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In the Linux kernel, the following vulnerability has been resolved:
ksmbd: avoid out of bounds access in decode_preauth_ctxt()
Confirm that the accessed pneg_ctxt->HashAlgorithms address sits within the SMB request boundary; deassemble_neg_contexts() only checks that the eight byte smb2_neg_context header + (client controlled) DataLength are within the packet boundary, which is insufficient.
Checking for sizeof(struct smb2_preauth_neg_context) is overkill given that the type currently assumes SMB311_SALT_SIZE bytes of trailing Salt.
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Debian | — | Upgrade linux | Dec 31, 2025 | Dec 31, 2025 |
| Ubuntu | — | Upgrade linux-nvidiaUpgrade linux-gcp-fipsUpgrade linux-nvidia-tegra-igxUpgrade linux-xilinx-zynqmpUpgrade linux-intel-iotg-5.15Upgrade linux-azure-5.15Upgrade linux-realtimeUpgrade linux-kvmUpgrade linux-azure-fipsUpgrade linux-azureUpgrade linux-oracleUpgrade linux-intel-iot-realtimeUpgrade linux-gcp-5.15Upgrade linux-gkeopUpgrade linux-ibmUpgrade linux-aws-fipsUpgrade linux-hwe-5.15Upgrade linux-oracle-5.15Upgrade linux-riscv-5.15Upgrade linux-awsUpgrade linux-fipsUpgrade linux-gkeUpgrade linux-aws-5.15Upgrade linux-lowlatencyUpgrade linux-intel-iotgUpgrade linuxUpgrade linux-raspiUpgrade linux-gcpUpgrade linux-bluefieldUpgrade linux-nvidia-tegra-5.15Upgrade linux-ibm-5.15Upgrade linux-azure-fdeUpgrade linux-nvidia-tegraUpgrade linux-lowlatency-hwe-5.15 | Jan 6, 2026 | Jan 2, 2026 |
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