CVE-2020-36788

Description

In the Linux kernel, the following vulnerability has been resolved: drm/nouveau: avoid a use-after-free when BO init fails nouveau_bo_init() is backed by ttm_bo_init() and ferries its return code back to the caller. On failures, ttm_bo_init() invokes the provided destructor which should de-initialize and free the memory. Thus, when nouveau_bo_init() returns an error the gem object has already been released and the memory freed by nouveau_bo_del_ttm().

CVSS Metrics

• v3.1•HIGH•Score: 7.8CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS Trends

Current EPSS score: 0.02%• Percentile: 4%

Techniques & Countermeasures

• CWE-416•Use After Free

  The product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer.

Affected Systems

• linux•linux

  ≥ 019cbd4a4feb3aa3a917d78e7110e3011bbff6d5, < f86e19d918a85492ad1a01fcdc0ad5ecbdac6f96 | ≥ 019cbd4a4feb3aa3a917d78e7110e3011bbff6d5, < 548f2ff8ea5e0ce767ae3418d1ec5308990be87d | ≥ 019cbd4a4feb3aa3a917d78e7110e3011bbff6d5, < bcf34aa5082ee2343574bc3f4d1c126030913e54 | 5.4

• linux•linux_kernel

  ≥ 5.4, < 5.10.73 | ≥ 5.11, < 5.14.12 | 5.15:rc1 | 5.15:rc2 | 5.15:rc3 | 5.15:rc4

References (3)

• https://git.kernel.org/stable/c/f86e19d918a85492ad1a01fcdc0ad5ecbdac6f96
• https://git.kernel.org/stable/c/548f2ff8ea5e0ce767ae3418d1ec5308990be87d
• https://git.kernel.org/stable/c/bcf34aa5082ee2343574bc3f4d1c126030913e54