CVE-2026-31457: Linux

Описание

Оригинално описание

In the Linux kernel, the following vulnerability has been resolved: mm/damon/sysfs: check contexts->nr in repeat_call_fn damon_sysfs_repeat_call_fn() calls damon_sysfs_upd_tuned_intervals(), damon_sysfs_upd_schemes_stats(), and damon_sysfs_upd_schemes_effective_quotas() without checking contexts->nr. If nr_contexts is set to 0 via sysfs while DAMON is running, these functions dereference contexts_arr[0] and cause a NULL pointer dereference. Add the missing check. For example, the issue can be reproduced using DAMON sysfs interface and DAMON user-space tool (damo) [1] like below. $ sudo damo start --refresh_interval 1s $ echo 0 | sudo tee \ /sys/kernel/mm/damon/admin/kdamonds/0/contexts/nr_contexts

Засегнати продукти

• Linux Linux: d809a7c64ba8229286b333c0cba03b1cdfb50238 преди 3527e9fdc38570cea0f6ddb7a2c9303d4044b217; d809a7c64ba8229286b333c0cba03b1cdfb50238 преди 652cd0641a763dd0e846b0d12814977fadb2b7d8; d809a7c64ba8229286b333c0cba03b1cdfb50238 преди 6557004a8b59c7701e695f02be03c7e20ed1cc15
• Linux Linux: 6.17; преди 6.17; 6.18.21 до 6.18.*; 6.19.11 до 6.19.*; 7.0 до *

История

Други уязвимости в Linux Linux

• 8.1CVE-2026-99270
• 7.8CVE-2026-99269
• CVE-2026-99268
• CVE-2026-99266
• CVE-2026-99267

Първоизточници

• https://www.cve.org/CVERecord?id=CVE-2026-31457
• https://nvd.nist.gov/vuln/detail/CVE-2026-31457
• https://git.kernel.org/stable/c/3527e9fdc38570cea0f6ddb7a2c9303d4044b217
• https://git.kernel.org/stable/c/652cd0641a763dd0e846b0d12814977fadb2b7d8
• https://git.kernel.org/stable/c/6557004a8b59c7701e695f02be03c7e20ed1cc15