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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.
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Amazon_linux_2023 | — | Upgrade bpftool6.12Upgrade kernel6.12-modules-extraUpgrade kernel6.12-headersUpgrade kernel6.12Upgrade kernel6.12-debuginfo-common-aarch64Upgrade kernel6.12-modules-extra-commonUpgrade kernel-livepatch-6.12.111-136.204Upgrade perf6.12Upgrade kernel6.12-debuginfoUpgrade kernel6.12-develUpgrade kernel6.12-debuginfo-common-x86_64Upgrade perf6.12-debuginfoUpgrade bpftool6.12-debuginfoUpgrade kernel6.12-toolsUpgrade python3-perf6.12Upgrade python3-perf6.12-debuginfoUpgrade kernel6.12-tools-develUpgrade kernel6.12-tools-debuginfo | Oct 13, 2026 | Sep 25, 2026 |
| Debian | — | Upgrade linux-6.12Upgrade linux | Sep 30, 2026 | Sep 25, 2026 |
| Redhat_linux | — | No solution exists | Sep 30, 2026 | Sep 25, 2026 |
| Ubuntu | — | Upgrade linux-ibmUpgrade linux-hwe-7.0Upgrade linux-gcpUpgrade linux-oracleUpgrade linux-riscvUpgrade linux-awsUpgrade linux-riscv-7.0Upgrade linuxUpgrade linux-oem-7.0 | Nov 3, 2026 | Sep 25, 2026 |
| Vmware Photon_os | — | Use 'tdnf update' to upgrade all packages to the latest version. | Oct 13, 2026 | Sep 25, 2026 |
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