfda089675e4c049f3f256064a1d1996bPatch
- https://git.kernel.org/stable/c/9b3af35645ff9cd334edc130249f9a2fb2bea25fPatch
- https://git.kernel.org/stable/c/a16f70a71be4b5a4eccf39a9bf09b47285f4cb7cPatch
- https://git.kernel.org/stable/c/dffb44b2e06a2908e249f0f93156fc987eee1d1cPatch
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.