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CVE-2026-31586: Linux, грешка в паметта

7.8

CVSS 3.1

Няма данни

Вероятност да бъде експлоатирана в следващите 30 дни (EPSS)

Няма потвърждение

Атакува се

Няма данни

Време до експлоатация

Атакува се локално, без особени условия, с обикновен потребителски вход и без действие от потребителя.

CVE радар: още уязвимости от този вид

  • Експлоатация: няма данни за експлоатация
  • Атаката не може да се автоматизира

Описание

Оригинално описание

In the Linux kernel, the following vulnerability has been resolved: mm: blk-cgroup: fix use-after-free in cgwb_release_workfn() cgwb_release_workfn() calls css_put(wb->blkcg_css) and then later accesses wb->blkcg_css again via blkcg_unpin_online(). If css_put() drops the last reference, the blkcg can be freed asynchronously (css_free_rwork_fn -> blkcg_css_free -> kfree) before blkcg_unpin_online() dereferences the pointer to access blkcg->online_pin, resulting in a use-after-free: BUG: KASAN: slab-use-after-free in blkcg_unpin_online (./include/linux/instrumented.h:112 ./include/linux/atomic/atomic-instrumented.h:400 ./include/linux/refcount.h:389 ./include/linux/refcount.h:432 ./include/linux/refcount.h:450 block/blk-cgroup.c:1367) Write of size 4 at addr ff11000117aa6160 by task kworker/71:1/531 Workqueue: cgwb_release cgwb_release_workfn Call Trace: <TASK> blkcg_unpin_online (./include/linux/instrumented.h:112 ./include/linux/atomic/atomic-instrumented.h:400 ./include/linux/refcount.h:389 ./include/linux/refcount.h:432 ./include/linux/refcount.h:450 block/blk-cgroup.c:1367) cgwb_release_workfn (mm/backing-dev.c:629) process_scheduled_works (kernel/workqueue.c:3278 kernel/workqueue.c:3385) Freed by task 1016: kfree (./include/linux/kasan.h:235 mm/slub.c:2689 mm/slub.c:6246 mm/slub.c:6561) css_free_rwork_fn (kernel/cgroup/cgroup.c:5542) process_scheduled_works (kernel/workqueue.c:3302 kernel/workqueue.c:3385) ** Stack based on commit 66672af7a095 ("Add linux-next specific files for 20260410") I am seeing this crash sporadically in Meta fleet across multiple kernel versions. A full reproducer is available at: https://github.com/leitao/debug/blob/main/reproducers/repro_blkcg_uaf.sh (The race window is narrow. To make it easily reproducible, inject a msleep(100) between css_put() and blkcg_unpin_online() in cgwb_release_workfn(). With that delay and a KASAN-enabled kernel, the reproducer triggers the splat reliabl

Засегнати продукти

  • Linux Linux: 59b57717fff8b562825d9d25e0180ad7e8048ca9 преди 23acef4156c260e8598397a1a2e8b3a23e919893; 59b57717fff8b562825d9d25e0180ad7e8048ca9 преди 1bd36e93b542d9dd020190c6607c6a3663405195; 59b57717fff8b562825d9d25e0180ad7e8048ca9 преди 740ba1ebb223f137ff088ab74d533a13f9167bd8; 59b57717fff8b562825d9d25e0180ad7e8048ca9 преди 115a5266749dcde7fe4127e8623d19c752088f69; 59b57717fff8b562825d9d25e0180ad7e8048ca9 преди dfc8292a1d6782c76b626315605e0585a5a18447; 59b57717fff8b562825d9d25e0180ad7e8048ca9 преди ea3af09eb87d8f8708c66747fcf1a2762902e839; 59b57717fff8b562825d9d25e0180ad7e8048ca9 преди 50879a3c1faf06e661090015d59e2127255cff27; 59b57717fff8b562825d9d25e0180ad7e8048ca9 преди 67cb119d32f35e32acd0393bbeb318b2bb1fdafe; 59b57717fff8b562825d9d25e0180ad7e8048ca9 преди 8f5857be99f1ed1fa80991c72449541f634626ee
  • Linux Linux: 4.19; преди 4.19; 5.10.258 до 5.10.*; 5.15.209 до 5.15.*; 6.1.175 до 6.1.*; 6.6.136 до 6.6.*; 6.12.83 до 6.12.*; 6.18.24 до 6.18.*; 6.19.14 до 6.19.*; 7.0.1 до 7.0.*; от 7.1 нататък
  • Siemens SIMATIC S7-1500 TM MFP - GNU/Linux subsystem: всички версии

Вид слабост

История

  • 24 април 2026 Публикувано

Други уязвимости в Linux Linux

Първоизточници

CVE-2026-31586: Linux, грешка в паметта | freedomonline.bg