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Vulnerability · Published Sep 25, 2026 · Assigned by Linux

CVE-2026-97562smb: client: pin DFS superblock in iterator callback

High 7.5

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 36% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)7.5High
Exploit odds (30 days)0.4%top 64.2% 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: pin DFS superblock in iterator callback tcon_super_cb() stores a raw superblock pointer, but __cifs_get_super() takes its active reference only after iterate_supers_type() has dropped s_umount and its passive reference. Concurrent DFS automount expiry can therefore free the superblock before cifs_sb_active() uses it. A deterministic KASAN test reproduces the race as: BUG: KASAN: slab-use-after-free in cifs_sb_active+0x77/0x80 The same test passes with this change applied. Take the active reference in the callback while iterate_supers_type() still holds s_umount shared. cifs_put_tcp_super() remains the matching release.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Debian:12linuxno fix listedDEBIAN-CVE-2026-97562
Debian:13linux6.12.111-1DEBIAN-CVE-2026-97562
Debian:14linux7.2.7-1DEBIAN-CVE-2026-97562
Debian:12linux-6.126.12.111-1~deb12u1DEBIAN-CVE-2026-97562
Ubuntu:22.04:LTSlinuxno fix listedUBUNTU-CVE-2026-97562
Ubuntu:24.04:LTSlinuxno fix listedUBUNTU-CVE-2026-97562
Ubuntu:26.04:LTSlinux7.0.0-42.42UBUNTU-CVE-2026-97562
Ubuntu:22.04:LTSlinux-allwinner-5.19no fix listedUBUNTU-CVE-2026-97562
Ubuntu:22.04:LTSlinux-awsno fix listedUBUNTU-CVE-2026-97562
Ubuntu:24.04:LTSlinux-awsno fix listedUBUNTU-CVE-2026-97562
Ubuntu:26.04:LTSlinux-aws7.0.0-1016.17UBUNTU-CVE-2026-97562
Ubuntu:22.04:LTSlinux-aws-5.19no fix listedUBUNTU-CVE-2026-97562
Ubuntu:24.04:LTSlinux-aws-6.14no fix listedUBUNTU-CVE-2026-97562
Ubuntu:24.04:LTSlinux-aws-6.17no fix listedUBUNTU-CVE-2026-97562
Ubuntu:22.04:LTSlinux-aws-6.2no fix listedUBUNTU-CVE-2026-97562
Ubuntu:22.04:LTSlinux-aws-6.5no fix listedUBUNTU-CVE-2026-97562
Ubuntu:22.04:LTSlinux-aws-6.8no fix listedUBUNTU-CVE-2026-97562
Ubuntu:24.04:LTSlinux-aws-7.0no fix listedUBUNTU-CVE-2026-97562
Ubuntu:22.04:LTSlinux-azureno fix listedUBUNTU-CVE-2026-97562
Ubuntu:24.04:LTSlinux-azureno fix listedUBUNTU-CVE-2026-97562
Ubuntu:26.04:LTSlinux-azureno fix listedUBUNTU-CVE-2026-97562
Ubuntu:22.04:LTSlinux-azure-5.19no fix listedUBUNTU-CVE-2026-97562
Ubuntu:24.04:LTSlinux-azure-6.11no fix listedUBUNTU-CVE-2026-97562
Ubuntu:24.04:LTSlinux-azure-6.14no fix listedUBUNTU-CVE-2026-97562
