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Vulnerability · Published Apr 24, 2026 · Assigned by Linux

CVE-2026-31536smb: server: let send_done handle a completion without IB_SEND_SIGNALED

Critical 9.8

In plain English

A critical-severity 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 0.4% (higher than 39% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)9.8Critical
Exploit odds (30 days)0.4%top 61.4% 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: server: let send_done handle a completion without IB_SEND_SIGNALED With smbdirect_send_batch processing we likely have requests without IB_SEND_SIGNALED, which will be destroyed in the final request that has IB_SEND_SIGNALED set. If the connection is broken all requests are signaled even without explicit IB_SEND_SIGNALED.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Debian:12linuxno fix listedDEBIAN-CVE-2026-31536
Debian:13linuxno fix listedDEBIAN-CVE-2026-31536
Debian:14linux6.18.12-1DEBIAN-CVE-2026-31536
Ubuntu:22.04:LTSlinuxno fix listedUBUNTU-CVE-2026-31536
Ubuntu:24.04:LTSlinuxno fix listedUBUNTU-CVE-2026-31536
Ubuntu:25.10linuxno fix listedUBUNTU-CVE-2026-31536
Ubuntu:22.04:LTSlinux-allwinner-5.19no fix listedUBUNTU-CVE-2026-31536
Ubuntu:22.04:LTSlinux-awsno fix listedUBUNTU-CVE-2026-31536
Ubuntu:24.04:LTSlinux-awsno fix listedUBUNTU-CVE-2026-31536
Ubuntu:25.10linux-awsno fix listedUBUNTU-CVE-2026-31536
Ubuntu:22.04:LTSlinux-aws-5.19no fix listedUBUNTU-CVE-2026-31536
Ubuntu:24.04:LTSlinux-aws-6.14no fix listedUBUNTU-CVE-2026-31536
Ubuntu:24.04:LTSlinux-aws-6.17no fix listedUBUNTU-CVE-2026-31536
Ubuntu:22.04:LTSlinux-aws-6.2no fix listedUBUNTU-CVE-2026-31536
Ubuntu:22.04:LTSlinux-aws-6.5no fix listedUBUNTU-CVE-2026-31536
Ubuntu:22.04:LTSlinux-aws-6.8no fix listedUBUNTU-CVE-2026-31536
Ubuntu:22.04:LTSlinux-azureno fix listedUBUNTU-CVE-2026-31536
Ubuntu:24.04:LTSlinux-azureno fix listedUBUNTU-CVE-2026-31536
Ubuntu:25.10linux-azureno fix listedUBUNTU-CVE-2026-31536
Ubuntu:22.04:LTSlinux-azure-5.19no fix listedUBUNTU-CVE-2026-31536
Ubuntu:24.04:LTSlinux-azure-6.11no fix listedUBUNTU-CVE-2026-31536
Ubuntu:24.04:LTSlinux-azure-6.14no fix listedUBUNTU-CVE-2026-31536
Ubuntu:24.04:LTSlinux-azure-6.17no fix listedUBUNTU-CVE-2026-31536
Ubuntu:22.04:LTSlinux-azure-6.2no fix listedUBUNTU-CVE-2026-31536
Ubuntu:22.04:LTSlinux-azure-6.5no fix listedUBUNTU-CVE-2026-31536
Ubuntu:22.04:LTSlinux-azure-6.8no fix listedUBUNTU-CVE-2026-31536
Ubuntu:22.04:LTSlinux-azure-fdeno fix listedUBUNTU-CVE-2026-31536
Ubuntu:24.04:LTSlinux-azure-fdeno fix listedUBUNTU-CVE-2026-31536
Ubuntu:25.10linux-azure-fdeno fix listedUBUNTU-CVE-2026-31536
Ubuntu:22.04:LTSlinux-azure-fde-5.19no fix listedUBUNTU-CVE-2026-31536
Ubuntu:24.04:LTSlinux-azure-fde-6.14no fix listedUBUNTU-CVE-2026-31536
Ubuntu:24.04:LTSlinux-azure-fde-6.17no fix listedUBUNTU-CVE-2026-31536
Ubuntu:22.04:LTSlinux-azure-fde-6.2no fix listedUBUNTU-CVE-2026-31536
