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Vulnerability · Published May 1, 2025 · Assigned by Linux

CVE-2025-37776ksmbd: fix use-after-free in smb_break_all_levII_oplock()

High 8.8

In plain English

A high-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 30% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)8.8High
Exploit odds (30 days)0.4%top 70.0% 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: ksmbd: fix use-after-free in smb_break_all_levII_oplock() There is a room in smb_break_all_levII_oplock that can cause racy issues when unlocking in the middle of the loop. This patch use read lock to protect whole loop.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Debian:12linuxno fix listedDEBIAN-CVE-2025-37776
Debian:13linux6.12.25-1DEBIAN-CVE-2025-37776
Debian:14linux6.12.25-1DEBIAN-CVE-2025-37776
Ubuntu:22.04:LTSlinuxno fix listedUBUNTU-CVE-2025-37776
Ubuntu:24.04:LTSlinuxno fix listedUBUNTU-CVE-2025-37776
Ubuntu:22.04:LTSlinux-allwinner-5.19no fix listedUBUNTU-CVE-2025-37776
Ubuntu:22.04:LTSlinux-awsno fix listedUBUNTU-CVE-2025-37776
Ubuntu:24.04:LTSlinux-awsno fix listedUBUNTU-CVE-2025-37776
Ubuntu:22.04:LTSlinux-aws-5.19no fix listedUBUNTU-CVE-2025-37776
Ubuntu:22.04:LTSlinux-aws-6.2no fix listedUBUNTU-CVE-2025-37776
Ubuntu:22.04:LTSlinux-aws-6.5no fix listedUBUNTU-CVE-2025-37776
Ubuntu:22.04:LTSlinux-aws-6.8no fix listedUBUNTU-CVE-2025-37776
Ubuntu:22.04:LTSlinux-azureno fix listedUBUNTU-CVE-2025-37776
Ubuntu:24.04:LTSlinux-azureno fix listedUBUNTU-CVE-2025-37776
Ubuntu:22.04:LTSlinux-azure-5.19no fix listedUBUNTU-CVE-2025-37776
Ubuntu:24.04:LTSlinux-azure-6.11no fix listedUBUNTU-CVE-2025-37776
Ubuntu:22.04:LTSlinux-azure-6.2no fix listedUBUNTU-CVE-2025-37776
Ubuntu:22.04:LTSlinux-azure-6.5no fix listedUBUNTU-CVE-2025-37776
Ubuntu:22.04:LTSlinux-azure-6.8no fix listedUBUNTU-CVE-2025-37776
Ubuntu:22.04:LTSlinux-azure-fdeno fix listedUBUNTU-CVE-2025-37776
Ubuntu:24.04:LTSlinux-azure-fdeno fix listedUBUNTU-CVE-2025-37776
Ubuntu:25.10linux-azure-fdeno fix listedUBUNTU-CVE-2025-37776
Ubuntu:22.04:LTSlinux-azure-fde-5.19no fix listedUBUNTU-CVE-2025-37776
Ubuntu:24.04:LTSlinux-azure-fde-6.17no fix listedUBUNTU-CVE-2025-37776
Ubuntu:22.04:LTSlinux-azure-fde-6.2no fix listedUBUNTU-CVE-2025-37776
Ubuntu:22.04:LTSlinux-azure-fde-6.8no fix listedUBUNTU-CVE-2025-37776
Ubuntu:24.04:LTSlinux-azure-nvidiano fix listedUBUNTU-CVE-2025-37776
