In the Linux kernel, the following vulnerability has been resolved:
smb: client: fix server->total_read for compound encrypted PDUs
In receive_encrypted_standard(), server->total_read is left at the full decrypted frame size when walking sub-PDUs of a compound encrypted frame. As a result, cifs_handle_standard() passes this full size to smb2_check_message(), causing the PDU length guards to incorrectly validate the entire compound frame instead of the current sub-PDU.
This allows truncated non-last sub-PDUs to bypass length validation, leading to out-of-bounds reads in smb2_get_data_area_len().
Fix this by setting server->total_read to the true length of the current sub-PDU: next_cmd for non-last sub-PDUs, and the remaining pdu_length for the last one.
Covered by Rapid7
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Amazon_linux_2023 | — | Upgrade bpftool-debuginfoUpgrade bpftoolUpgrade python3-perf-debuginfoUpgrade kernel-debuginfo-common-aarch64Upgrade kernel-modules-extra-commonUpgrade microvm-kernelUpgrade perfUpgrade kernel-toolsUpgrade kernel-develUpgrade perf-debuginfoUpgrade kernel-debuginfoUpgrade kernel-headersUpgrade kernelUpgrade kernel-tools-develUpgrade kernel-livepatch-6.1.189-236.399Upgrade kernel-modules-extraUpgrade kernel-debuginfo-common-x86_64Upgrade python3-perfUpgrade kernel-tools-debuginfo | Nov 2, 2026 | Oct 6, 2026 |
| Debian | — | Upgrade linuxUpgrade linux-6.12 | Oct 20, 2026 | Oct 6, 2026 |
| Redhat_linux | — | No solution exists | Oct 8, 2026 | Oct 6, 2026 |
| Ubuntu | — | Upgrade linux-oracleUpgrade linux-ibmUpgrade linuxUpgrade linux-riscv-7.0Upgrade linux-gcpUpgrade linux-hwe-7.0Upgrade linux-awsUpgrade linux-oem-7.0Upgrade linux-riscv | Nov 3, 2026 | Oct 6, 2026 |
| Vmware Photon_os | — | Use 'tdnf update' to upgrade all packages to the latest version. | Oct 13, 2026 | Oct 6, 2026 |
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