Ubuntu:22.04:LTSlinux-azure-fde-6.8no fix listedUBUNTU-CVE-2026-31536
Ubuntu:24.04:LTSlinux-azure-nvidiano fix listedUBUNTU-CVE-2026-31536
Ubuntu:24.04:LTSlinux-azure-nvidia-6.14no fix listedUBUNTU-CVE-2026-31536
Ubuntu:22.04:LTSlinux-gcpno fix listedUBUNTU-CVE-2026-31536
Ubuntu:24.04:LTSlinux-gcpno fix listedUBUNTU-CVE-2026-31536
Ubuntu:25.10linux-gcpno fix listedUBUNTU-CVE-2026-31536
Ubuntu:22.04:LTSlinux-gcp-5.19no fix listedUBUNTU-CVE-2026-31536
Ubuntu:24.04:LTSlinux-gcp-6.11no fix listedUBUNTU-CVE-2026-31536
Ubuntu:24.04:LTSlinux-gcp-6.14no fix listedUBUNTU-CVE-2026-31536
Ubuntu:24.04:LTSlinux-gcp-6.17no fix listedUBUNTU-CVE-2026-31536
Ubuntu:22.04:LTSlinux-gcp-6.2no fix listedUBUNTU-CVE-2026-31536
Ubuntu:22.04:LTSlinux-gcp-6.5no fix listedUBUNTU-CVE-2026-31536
Ubuntu:22.04:LTSlinux-gcp-6.8no fix listedUBUNTU-CVE-2026-31536
Ubuntu:22.04:LTSlinux-gkeno fix listedUBUNTU-CVE-2026-31536
Ubuntu:24.04:LTSlinux-gkeno fix listedUBUNTU-CVE-2026-31536
Ubuntu:22.04:LTSlinux-gkeopno fix listedUBUNTU-CVE-2026-31536
Ubuntu:24.04:LTSlinux-gkeopno fix listedUBUNTU-CVE-2026-31536
Ubuntu:22.04:LTSlinux-hwe-5.19no fix listedUBUNTU-CVE-2026-31536
Ubuntu:24.04:LTSlinux-hwe-6.11no fix listedUBUNTU-CVE-2026-31536
Ubuntu:24.04:LTSlinux-hwe-6.14no fix listedUBUNTU-CVE-2026-31536
Ubuntu:24.04:LTSlinux-hwe-6.17no fix listedUBUNTU-CVE-2026-31536
Ubuntu:22.04:LTSlinux-hwe-6.2no fix listedUBUNTU-CVE-2026-31536
Ubuntu:22.04:LTSlinux-hwe-6.5no fix listedUBUNTU-CVE-2026-31536
Ubuntu:22.04:LTSlinux-hwe-6.8no fix listedUBUNTU-CVE-2026-31536
Ubuntu:22.04:LTSlinux-ibmno fix listedUBUNTU-CVE-2026-31536
Ubuntu:24.04:LTSlinux-ibmno fix listedUBUNTU-CVE-2026-31536
Ubuntu:22.04:LTSlinux-ibm-6.8no fix listedUBUNTU-CVE-2026-31536
Ubuntu:22.04:LTSlinux-intel-iot-realtimeno fix listedUBUNTU-CVE-2026-31536
Ubuntu:22.04:LTSlinux-intel-iotgno fix listedUBUNTU-CVE-2026-31536
Ubuntu:22.04:LTSlinux-kvmno fix listedUBUNTU-CVE-2026-31536
Ubuntu:22.04:LTSlinux-lowlatencyno fix listedUBUNTU-CVE-2026-31536
Ubuntu:24.04:LTSlinux-lowlatencyno fix listedUBUNTU-CVE-2026-31536
Ubuntu:22.04:LTSlinux-lowlatency-hwe-5.19no fix listedUBUNTU-CVE-2026-31536
Ubuntu:24.04:LTSlinux-lowlatency-hwe-6.11no fix listedUBUNTU-CVE-2026-31536
Ubuntu:22.04:LTSlinux-lowlatency-hwe-6.2no fix listedUBUNTU-CVE-2026-31536
Ubuntu:22.04:LTSlinux-lowlatency-hwe-6.5no fix listedUBUNTU-CVE-2026-31536
Ubuntu:22.04:LTSlinux-lowlatency-hwe-6.8no fix listedUBUNTU-CVE-2026-31536
Ubuntu:22.04:LTSlinux-nvidiano fix listedUBUNTU-CVE-2026-31536
Ubuntu:24.04:LTSlinux-nvidiano fix listedUBUNTU-CVE-2026-31536
Ubuntu:24.04:LTSlinux-nvidia-6.11no fix listedUBUNTU-CVE-2026-31536
Ubuntu:24.04:LTSlinux-nvidia-6.17no fix listedUBUNTU-CVE-2026-31536
Ubuntu:22.04:LTSlinux-nvidia-6.2no fix listedUBUNTU-CVE-2026-31536
Ubuntu:22.04:LTSlinux-nvidia-6.5no fix listedUBUNTU-CVE-2026-31536
Ubuntu:22.04:LTSlinux-nvidia-6.8no fix listedUBUNTU-CVE-2026-31536
Ubuntu:24.04:LTSlinux-nvidia-lowlatencyno fix listedUBUNTU-CVE-2026-31536
