Към съдържанието
Търсене

CVE-2026-63809: 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: bpf: use kvfree() for replaced sysctl write buffer proc_sys_call_handler() allocates its temporary sysctl buffer with kvzalloc() and passes it to __cgroup_bpf_run_filter_sysctl(). Since kvzalloc() may fall back to vmalloc() for large allocations, freeing that buffer with kfree() is wrong and can corrupt memory. Use kvfree() to safely handle both kmalloc and kvzalloc()/vmalloc allocations. The bug was first flagged by an experimental analysis tool we are developing for kernel memory-management bugs while analyzing v6.13-rc1. The tool is still under development and is not yet publicly available. Manual inspection confirms that the bug is still present in v7.1-rc5. Reproduced the bug based on v7.1-rc4 in a QEMU x86_64 guest booted with KASAN and CONFIG_FAILSLAB enabled. To exercise the replacement path, the test tree also included the accompanying fix for the stale ret == 1 check in __cgroup_bpf_run_filter_sysctl(). The reproducer confines failslab injections to the proc_sys_call_handler() range, uses stacktrace-depth=32, and injects fail-nth=1 while writing 8191 bytes to /proc/sys/kernel/domainname from a task in the target cgroup. Under that setup, fail-nth=1 triggered the fault: BUG: unable to handle page fault for address: ffffeb0200024d48 #PF: supervisor read access in kernel mode #PF: error_code(0x0000) - not-present page PGD 0 P4D 0 Oops: Oops: 0000 SMP KASAN NOPTI CPU: 2 UID: 0 PID: 209 Comm: repro_proc_sys_ Not tainted 7.1.0-rc4-00686-g97625979a5d4 PREEMPT(lazy) Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.15.0-1 04/01/2014 RIP: 0010:kfree+0x6e/0x510 ... Call Trace: <TASK> ? __cgroup_bpf_run_filter_sysctl+0x626/0xc30 __cgroup_bpf_run_filter_sysctl+0x74d/0xc30 ? __pfx___cgroup_bpf_run_filter_sysctl+0x10/0x10 ? srso_return_thunk+0x5/0x5f ? __kvmalloc_node_noprof+0x345/0x870 ? proc_sys_call_handler+0x250/0x480 ? srso_return_thunk+0

Засегнати продукти

  • Linux Linux: b7925acd82926ebbf94a0f0783a3961f4e558856 преди d0a81ed5ff5d0f9c3f63a4f9e5a4642c363ecd3e; 4508943794efdd94171549c0bd52810e2f4ad9fe преди 77355ef7a9f6b0d2bdf65be3b37f2c1f365e20d2; 4508943794efdd94171549c0bd52810e2f4ad9fe преди e1d1e203a6000804c5d3b8a4aa4e52303c0c7ab2; 4508943794efdd94171549c0bd52810e2f4ad9fe преди 81fc9a13acae99966232f0e055eb2e445263b89a; 4508943794efdd94171549c0bd52810e2f4ad9fe преди 838fe9c28121777c59a9406710a68fcf77bb8017; 4508943794efdd94171549c0bd52810e2f4ad9fe преди 65bd0c0afb0e1bf3287458e342429b069624f7d4; 4508943794efdd94171549c0bd52810e2f4ad9fe преди 70df4de46577fab5e25418f014583155a147c902; 4508943794efdd94171549c0bd52810e2f4ad9fe преди 4c21b5927d4364bfe7365f2700da5fea0ed0d004; 66258ab303588936ee1ee0794d9a271be24f73cb; 5.10.20 преди 5.10.260; 5.11.3 преди 5.12
  • Linux Linux: 5.12; преди 5.12; 5.10.260 до 5.10.*; 5.15.211 до 5.15.*; 6.1.177 до 6.1.*; 6.6.144 до 6.6.*; 6.12.95 до 6.12.*; 6.18.38 до 6.18.*; 7.1.3 до 7.1.*; от 7.2 нататък

Вид слабост

История

  • 19 юли 2026 Публикувано

Други уязвимости в Linux Linux

Първоизточници

CVE-2026-63809: Linux, грешка в паметта | freedomonline.bg