Log in Start free

Vulnerability · Published Oct 6, 2026 · Assigned by Linux

CVE-2026-98167smb: client: fix server->total_read for compound encrypted PDUs

Unrated

In plain English

A security flaw in Linux from Linux. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 13% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS )–Not rated
Exploit odds (30 days)0.2%top 87.2% of all CVEs
Exploited in the wildNo reportsnot in CISA KEV
Attack toolingNoneno public tooling known

Official description

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.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Debian:12linux6.1.190-1DEBIAN-CVE-2026-98167
Debian:13linux6.12.113-1DEBIAN-CVE-2026-98167
Debian:14linux7.2.8-1DEBIAN-CVE-2026-98167
Debian:12linux-6.126.12.113-1~deb12u1DEBIAN-CVE-2026-98167
Ubuntu:22.04:LTSlinuxno fix listedUBUNTU-CVE-2026-98167
Ubuntu:24.04:LTSlinuxno fix listedUBUNTU-CVE-2026-98167
Ubuntu:26.04:LTSlinux7.0.0-42.42UBUNTU-CVE-2026-98167
Ubuntu:22.04:LTSlinux-allwinner-5.19no fix listedUBUNTU-CVE-2026-98167
Ubuntu:22.04:LTSlinux-awsno fix listedUBUNTU-CVE-2026-98167
Ubuntu:24.04:LTSlinux-awsno fix listedUBUNTU-CVE-2026-98167
Ubuntu:26.04:LTSlinux-aws7.0.0-1016.17UBUNTU-CVE-2026-98167
Ubuntu:22.04:LTSlinux-aws-5.19no fix listedUBUNTU-CVE-2026-98167
Ubuntu:24.04:LTSlinux-aws-6.14no fix listedUBUNTU-CVE-2026-98167
Ubuntu:24.04:LTSlinux-aws-6.17no fix listedUBUNTU-CVE-2026-98167
Ubuntu:22.04:LTSlinux-aws-6.2no fix listedUBUNTU-CVE-2026-98167
Ubuntu:22.04:LTSlinux-aws-6.5no fix listedUBUNTU-CVE-2026-98167
Ubuntu:22.04:LTSlinux-aws-6.8no fix listedUBUNTU-CVE-2026-98167
Ubuntu:24.04:LTSlinux-aws-7.0no fix listedUBUNTU-CVE-2026-98167
Ubuntu:22.04:LTSlinux-azureno fix listedUBUNTU-CVE-2026-98167
Ubuntu:24.04:LTSlinux-azureno fix listedUBUNTU-CVE-2026-98167
Ubuntu:26.04:LTSlinux-azureno fix listedUBUNTU-CVE-2026-98167
Ubuntu:22.04:LTSlinux-azure-5.19no fix listedUBUNTU-CVE-2026-98167
Ubuntu:24.04:LTSlinux-azure-6.11no fix listedUBUNTU-CVE-2026-98167
Ubuntu:24.04:LTSlinux-azure-6.14no fix listedUBUNTU-CVE-2026-98167
Ubuntu:24.04:LTSlinux-azure-6.17no fix listedUBUNTU-CVE-2026-98167
Ubuntu:22.04:LTSlinux-azure-6.2no fix listedUBUNTU-CVE-2026-98167
Ubuntu:22.04:LTSlinux-azure-6.5no fix listedUBUNTU-CVE-2026-98167
Ubuntu:22.04:LTSlinux-azure-6.8no fix listedUBUNTU-CVE-2026-98167
Ubuntu:24.04:LTSlinux-azure-7.0no fix listedUBUNTU-CVE-2026-98167
Ubuntu:22.04:LTSlinux-azure-fdeno fix listedUBUNTU-CVE-2026-98167
