Description
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.
Metrics
CVSS 3.1 7.8/10
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:HAffected software
Source: the vendor's advisory (CNA). NVD analysis pending.
| Vendor | Product | Versions |
|---|---|---|
| Linux | Linux | >= 295cbf6d63165fe4253cf1d9ceadcda47a318b48, < 2f7730c03a9deea3ba7a1c980070d363b4ea2046; >= 295cbf6d63165fe4253cf1d9ceadcda47a318b48, < d20ee42f8226607b5693b2bc2f115ca2d270221a; >= 295cbf6d63165fe4253cf1d9ceadcda47a318b48, < 15ba8053fe4162c933855f1676fb321cdb6251c7; >= 295cbf6d63165fe4253cf1d9ceadcda47a318b48, < 3446ffb5d03c36f9ce88ede7ca5be319a2968d96; >= 295cbf6d63165fe4253cf1d9ceadcda47a318b48, < 87a56c1e8e36d06ebe8640432f911538ded7827d; >= 295cbf6d63165fe4253cf1d9ceadcda47a318b48, < 1caee6e084a96ada94658f261ced377d85af3f03; >= 295cbf6d63165fe4253cf1d9ceadcda47a318b48, < a1dd41d00c57efb1fbc6f361c5f48c9d00cca51c; >= 295cbf6d63165fe4253cf1d9ceadcda47a318b48, < 98e37db4a34d3af3fb2f4648295c25b5e40b20e3 |
| Linux | Linux | 2.6.23 |
References
- https://git.kernel.org/stable/c/15ba8053fe4162c933855f1676fb321cdb6251c7
- https://git.kernel.org/stable/c/1caee6e084a96ada94658f261ced377d85af3f03
- https://git.kernel.org/stable/c/2f7730c03a9deea3ba7a1c980070d363b4ea2046
- https://git.kernel.org/stable/c/3446ffb5d03c36f9ce88ede7ca5be319a2968d96
- https://git.kernel.org/stable/c/87a56c1e8e36d06ebe8640432f911538ded7827d
- https://git.kernel.org/stable/c/98e37db4a34d3af3fb2f4648295c25b5e40b20e3
- https://git.kernel.org/stable/c/a1dd41d00c57efb1fbc6f361c5f48c9d00cca51c
- https://git.kernel.org/stable/c/d20ee42f8226607b5693b2bc2f115ca2d270221a
Timeline
- Published
- Aug 15, 2026
- Last modified
- Aug 19, 2026
- NVD status
- Received