CVE-2026-64017

Katalog CVE

CVSS 7.8 · High EPSS 0,13%

Kerentanan Use After Free pada linux kernel. Skor CVSS 3.1 7.8 (High) menurut CNA.

Deskripsi (NVD)

In the Linux kernel, the following vulnerability has been resolved: blk-mq: pop cached request if it is usable When submitting a bio to blk-mq, if the task should sleep after peeking a cached request, but before it pops it, the plug flushes and calls blk_mq_free_plug_rqs, freeing the cached_rqs. This creates a use-after-free bug. Fix this by popping the cached request before any possible blocking calls if it is suitable for use. Popping this request first holds a queue reference, so avoid any serialization races with queue freezes and can safely proceed with dispatching that request to the driver. This potentially increases a timing window from when a driver wants to freeze its queue to when requests stop being dispatched. That scenario is off the fast path though, and drivers need to appropriately handle requests during a freeze request anyway. The downside is the popped element needs to be individually freed when we performed a bio plug merge. The cached request would have had to be freed later anyway, but this patch does it inline with building the plug list instead of after flushing it.

Rincian

Terbit di NVD

19 Juli 2026

Terakhir diubah

13 Oktober 2026

Status NVD

Analyzed

CVSS 3.1

7.8 (High), sumber CNA
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H · uraikan di kalkulator

Jenis kelemahan (CWE)

CWE-416: Use After Free

EPSS (30 hari)

0,13% peluang dieksploitasi; lebih tinggi dari 1,9% CVE lain

Produk dan versi terdampak

> Data dari konfigurasi CPE di NVD.

Referensi dan perbaikan

• https://git.kernel.org/stable/c/23d8ea1e303b5f32d883757a4a707e791dbc9808 patch
• https://git.kernel.org/stable/c/388468f7e7d1eab092cf2a39fdfb502e52019ec6 patch
• https://git.kernel.org/stable/c/97e2d08de282ef76f84ab4ccd00f1acb3f5f999e patch
• https://git.kernel.org/stable/c/dc278e9bf2b9513a763353e6b9cc21e0f532954e patch