Ubuntu:24.04:LTSlinux-azure-6.17no fix listedUBUNTU-CVE-2026-97562
Ubuntu:22.04:LTSlinux-azure-6.2no fix listedUBUNTU-CVE-2026-97562
Ubuntu:22.04:LTSlinux-azure-6.5no fix listedUBUNTU-CVE-2026-97562
Ubuntu:22.04:LTSlinux-azure-6.8no fix listedUBUNTU-CVE-2026-97562
Ubuntu:24.04:LTSlinux-azure-7.0no fix listedUBUNTU-CVE-2026-97562
Ubuntu:22.04:LTSlinux-azure-fdeno fix listedUBUNTU-CVE-2026-97562
Ubuntu:24.04:LTSlinux-azure-fdeno fix listedUBUNTU-CVE-2026-97562
Ubuntu:26.04:LTSlinux-azure-fdeno fix listedUBUNTU-CVE-2026-97562
Ubuntu:22.04:LTSlinux-azure-fde-5.19no fix listedUBUNTU-CVE-2026-97562
Ubuntu:24.04:LTSlinux-azure-fde-6.14no fix listedUBUNTU-CVE-2026-97562
Ubuntu:24.04:LTSlinux-azure-fde-6.17no fix listedUBUNTU-CVE-2026-97562
Ubuntu:22.04:LTSlinux-azure-fde-6.2no fix listedUBUNTU-CVE-2026-97562
Ubuntu:22.04:LTSlinux-azure-fde-6.8no fix listedUBUNTU-CVE-2026-97562
Ubuntu:24.04:LTSlinux-azure-fde-7.0no fix listedUBUNTU-CVE-2026-97562
Ubuntu:24.04:LTSlinux-azure-nvidiano fix listedUBUNTU-CVE-2026-97562
Ubuntu:24.04:LTSlinux-azure-nvidia-6.14no fix listedUBUNTU-CVE-2026-97562
Ubuntu:22.04:LTSlinux-gcpno fix listedUBUNTU-CVE-2026-97562
Ubuntu:24.04:LTSlinux-gcpno fix listedUBUNTU-CVE-2026-97562
Ubuntu:26.04:LTSlinux-gcp7.0.0-1016.18UBUNTU-CVE-2026-97562
Ubuntu:22.04:LTSlinux-gcp-5.19no fix listedUBUNTU-CVE-2026-97562
Ubuntu:24.04:LTSlinux-gcp-6.11no fix listedUBUNTU-CVE-2026-97562
Ubuntu:24.04:LTSlinux-gcp-6.14no fix listedUBUNTU-CVE-2026-97562
Ubuntu:24.04:LTSlinux-gcp-6.17no fix listedUBUNTU-CVE-2026-97562
Ubuntu:22.04:LTSlinux-gcp-6.2no fix listedUBUNTU-CVE-2026-97562
Ubuntu:22.04:LTSlinux-gcp-6.5no fix listedUBUNTU-CVE-2026-97562
Ubuntu:22.04:LTSlinux-gcp-6.8no fix listedUBUNTU-CVE-2026-97562
Ubuntu:24.04:LTSlinux-gcp-7.0no fix listedUBUNTU-CVE-2026-97562
Ubuntu:22.04:LTSlinux-gkeno fix listedUBUNTU-CVE-2026-97562
Ubuntu:24.04:LTSlinux-gkeno fix listedUBUNTU-CVE-2026-97562
Ubuntu:26.04:LTSlinux-gkeno fix listedUBUNTU-CVE-2026-97562
Ubuntu:22.04:LTSlinux-gkeopno fix listedUBUNTU-CVE-2026-97562
Ubuntu:24.04:LTSlinux-gkeopno fix listedUBUNTU-CVE-2026-97562
Ubuntu:22.04:LTSlinux-hwe-5.19no fix listedUBUNTU-CVE-2026-97562
Ubuntu:24.04:LTSlinux-hwe-6.11no fix listedUBUNTU-CVE-2026-97562
Ubuntu:24.04:LTSlinux-hwe-6.14no fix listedUBUNTU-CVE-2026-97562
Ubuntu:24.04:LTSlinux-hwe-6.17no fix listedUBUNTU-CVE-2026-97562
Ubuntu:22.04:LTSlinux-hwe-6.2no fix listedUBUNTU-CVE-2026-97562
Ubuntu:22.04:LTSlinux-hwe-6.5no fix listedUBUNTU-CVE-2026-97562
Ubuntu:22.04:LTSlinux-hwe-6.8no fix listedUBUNTU-CVE-2026-97562