Ubuntu:22.04:LTSlinux-nvidia-tegrano fix listedUBUNTU-CVE-2026-31536
Ubuntu:24.04:LTSlinux-nvidia-tegrano fix listedUBUNTU-CVE-2026-31536
Ubuntu:22.04:LTSlinux-nvidia-tegra-igxno fix listedUBUNTU-CVE-2026-31536
Ubuntu:22.04:LTSlinux-oem-5.17no fix listedUBUNTU-CVE-2026-31536
Ubuntu:22.04:LTSlinux-oem-6.0no fix listedUBUNTU-CVE-2026-31536
Ubuntu:22.04:LTSlinux-oem-6.1no fix listedUBUNTU-CVE-2026-31536
Ubuntu:24.04:LTSlinux-oem-6.11no fix listedUBUNTU-CVE-2026-31536
Ubuntu:24.04:LTSlinux-oem-6.14no fix listedUBUNTU-CVE-2026-31536
Ubuntu:24.04:LTSlinux-oem-6.17no fix listedUBUNTU-CVE-2026-31536
Ubuntu:22.04:LTSlinux-oem-6.5no fix listedUBUNTU-CVE-2026-31536
Ubuntu:24.04:LTSlinux-oem-6.8no fix listedUBUNTU-CVE-2026-31536
Ubuntu:22.04:LTSlinux-oracleno fix listedUBUNTU-CVE-2026-31536
Ubuntu:24.04:LTSlinux-oracleno fix listedUBUNTU-CVE-2026-31536
Ubuntu:25.10linux-oracleno fix listedUBUNTU-CVE-2026-31536
Ubuntu:24.04:LTSlinux-oracle-6.14no fix listedUBUNTU-CVE-2026-31536
Ubuntu:24.04:LTSlinux-oracle-6.17no fix listedUBUNTU-CVE-2026-31536
Ubuntu:22.04:LTSlinux-oracle-6.5no fix listedUBUNTU-CVE-2026-31536
Ubuntu:22.04:LTSlinux-oracle-6.8no fix listedUBUNTU-CVE-2026-31536
Ubuntu:22.04:LTSlinux-raspino fix listedUBUNTU-CVE-2026-31536
Ubuntu:24.04:LTSlinux-raspino fix listedUBUNTU-CVE-2026-31536
Ubuntu:25.10linux-raspino fix listedUBUNTU-CVE-2026-31536
Ubuntu:24.04:LTSlinux-raspi-realtimeno fix listedUBUNTU-CVE-2026-31536
Ubuntu:22.04:LTSlinux-realtimeno fix listedUBUNTU-CVE-2026-31536
Ubuntu:24.04:LTSlinux-realtimeno fix listedUBUNTU-CVE-2026-31536
Ubuntu:25.10linux-realtimeno fix listedUBUNTU-CVE-2026-31536
Ubuntu:22.04:LTSlinux-riscvno fix listedUBUNTU-CVE-2026-31536
Ubuntu:24.04:LTSlinux-riscvno fix listedUBUNTU-CVE-2026-31536
Ubuntu:25.10linux-riscvno fix listedUBUNTU-CVE-2026-31536
Ubuntu:22.04:LTSlinux-riscv-5.19no fix listedUBUNTU-CVE-2026-31536
Ubuntu:24.04:LTSlinux-riscv-6.14no fix listedUBUNTU-CVE-2026-31536
Ubuntu:24.04:LTSlinux-riscv-6.17no fix listedUBUNTU-CVE-2026-31536
Ubuntu:22.04:LTSlinux-riscv-6.5no fix listedUBUNTU-CVE-2026-31536
Ubuntu:22.04:LTSlinux-riscv-6.8no fix listedUBUNTU-CVE-2026-31536
Ubuntu:22.04:LTSlinux-starfive-5.19no fix listedUBUNTU-CVE-2026-31536
Ubuntu:22.04:LTSlinux-starfive-6.2no fix listedUBUNTU-CVE-2026-31536
Ubuntu:22.04:LTSlinux-starfive-6.5no fix listedUBUNTU-CVE-2026-31536
Ubuntu:24.04:LTSlinux-vmwareno fix listedUBUNTU-CVE-2026-31536
Ubuntu:24.04:LTSlinux-xilinxno fix listedUBUNTU-CVE-2026-31536
Ubuntu:22.04:LTSlinux-xilinx-zynqmpno fix listedUBUNTU-CVE-2026-31536

Affected products (as reported)

VendorProductVersions
Linux Linux 0626e6641f6b467447c81dd7678a69c66f7746cf – before 24082642654f3e5149913946e89c00a297a8868f0626e6641f6b467447c81dd7678a69c66f7746cf – before e38b415c024bc3b6321bf8650dbf3f4aab8e74b30626e6641f6b467447c81dd7678a69c66f7746cf – before 9da82dc73cb03e85d716a2609364572367a5ff47
Linux Linux 5.15

References