VulnerabilityModified
CVE-2023-1076
The tun/tap sockets have their socket UID hardcoded to 0 due to a type confusion in their initialization function.
MEDIUM 5.5EPSS 0.26%
Does this matter?
Lower severity and a low EPSS score (0.26%). Track it; it rarely justifies an emergency change on its own.
Description
A flaw was found in the Linux Kernel. The tun/tap sockets have their socket UID hardcoded to 0 due to a type confusion in their initialization function. While it will be often correct, as tuntap devices require CAP_NET_ADMIN, it may not always be the case, e.g., a non-root user only having that capability. This would make tun/tap sockets being incorrectly treated in filtering/routing decisions, possibly bypassing network filters.
- CVSS 3.1
- 5.5 MEDIUMCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N
- EPSS
- 0.26% probability · 17th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-791, CWE-843
- Affected
- linux/linux kernel
- Source
- secalert@redhat.com
References
- https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/commit/?id=66b2c338adce580dfce2199591e65e2bab889cffMailing List, Patch
- https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/commit/?id=a096ccca6e503a5c575717ff8a36ace27510ab0aMailing List, Patch
- https://lists.debian.org/debian-lts-announce/2023/05/msg00005.html
- https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/commit/?id=66b2c338adce580dfce2199591e65e2bab889cffMailing List, Patch
- https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/commit/?id=a096ccca6e503a5c575717ff8a36ace27510ab0aMailing List, Patch
- https://lists.debian.org/debian-lts-announce/2023/05/msg00005.html
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.