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CVE-2023-52486

Status Candidate

Overview

In the Linux kernel, the following vulnerability has been resolved: drm: Don't unref the same fb many times by mistake due to deadlock handling If we get a deadlock after the fb lookup in drm_mode_page_flip_ioctl() we proceed to unref the fb and then retry the whole thing from the top. But we forget to reset the fb pointer back to NULL, and so if we then get another error during the retry, before the fb lookup, we proceed the unref the same fb again without having gotten another reference. The end result is that the fb will (eventually) end up being freed while it's still in use. Reset fb to NULL once we've unreffed it to avoid doing it again until we've done another fb lookup. This turned out to be pretty easy to hit on a DG2 when doing async flips (and CONFIG_DEBUG_WW_MUTEX_SLOWPATH=y). The first symptom I saw that drm_closefb() simply got stuck in a busy loop while walking the framebuffer list. Fortunately I was able to convince it to oops instead, and from there it was easier to track down the culprit.

Related Files

Ubuntu Security Notice USN-6828-1
Posted Jun 12, 2024
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 6828-1 - Zheng Wang discovered that the Broadcom FullMAC WLAN driver in the Linux kernel contained a race condition during device removal, leading to a use- after-free vulnerability. A physically proximate attacker could possibly use this to cause a denial of service. It was discovered that the ATA over Ethernet driver in the Linux kernel contained a race condition, leading to a use-after-free vulnerability. An attacker could use this to cause a denial of service or possibly execute arbitrary code.

tags | advisory, denial of service, arbitrary, kernel
systems | linux, ubuntu
advisories | CVE-2022-0001, CVE-2023-47233, CVE-2023-52486, CVE-2023-52491, CVE-2023-52492, CVE-2023-52493, CVE-2023-52497, CVE-2023-52530, CVE-2023-52583, CVE-2023-52588, CVE-2023-52594, CVE-2023-52598, CVE-2023-52599, CVE-2023-52601
SHA-256 | 488517b61336dab3bc51a5c78cc3f59815f9cbaf86589ad479bd44ac1cb98921
Debian Security Advisory 5681-1
Posted May 8, 2024
Authored by Debian | Site debian.org

Debian Linux Security Advisory 5681-1 - Several vulnerabilities have been discovered in the Linux kernel that may lead to a privilege escalation, denial of service or information leaks.

tags | advisory, denial of service, kernel, vulnerability
systems | linux, debian
advisories | CVE-2023-28746, CVE-2023-47233, CVE-2023-52429, CVE-2023-52434, CVE-2023-52435, CVE-2023-52447, CVE-2023-52458, CVE-2023-52482, CVE-2023-52486, CVE-2023-52488, CVE-2023-52489, CVE-2023-52491, CVE-2023-52492, CVE-2023-52493
SHA-256 | 71181e4008b0c5637c5d9d6cac7f0dc2baec3a0e2ec38d19ae677421f521b4be
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