Ubuntu:22.04:LTSlinux-gcpno fix listedUBUNTU-CVE-2025-37776
Ubuntu:24.04:LTSlinux-gcpno fix listedUBUNTU-CVE-2025-37776
Ubuntu:22.04:LTSlinux-gcp-5.19no fix listedUBUNTU-CVE-2025-37776
Ubuntu:24.04:LTSlinux-gcp-6.11no fix listedUBUNTU-CVE-2025-37776
Ubuntu:22.04:LTSlinux-gcp-6.2no fix listedUBUNTU-CVE-2025-37776
Ubuntu:22.04:LTSlinux-gcp-6.5no fix listedUBUNTU-CVE-2025-37776
Ubuntu:22.04:LTSlinux-gcp-6.8no fix listedUBUNTU-CVE-2025-37776
Ubuntu:22.04:LTSlinux-gkeno fix listedUBUNTU-CVE-2025-37776
Ubuntu:24.04:LTSlinux-gkeno fix listedUBUNTU-CVE-2025-37776
Ubuntu:22.04:LTSlinux-gkeopno fix listedUBUNTU-CVE-2025-37776
Ubuntu:24.04:LTSlinux-gkeopno fix listedUBUNTU-CVE-2025-37776
Ubuntu:22.04:LTSlinux-hwe-5.19no fix listedUBUNTU-CVE-2025-37776
Ubuntu:24.04:LTSlinux-hwe-6.11no fix listedUBUNTU-CVE-2025-37776
Ubuntu:22.04:LTSlinux-hwe-6.2no fix listedUBUNTU-CVE-2025-37776
Ubuntu:22.04:LTSlinux-hwe-6.5no fix listedUBUNTU-CVE-2025-37776
Ubuntu:22.04:LTSlinux-hwe-6.8no fix listedUBUNTU-CVE-2025-37776
Ubuntu:22.04:LTSlinux-ibmno fix listedUBUNTU-CVE-2025-37776
Ubuntu:24.04:LTSlinux-ibmno fix listedUBUNTU-CVE-2025-37776
Ubuntu:22.04:LTSlinux-ibm-6.8no fix listedUBUNTU-CVE-2025-37776
Ubuntu:24.04:LTSlinux-intelno fix listedUBUNTU-CVE-2025-37776
Ubuntu:22.04:LTSlinux-intel-iot-realtimeno fix listedUBUNTU-CVE-2025-37776
Ubuntu:22.04:LTSlinux-intel-iotgno fix listedUBUNTU-CVE-2025-37776
Ubuntu:22.04:LTSlinux-kvmno fix listedUBUNTU-CVE-2025-37776
Ubuntu:22.04:LTSlinux-lowlatencyno fix listedUBUNTU-CVE-2025-37776
Ubuntu:24.04:LTSlinux-lowlatencyno fix listedUBUNTU-CVE-2025-37776
Ubuntu:22.04:LTSlinux-lowlatency-hwe-5.19no fix listedUBUNTU-CVE-2025-37776
Ubuntu:24.04:LTSlinux-lowlatency-hwe-6.11no fix listedUBUNTU-CVE-2025-37776
Ubuntu:22.04:LTSlinux-lowlatency-hwe-6.2no fix listedUBUNTU-CVE-2025-37776
Ubuntu:22.04:LTSlinux-lowlatency-hwe-6.5no fix listedUBUNTU-CVE-2025-37776
Ubuntu:22.04:LTSlinux-lowlatency-hwe-6.8no fix listedUBUNTU-CVE-2025-37776
Ubuntu:22.04:LTSlinux-nvidiano fix listedUBUNTU-CVE-2025-37776
Ubuntu:24.04:LTSlinux-nvidiano fix listedUBUNTU-CVE-2025-37776
Ubuntu:24.04:LTSlinux-nvidia-6.11no fix listedUBUNTU-CVE-2025-37776
Ubuntu:22.04:LTSlinux-nvidia-6.2no fix listedUBUNTU-CVE-2025-37776
Ubuntu:22.04:LTSlinux-nvidia-6.5no fix listedUBUNTU-CVE-2025-37776
Ubuntu:22.04:LTSlinux-nvidia-6.8no fix listedUBUNTU-CVE-2025-37776
Ubuntu:24.04:LTSlinux-nvidia-lowlatencyno fix listedUBUNTU-CVE-2025-37776
