7.9

CVE-2023-0266

Warnung

Use after free in SNDRV_CTL_IOCTL_ELEM in Linux Kernel

A use after free vulnerability exists in the ALSA PCM package in the Linux Kernel. SNDRV_CTL_IOCTL_ELEM_{READ|WRITE}32 is missing locks that can be used in a use-after-free that can result in a priviledge escalation to gain ring0 access from the system user. We recommend upgrading past commit 56b88b50565cd8b946a2d00b0c83927b7ebb055e
Daten sind bereitgestellt durch National Vulnerability Database (NVD)
Debian ≫ Debian Linux Version10.0
Linux ≫ Linux Kernel Version >= 4.14 < 4.14.303
Linux ≫ Linux Kernel Version >= 4.15 < 4.19.270
Linux ≫ Linux Kernel Version >= 4.20 < 5.4.229
Linux ≫ Linux Kernel Version >= 5.5 < 5.10.163
Linux ≫ Linux Kernel Version >= 5.11 < 5.15.88
Linux ≫ Linux Kernel Version >= 5.16 < 6.1.6
VulnDex Vulnerability Enrichment
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30.03.2023: CISA Known Exploited Vulnerabilities (KEV) Catalog

Linux Kernel Use-After-Free Vulnerability

Schwachstelle

Linux kernel contains a use-after-free vulnerability that allows for privilege escalation to gain ring0 access from the system user.

Beschreibung

Apply updates per vendor instructions.

Erforderliche Maßnahmen
EPSS Metriken
Typ Quelle Score Percentile
EPSS FIRST.org 3.7% 0.883
CVSS Metriken
Quelle Base Score Exploit Score Impact Score Vector String
nvd@nist.gov 7 1 5.9
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
cve-coordination@google.com 7.9 1.3 6
CVSS:3.1/AV:A/AC:H/PR:L/UI:N/S:C/C:L/I:H/A:H
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 Any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer.

https://lists.debian.org/debian-lts-announce/2023/05/msg00006.html
Third Party Advisory
Mailing List
https://git.kernel.org/pub/scm/linux/kernel/git/stable/stable-queue.git/tree/queue-5.10/alsa-pcm-move-rwsem-lock-inside-snd_ctl_elem_read-to-prevent-uaf.patch?id=72783cf35e6c55bca84c4bb7b776c58152856fd4
Patch
Vendor Advisory
Mailing List
https://github.com/torvalds/linux/commit/56b88b50565cd8b946a2d00b0c83927b7ebb055e
Patch
https://github.com/torvalds/linux/commit/becf9e5d553c2389d857a3c178ce80fdb34a02e1
Patch
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2023-0266
US Government Resource