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CVE-2026-68377: 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: net/sched: act_tunnel_key: Defer dst_release to RCU callback Fix a race-condition use-after-free in tunnel_key_release_params(). The function releases the metadata_dst of the old params synchronously via dst_release() while deferring the params struct free with kfree_rcu(). A concurrent tunnel_key_act() reader on the datapath may still hold the old params pointer (under rcu_read_lock_bh) and proceed to call dst_clone(&params->tcft_enc_metadata->dst) after the writer's dst_release has already pushed the dst's rcuref to RCUREF_DEAD. [email protected] produced a poc which i (and Victor) verified that KASAN reports: ================================================================== BUG: KASAN: slab-use-after-free in instrument_atomic_read_write include/linux/instrumented.h:112 BUG: KASAN: slab-use-after-free in atomic_sub_return_release include/linux/atomic/atomic-instrumented.h:326 BUG: KASAN: slab-use-after-free in __rcuref_put include/linux/rcuref.h:109 BUG: KASAN: slab-use-after-free in rcuref_put include/linux/rcuref.h:173 BUG: KASAN: slab-use-after-free in dst_release+0x5b/0x370 net/core/dst.c:168 Write of size 4 at addr ffff88806158de40 by task poc/9388 CPU: 0 UID: 0 PID: 9388 Comm: poc Tainted: G W 7.1.0-rc7 #7 PREEMPT(lazy) Tainted: [W]=WARN Hardware name: QEMU Ubuntu 25.10 PC v2 (i440FX + PIIX, + 10.1 machine, 1996), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 Call Trace: <TASK> __dump_stack lib/dump_stack.c:94 dump_stack_lvl+0x100/0x190 lib/dump_stack.c:120 print_address_description mm/kasan/report.c:378 print_report+0x139/0x4ad mm/kasan/report.c:482 kasan_report+0xe4/0x1d0 mm/kasan/report.c:595 check_region_inline mm/kasan/generic.c:186 kasan_check_range+0x125/0x200 mm/kasan/generic.c:200 instrument_atomic_read_write include/linux/instrumented.h:112 atomic_sub_return_release include/linux/atomic/atomic-instrumented.h:326 __rcuref_put include/linux/rc

Засегнати продукти

  • Linux Linux: 9174c3df1cd181c14913138d50ccbe539bb08335 преди b5931f020b681fdcb9378262d89b61cb3c7ebbf8; 9174c3df1cd181c14913138d50ccbe539bb08335 преди 389d03992dabb80488228e8119b9dd6d0f58e1a6; 9174c3df1cd181c14913138d50ccbe539bb08335 преди 676ad6aa7cec89a08d2a5ce3cd5959e313f29733; 9174c3df1cd181c14913138d50ccbe539bb08335 преди 531dbb5bb98e52ad26be7e90f9f8bec707c5bd0e; 9174c3df1cd181c14913138d50ccbe539bb08335 преди 2200a00ff247f70f5dcdb4e6f14b0d48ddac5467; 9174c3df1cd181c14913138d50ccbe539bb08335 преди fed1b1ddab41a0e7a462ac690a0c8af6ff793624; 9174c3df1cd181c14913138d50ccbe539bb08335 преди 2791a501da508b704a617b4dba29db54a65bc9f7; 9174c3df1cd181c14913138d50ccbe539bb08335 преди f1f5c8a3955f8fda3f84ed883ac8daa1847e724c; 02239e797ac75f89a05622a27d04695f08c1ca89; ca9b7a65a2c97579fcdd509d454d48e3a5c49af8; 4.19.19 преди 4.20; 4.20.6 преди 4.21
  • Linux Linux: 5.0; преди 5.0; 5.10.265 до 5.10.*; 5.15.216 до 5.15.*; 6.1.183 до 6.1.*; 6.6.148 до 6.6.*; 6.12.101 до 6.12.*; 6.18.42 до 6.18.*; 7.1.6 до 7.1.*; от 7.2 нататък

Вид слабост

История

  • 10 август 2026 Публикувано

Други уязвимости в Linux Linux

Първоизточници

CVE-2026-68377: Linux, грешка в паметта | freedomonline.bg