Ubuntu:22.04:LTSlinux-nvidia-tegrano fix listedUBUNTU-CVE-2025-37776
Ubuntu:24.04:LTSlinux-nvidia-tegra6.8.0-1035.38USN-8781-1
Ubuntu:24.04:LTSlinux-nvidia-tegra6.8.0-1035.38UBUNTU-CVE-2025-37776
Ubuntu:22.04:LTSlinux-nvidia-tegra-igxno fix listedUBUNTU-CVE-2025-37776
Ubuntu:22.04:LTSlinux-oem-5.17no fix listedUBUNTU-CVE-2025-37776
Ubuntu:22.04:LTSlinux-oem-6.0no fix listedUBUNTU-CVE-2025-37776
Ubuntu:22.04:LTSlinux-oem-6.1no fix listedUBUNTU-CVE-2025-37776
Ubuntu:24.04:LTSlinux-oem-6.11no fix listedUBUNTU-CVE-2025-37776
Ubuntu:22.04:LTSlinux-oem-6.5no fix listedUBUNTU-CVE-2025-37776
Ubuntu:24.04:LTSlinux-oem-6.8no fix listedUBUNTU-CVE-2025-37776
Ubuntu:22.04:LTSlinux-oracleno fix listedUBUNTU-CVE-2025-37776
Ubuntu:24.04:LTSlinux-oracleno fix listedUBUNTU-CVE-2025-37776
Ubuntu:22.04:LTSlinux-oracle-6.5no fix listedUBUNTU-CVE-2025-37776
Ubuntu:22.04:LTSlinux-oracle-6.8no fix listedUBUNTU-CVE-2025-37776
Ubuntu:22.04:LTSlinux-raspino fix listedUBUNTU-CVE-2025-37776
Ubuntu:24.04:LTSlinux-raspino fix listedUBUNTU-CVE-2025-37776
Ubuntu:24.04:LTSlinux-raspi-realtimeno fix listedUBUNTU-CVE-2025-37776
Ubuntu:22.04:LTSlinux-realtimeno fix listedUBUNTU-CVE-2025-37776
Ubuntu:24.04:LTSlinux-realtimeno fix listedUBUNTU-CVE-2025-37776
Ubuntu:22.04:LTSlinux-riscvno fix listedUBUNTU-CVE-2025-37776
Ubuntu:24.04:LTSlinux-riscvno fix listedUBUNTU-CVE-2025-37776
Ubuntu:22.04:LTSlinux-riscv-5.19no fix listedUBUNTU-CVE-2025-37776
Ubuntu:22.04:LTSlinux-riscv-6.5no fix listedUBUNTU-CVE-2025-37776
Ubuntu:22.04:LTSlinux-riscv-6.8no fix listedUBUNTU-CVE-2025-37776
Ubuntu:22.04:LTSlinux-starfive-5.19no fix listedUBUNTU-CVE-2025-37776
Ubuntu:22.04:LTSlinux-starfive-6.2no fix listedUBUNTU-CVE-2025-37776
Ubuntu:22.04:LTSlinux-starfive-6.5no fix listedUBUNTU-CVE-2025-37776
Ubuntu:24.04:LTSlinux-vmwareno fix listedUBUNTU-CVE-2025-37776
Ubuntu:24.04:LTSlinux-xilinxno fix listedUBUNTU-CVE-2025-37776
Ubuntu:22.04:LTSlinux-xilinx-zynqmpno fix listedUBUNTU-CVE-2025-37776

Affected products (as reported)

VendorProductVersions
Linux Linux 0626e6641f6b467447c81dd7678a69c66f7746cf – before 296cb5457cc6f4a754c4ae29855f8a253d52bcc60626e6641f6b467447c81dd7678a69c66f7746cf – before d54ab1520d43e95f9b2e22d7a05fc9614192e5a50626e6641f6b467447c81dd7678a69c66f7746cf – before d73686367ad68534257cd88a36ca3c52cb8b81d80626e6641f6b467447c81dd7678a69c66f7746cf – before 18b4fac5ef17f77fed9417d22210ceafd6525fc7
Linux Linux 5.15

References