What’s Vulnerable › Vulnerabilities

CVE-2026-46093: mm/vmalloc: take vmap_purge_lock in shrinker

• Severity: high (CVSS 7.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.1% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-05-27 · updated 2026-07-18

Description

In the Linux kernel, the following vulnerability has been resolved: mm/vmalloc: take vmap_purge_lock in shrinker decay_va_pool_node() can be invoked concurrently from two paths: __purge_vmap_area_lazy() when pools are being purged, and the shrinker via vmap_node_shrink_scan(). However, decay_va_pool_node() is not safe to run concurrently, and the shrinker path currently lacks serialization, leading to races and possible leaks. Protect decay_va_pool_node() by taking vmap_purge_lock in the shrinker path to ensure serialization with purge users.

Affected products

• Linux kernel: from 6.9 before 6.18.27; from 6.19 before 7.0.4 — fixed in 6.18.27, 7.0.4

How to fix

Upgrade to a fixed version: Linux kernel 6.18.27, 7.0.4. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/12f2341b4c235d5593a433abac201c1c6725787f
• https://git.kernel.org/stable/c/687ccdf582169cd680aeaf24cc953807c4cd4345
• https://git.kernel.org/stable/c/c15ff206ba78820bf2873d0c668a882e99f4b631
• https://git.kernel.org/stable/c/ec05f51f1e65bce95528543eb73fda56fd201d94

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