Ubuntu:24.04:LTSlinux-hwe-7.07.0.0-42.42~24.04.1UBUNTU-CVE-2026-97562
Ubuntu:22.04:LTSlinux-ibmno fix listedUBUNTU-CVE-2026-97562
Ubuntu:24.04:LTSlinux-ibmno fix listedUBUNTU-CVE-2026-97562
Ubuntu:26.04:LTSlinux-ibm7.0.0-1017.17UBUNTU-CVE-2026-97562
Ubuntu:22.04:LTSlinux-ibm-6.8no fix listedUBUNTU-CVE-2026-97562
Ubuntu:22.04:LTSlinux-intel-iot-realtimeno fix listedUBUNTU-CVE-2026-97562
Ubuntu:22.04:LTSlinux-intel-iotgno fix listedUBUNTU-CVE-2026-97562
Ubuntu:22.04:LTSlinux-kvmno fix listedUBUNTU-CVE-2026-97562
Ubuntu:22.04:LTSlinux-lowlatencyno fix listedUBUNTU-CVE-2026-97562
Ubuntu:24.04:LTSlinux-lowlatencyno fix listedUBUNTU-CVE-2026-97562
Ubuntu:22.04:LTSlinux-lowlatency-hwe-5.19no fix listedUBUNTU-CVE-2026-97562
Ubuntu:24.04:LTSlinux-lowlatency-hwe-6.11no fix listedUBUNTU-CVE-2026-97562
Ubuntu:22.04:LTSlinux-lowlatency-hwe-6.2no fix listedUBUNTU-CVE-2026-97562
Ubuntu:22.04:LTSlinux-lowlatency-hwe-6.5no fix listedUBUNTU-CVE-2026-97562
Ubuntu:22.04:LTSlinux-lowlatency-hwe-6.8no fix listedUBUNTU-CVE-2026-97562
Ubuntu:22.04:LTSlinux-nvidiano fix listedUBUNTU-CVE-2026-97562
Ubuntu:24.04:LTSlinux-nvidiano fix listedUBUNTU-CVE-2026-97562
Ubuntu:26.04:LTSlinux-nvidiano fix listedUBUNTU-CVE-2026-97562
Ubuntu:24.04:LTSlinux-nvidia-6.11no fix listedUBUNTU-CVE-2026-97562
Ubuntu:24.04:LTSlinux-nvidia-6.17no fix listedUBUNTU-CVE-2026-97562
Ubuntu:22.04:LTSlinux-nvidia-6.2no fix listedUBUNTU-CVE-2026-97562
Ubuntu:22.04:LTSlinux-nvidia-6.5no fix listedUBUNTU-CVE-2026-97562
Ubuntu:22.04:LTSlinux-nvidia-6.8no fix listedUBUNTU-CVE-2026-97562
Ubuntu:24.04:LTSlinux-nvidia-7.0no fix listedUBUNTU-CVE-2026-97562
Ubuntu:26.04:LTSlinux-nvidia-bosno fix listedUBUNTU-CVE-2026-97562
Ubuntu:24.04:LTSlinux-nvidia-lowlatencyno fix listedUBUNTU-CVE-2026-97562
Ubuntu:22.04:LTSlinux-nvidia-tegrano fix listedUBUNTU-CVE-2026-97562
Ubuntu:24.04:LTSlinux-nvidia-tegrano fix listedUBUNTU-CVE-2026-97562
Ubuntu:22.04:LTSlinux-nvidia-tegra-igxno fix listedUBUNTU-CVE-2026-97562
Ubuntu:22.04:LTSlinux-oem-5.17no fix listedUBUNTU-CVE-2026-97562
Ubuntu:22.04:LTSlinux-oem-6.0no fix listedUBUNTU-CVE-2026-97562
Ubuntu:22.04:LTSlinux-oem-6.1no fix listedUBUNTU-CVE-2026-97562
Ubuntu:24.04:LTSlinux-oem-6.11no fix listedUBUNTU-CVE-2026-97562
Ubuntu:24.04:LTSlinux-oem-6.14no fix listedUBUNTU-CVE-2026-97562
Ubuntu:24.04:LTSlinux-oem-6.17no fix listedUBUNTU-CVE-2026-97562
Ubuntu:22.04:LTSlinux-oem-6.5no fix listedUBUNTU-CVE-2026-97562
Ubuntu:24.04:LTSlinux-oem-6.8no fix listedUBUNTU-CVE-2026-97562
Ubuntu:26.04:LTSlinux-oem-7.07.0.0-1017.17UBUNTU-CVE-2026-97562