Ubuntu:24.04:LTSlinux-azure-fdeno fix listedUBUNTU-CVE-2026-98167
Ubuntu:26.04:LTSlinux-azure-fdeno fix listedUBUNTU-CVE-2026-98167
Ubuntu:22.04:LTSlinux-azure-fde-5.19no fix listedUBUNTU-CVE-2026-98167
Ubuntu:24.04:LTSlinux-azure-fde-6.14no fix listedUBUNTU-CVE-2026-98167
Ubuntu:24.04:LTSlinux-azure-fde-6.17no fix listedUBUNTU-CVE-2026-98167
Ubuntu:22.04:LTSlinux-azure-fde-6.2no fix listedUBUNTU-CVE-2026-98167
Ubuntu:22.04:LTSlinux-azure-fde-6.8no fix listedUBUNTU-CVE-2026-98167
Ubuntu:24.04:LTSlinux-azure-fde-7.0no fix listedUBUNTU-CVE-2026-98167
Ubuntu:24.04:LTSlinux-azure-nvidiano fix listedUBUNTU-CVE-2026-98167
Ubuntu:24.04:LTSlinux-azure-nvidia-6.14no fix listedUBUNTU-CVE-2026-98167
Ubuntu:22.04:LTSlinux-gcpno fix listedUBUNTU-CVE-2026-98167
Ubuntu:24.04:LTSlinux-gcpno fix listedUBUNTU-CVE-2026-98167
Ubuntu:26.04:LTSlinux-gcp7.0.0-1016.18UBUNTU-CVE-2026-98167
Ubuntu:22.04:LTSlinux-gcp-5.19no fix listedUBUNTU-CVE-2026-98167
Ubuntu:24.04:LTSlinux-gcp-6.11no fix listedUBUNTU-CVE-2026-98167
Ubuntu:24.04:LTSlinux-gcp-6.14no fix listedUBUNTU-CVE-2026-98167
Ubuntu:24.04:LTSlinux-gcp-6.17no fix listedUBUNTU-CVE-2026-98167
Ubuntu:22.04:LTSlinux-gcp-6.2no fix listedUBUNTU-CVE-2026-98167
Ubuntu:22.04:LTSlinux-gcp-6.5no fix listedUBUNTU-CVE-2026-98167
Ubuntu:22.04:LTSlinux-gcp-6.8no fix listedUBUNTU-CVE-2026-98167
Ubuntu:24.04:LTSlinux-gcp-7.0no fix listedUBUNTU-CVE-2026-98167
Ubuntu:22.04:LTSlinux-gkeno fix listedUBUNTU-CVE-2026-98167
Ubuntu:24.04:LTSlinux-gkeno fix listedUBUNTU-CVE-2026-98167
Ubuntu:26.04:LTSlinux-gkeno fix listedUBUNTU-CVE-2026-98167
Ubuntu:22.04:LTSlinux-gkeopno fix listedUBUNTU-CVE-2026-98167
Ubuntu:24.04:LTSlinux-gkeopno fix listedUBUNTU-CVE-2026-98167
Ubuntu:22.04:LTSlinux-hwe-5.19no fix listedUBUNTU-CVE-2026-98167
Ubuntu:24.04:LTSlinux-hwe-6.11no fix listedUBUNTU-CVE-2026-98167
Ubuntu:24.04:LTSlinux-hwe-6.14no fix listedUBUNTU-CVE-2026-98167
Ubuntu:24.04:LTSlinux-hwe-6.17no fix listedUBUNTU-CVE-2026-98167
Ubuntu:22.04:LTSlinux-hwe-6.2no fix listedUBUNTU-CVE-2026-98167
Ubuntu:22.04:LTSlinux-hwe-6.5no fix listedUBUNTU-CVE-2026-98167
Ubuntu:22.04:LTSlinux-hwe-6.8no fix listedUBUNTU-CVE-2026-98167
Ubuntu:24.04:LTSlinux-hwe-7.07.0.0-42.42~24.04.1UBUNTU-CVE-2026-98167
Ubuntu:22.04:LTSlinux-ibmno fix listedUBUNTU-CVE-2026-98167
Ubuntu:24.04:LTSlinux-ibmno fix listedUBUNTU-CVE-2026-98167
Ubuntu:26.04:LTSlinux-ibm7.0.0-1017.17UBUNTU-CVE-2026-98167
