CVE-2026-72181

Summary

In the Linux kernel, the following vulnerability has been resolved:

mips: sched: Fix CPUMASK_OFFSTACK memory corruption

This patch addresses a critical memory management flaw. When CONFIG_CPUMASK_OFFSTACK is enabled, cpumask_var_t is a pointer. Consequently, sizeof(new_mask) evaluates to the pointer size, causing copy_from_user() to clobber the mask pointer. Furthermore, the old logic performed copy_from_user() before allocating the mask.

Fix this by allocating new_mask first. To handle variable-sized user masks correctly, use cpumask_size() to truncate overly large user masks or pad undersized masks with zeros before copying the data directly into the allocated buffer.

Affected Software

VendorProductVersion RangeStatus
LinuxLinux295cbf6d63165fe4253cf1d9ceadcda47a318b48 < d20ee42f8226607b5693b2bc2f115ca2d270221aaffected
LinuxLinux295cbf6d63165fe4253cf1d9ceadcda47a318b48 < 15ba8053fe4162c933855f1676fb321cdb6251c7affected
LinuxLinux295cbf6d63165fe4253cf1d9ceadcda47a318b48 < 3446ffb5d03c36f9ce88ede7ca5be319a2968d96affected
LinuxLinux295cbf6d63165fe4253cf1d9ceadcda47a318b48 < 87a56c1e8e36d06ebe8640432f911538ded7827daffected
LinuxLinux295cbf6d63165fe4253cf1d9ceadcda47a318b48 < 1caee6e084a96ada94658f261ced377d85af3f03affected
LinuxLinux295cbf6d63165fe4253cf1d9ceadcda47a318b48 < a1dd41d00c57efb1fbc6f361c5f48c9d00cca51caffected
LinuxLinux295cbf6d63165fe4253cf1d9ceadcda47a318b48 < 98e37db4a34d3af3fb2f4648295c25b5e40b20e3affected
LinuxLinux2.6.23affected
LinuxLinux0 < 2.6.23unaffected
LinuxLinux5.15.212 <= 5.15.*unaffected
LinuxLinux6.1.178 <= 6.1.*unaffected
LinuxLinux6.6.145 <= 6.6.*unaffected
LinuxLinux6.12.97 <= 6.12.*unaffected
LinuxLinux6.18.40 <= 6.18.*unaffected
LinuxLinux7.1.5 <= 7.1.*unaffected
LinuxLinux7.2 <= *unaffected

Weaknesses

References