Ubuntu:22.04:LTSlinux-oracleno fix listedUBUNTU-CVE-2026-97562
Ubuntu:24.04:LTSlinux-oracleno fix listedUBUNTU-CVE-2026-97562
Ubuntu:26.04:LTSlinux-oracle7.0.0-1015.16UBUNTU-CVE-2026-97562
Ubuntu:24.04:LTSlinux-oracle-6.14no fix listedUBUNTU-CVE-2026-97562
Ubuntu:24.04:LTSlinux-oracle-6.17no fix listedUBUNTU-CVE-2026-97562
Ubuntu:22.04:LTSlinux-oracle-6.5no fix listedUBUNTU-CVE-2026-97562
Ubuntu:22.04:LTSlinux-oracle-6.8no fix listedUBUNTU-CVE-2026-97562
Ubuntu:24.04:LTSlinux-oracle-7.0no fix listedUBUNTU-CVE-2026-97562
Ubuntu:22.04:LTSlinux-raspino fix listedUBUNTU-CVE-2026-97562
Ubuntu:24.04:LTSlinux-raspino fix listedUBUNTU-CVE-2026-97562
Ubuntu:26.04:LTSlinux-raspino fix listedUBUNTU-CVE-2026-97562
Ubuntu:24.04:LTSlinux-raspi-realtimeno fix listedUBUNTU-CVE-2026-97562
Ubuntu:22.04:LTSlinux-realtimeno fix listedUBUNTU-CVE-2026-97562
Ubuntu:24.04:LTSlinux-realtimeno fix listedUBUNTU-CVE-2026-97562
Ubuntu:26.04:LTSlinux-realtimeno fix listedUBUNTU-CVE-2026-97562
Ubuntu:22.04:LTSlinux-riscvno fix listedUBUNTU-CVE-2026-97562
Ubuntu:24.04:LTSlinux-riscvno fix listedUBUNTU-CVE-2026-97562
Ubuntu:26.04:LTSlinux-riscv7.0.0-42.42.1UBUNTU-CVE-2026-97562
Ubuntu:22.04:LTSlinux-riscv-5.19no fix listedUBUNTU-CVE-2026-97562
Ubuntu:24.04:LTSlinux-riscv-6.14no fix listedUBUNTU-CVE-2026-97562
Ubuntu:24.04:LTSlinux-riscv-6.17no fix listedUBUNTU-CVE-2026-97562
Ubuntu:22.04:LTSlinux-riscv-6.5no fix listedUBUNTU-CVE-2026-97562
Ubuntu:22.04:LTSlinux-riscv-6.8no fix listedUBUNTU-CVE-2026-97562
Ubuntu:24.04:LTSlinux-riscv-7.07.0.0-42.42.1~24.04.1UBUNTU-CVE-2026-97562
Ubuntu:22.04:LTSlinux-starfive-5.19no fix listedUBUNTU-CVE-2026-97562
Ubuntu:22.04:LTSlinux-starfive-6.2no fix listedUBUNTU-CVE-2026-97562
Ubuntu:22.04:LTSlinux-starfive-6.5no fix listedUBUNTU-CVE-2026-97562
Ubuntu:24.04:LTSlinux-vmwareno fix listedUBUNTU-CVE-2026-97562
Ubuntu:24.04:LTSlinux-xilinxno fix listedUBUNTU-CVE-2026-97562
Ubuntu:22.04:LTSlinux-xilinx-zynqmpno fix listedUBUNTU-CVE-2026-97562

Affected products (as reported)

VendorProductVersions
Linux Linux bacd704a95ad0b93af995aae4a523aa046f46563 – before 3c9acc9835c304013a4faeb969fe9333d66ca9f8bacd704a95ad0b93af995aae4a523aa046f46563 – before ea43a15cea36dc5ddd832be5bddeac7dd804cbcfbacd704a95ad0b93af995aae4a523aa046f46563 – before a6b6561522212af852c9ad8a7dca8d59ef2c7377bacd704a95ad0b93af995aae4a523aa046f46563 – before 5b01a8c0209690db75341528ec53fd87e0ac1460bacd704a95ad0b93af995aae4a523aa046f46563 – before d806d5a85dcbe2a0f181b2f0f9f61ddfbefa1818
Linux Linux 5.7

References