Ubuntu:22.04:LTSlinux-ibm-6.8no fix listedUBUNTU-CVE-2026-98167
Ubuntu:22.04:LTSlinux-intel-iot-realtimeno fix listedUBUNTU-CVE-2026-98167
Ubuntu:22.04:LTSlinux-intel-iotgno fix listedUBUNTU-CVE-2026-98167
Ubuntu:22.04:LTSlinux-kvmno fix listedUBUNTU-CVE-2026-98167
Ubuntu:22.04:LTSlinux-lowlatencyno fix listedUBUNTU-CVE-2026-98167
Ubuntu:24.04:LTSlinux-lowlatencyno fix listedUBUNTU-CVE-2026-98167
Ubuntu:22.04:LTSlinux-lowlatency-hwe-5.19no fix listedUBUNTU-CVE-2026-98167
Ubuntu:24.04:LTSlinux-lowlatency-hwe-6.11no fix listedUBUNTU-CVE-2026-98167
Ubuntu:22.04:LTSlinux-lowlatency-hwe-6.2no fix listedUBUNTU-CVE-2026-98167
Ubuntu:22.04:LTSlinux-lowlatency-hwe-6.5no fix listedUBUNTU-CVE-2026-98167
Ubuntu:22.04:LTSlinux-lowlatency-hwe-6.8no fix listedUBUNTU-CVE-2026-98167
Ubuntu:22.04:LTSlinux-nvidiano fix listedUBUNTU-CVE-2026-98167
Ubuntu:24.04:LTSlinux-nvidiano fix listedUBUNTU-CVE-2026-98167
Ubuntu:26.04:LTSlinux-nvidiano fix listedUBUNTU-CVE-2026-98167
Ubuntu:24.04:LTSlinux-nvidia-6.11no fix listedUBUNTU-CVE-2026-98167
Ubuntu:24.04:LTSlinux-nvidia-6.17no fix listedUBUNTU-CVE-2026-98167
Ubuntu:22.04:LTSlinux-nvidia-6.2no fix listedUBUNTU-CVE-2026-98167
Ubuntu:22.04:LTSlinux-nvidia-6.5no fix listedUBUNTU-CVE-2026-98167
Ubuntu:22.04:LTSlinux-nvidia-6.8no fix listedUBUNTU-CVE-2026-98167
Ubuntu:24.04:LTSlinux-nvidia-7.0no fix listedUBUNTU-CVE-2026-98167
Ubuntu:26.04:LTSlinux-nvidia-bosno fix listedUBUNTU-CVE-2026-98167
Ubuntu:24.04:LTSlinux-nvidia-lowlatencyno fix listedUBUNTU-CVE-2026-98167
Ubuntu:22.04:LTSlinux-nvidia-tegrano fix listedUBUNTU-CVE-2026-98167
Ubuntu:24.04:LTSlinux-nvidia-tegrano fix listedUBUNTU-CVE-2026-98167
Ubuntu:22.04:LTSlinux-nvidia-tegra-igxno fix listedUBUNTU-CVE-2026-98167
Ubuntu:22.04:LTSlinux-oem-5.17no fix listedUBUNTU-CVE-2026-98167
Ubuntu:22.04:LTSlinux-oem-6.0no fix listedUBUNTU-CVE-2026-98167
Ubuntu:22.04:LTSlinux-oem-6.1no fix listedUBUNTU-CVE-2026-98167
Ubuntu:24.04:LTSlinux-oem-6.11no fix listedUBUNTU-CVE-2026-98167
Ubuntu:24.04:LTSlinux-oem-6.14no fix listedUBUNTU-CVE-2026-98167
Ubuntu:24.04:LTSlinux-oem-6.17no fix listedUBUNTU-CVE-2026-98167
Ubuntu:22.04:LTSlinux-oem-6.5no fix listedUBUNTU-CVE-2026-98167
Ubuntu:24.04:LTSlinux-oem-6.8no fix listedUBUNTU-CVE-2026-98167
Ubuntu:26.04:LTSlinux-oem-7.07.0.0-1017.17UBUNTU-CVE-2026-98167
Ubuntu:22.04:LTSlinux-oracleno fix listedUBUNTU-CVE-2026-98167
Ubuntu:24.04:LTSlinux-oracleno fix listedUBUNTU-CVE-2026-98167
Ubuntu:26.04:LTSlinux-oracle7.0.0-1015.16UBUNTU-CVE-2026-98167
Ubuntu:24.04:LTSlinux-oracle-6.14no fix listedUBUNTU-CVE-2026-98167
Ubuntu:24.04:LTSlinux-oracle-6.17no fix listedUBUNTU-CVE-2026-98167
Ubuntu:22.04:LTSlinux-oracle-6.5no fix listedUBUNTU-CVE-2026-98167
Ubuntu:22.04:LTSlinux-oracle-6.8no fix listedUBUNTU-CVE-2026-98167
Ubuntu:24.04:LTSlinux-oracle-7.0no fix listedUBUNTU-CVE-2026-98167
Ubuntu:22.04:LTSlinux-raspino fix listedUBUNTU-CVE-2026-98167
Ubuntu:24.04:LTSlinux-raspino fix listedUBUNTU-CVE-2026-98167
Ubuntu:26.04:LTSlinux-raspino fix listedUBUNTU-CVE-2026-98167
Ubuntu:24.04:LTSlinux-raspi-realtimeno fix listedUBUNTU-CVE-2026-98167
Ubuntu:22.04:LTSlinux-realtimeno fix listedUBUNTU-CVE-2026-98167
Ubuntu:24.04:LTSlinux-realtimeno fix listedUBUNTU-CVE-2026-98167
Ubuntu:26.04:LTSlinux-realtimeno fix listedUBUNTU-CVE-2026-98167
Ubuntu:22.04:LTSlinux-riscvno fix listedUBUNTU-CVE-2026-98167
Ubuntu:24.04:LTSlinux-riscvno fix listedUBUNTU-CVE-2026-98167
Ubuntu:26.04:LTSlinux-riscv7.0.0-42.42.1UBUNTU-CVE-2026-98167
Ubuntu:22.04:LTSlinux-riscv-5.19no fix listedUBUNTU-CVE-2026-98167
Ubuntu:24.04:LTSlinux-riscv-6.14no fix listedUBUNTU-CVE-2026-98167
Ubuntu:24.04:LTSlinux-riscv-6.17no fix listedUBUNTU-CVE-2026-98167
Ubuntu:22.04:LTSlinux-riscv-6.5no fix listedUBUNTU-CVE-2026-98167
Ubuntu:22.04:LTSlinux-riscv-6.8no fix listedUBUNTU-CVE-2026-98167
Ubuntu:24.04:LTSlinux-riscv-7.07.0.0-42.42.1~24.04.1UBUNTU-CVE-2026-98167
Ubuntu:22.04:LTSlinux-starfive-5.19no fix listedUBUNTU-CVE-2026-98167
Ubuntu:22.04:LTSlinux-starfive-6.2no fix listedUBUNTU-CVE-2026-98167
Ubuntu:22.04:LTSlinux-starfive-6.5no fix listedUBUNTU-CVE-2026-98167
Ubuntu:24.04:LTSlinux-vmwareno fix listedUBUNTU-CVE-2026-98167
Ubuntu:24.04:LTSlinux-xilinxno fix listedUBUNTU-CVE-2026-98167
Ubuntu:22.04:LTSlinux-xilinx-zynqmpno fix listedUBUNTU-CVE-2026-98167

Affected products (as reported)

VendorProductVersions
Linux Linux b24df3e30cbf48255db866720fb71f14bf9d2f39 – before 8703539d22fdbc13dd2db090ee199c3a427b8ea0b24df3e30cbf48255db866720fb71f14bf9d2f39 – before e78fc1d240b27349b45a0f1c3e3c2c401d7e230db24df3e30cbf48255db866720fb71f14bf9d2f39 – before a46eb242e9eef3a3897d166748b23303c516e870b24df3e30cbf48255db866720fb71f14bf9d2f39 – before ebb8a075fdc7af3d196a4f158a0e18dbc394c0e3b24df3e30cbf48255db866720fb71f14bf9d2f39 – before 282b72f9a7ef31296c48366db4128882999cc048b24df3e30cbf48255db866720fb71f14bf9d2f39 – before f73726b83e4756fdaa099e1bc1143293bd57ad79
Linux Linux 4.19

References