SB2023112388 - Red Hat Enterprise Linux 9.0 Extended Update Support update for kernel-rt
Published: November 23, 2023 Updated: January 10, 2025
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 7 secuirty vulnerabilities.
1) Use-after-free (CVE-ID: CVE-2023-3776)
The vulnerability allows a local user to escalate privileges on the system.
The vulnerability exists due to a use-after-free error within the the Linux kernel's net/sched: cls_fw component. A local user can trigger a use-after-free error and execute arbitrary code with elevated privileges.
2) Out-of-bounds write (CVE-ID: CVE-2023-3812)
The vulnerability allows a local user to escalate privileges on the system.
The vulnerability exists due to a boundary error within the TUN/TAP device driver in Linux kernel. A local user can trigger an out-of-bounds write and execute arbitrary code with elevated privileges.
3) Use-after-free (CVE-ID: CVE-2023-4004)
The vulnerability allows a local user to escalate privileges on the system.
The vulnerability exists due to a use-after-free error in the way a user triggers the nft_pipapo_remove function with the element, without a NFT_SET_EXT_KEY_END. A local user can execute arbitrary code with elevated privileges.
4) Use-after-free (CVE-ID: CVE-2023-4147)
The vulnerability allows a local user to escalate privileges on the system.
The vulnerability exists due to a use-after-free error in Netfilter functionality when adding a rule with NFTA_RULE_CHAIN_ID. A local user can trigger a use-after-free error and execute arbitrary code with elevated privileges.
5) Out-of-bounds write (CVE-ID: CVE-2023-42753)
The vulnerability allows a local user to escalate privileges on the system.
The vulnerability exists due to a boundary error in the netfilter subsystem in Linux kernel. A local user can trigger an out-of-bounds write and execute arbitrary code with elevated privileges.
6) Use-after-free (CVE-ID: CVE-2023-0590)
The vulnerability allows a local user to perform a denial of service (DoS) attack.
The vulnerability exists due to a use-after-free error within the qdisc_graft() function in net/sched/sch_api.c. A local user can trigger a use-after-free error and crash the kernel.
7) Use-after-free (CVE-ID: CVE-2023-20593)
The vulnerability allows a local user to escalate privileges on the system.
The vulnerability exists due to a use-after-free error in AMD Zen2 processors. A local user can trigger a use-after-free error and execute arbitrary code on the system.
Note, the vulnerability was dubbed Zenbleed.
Remediation
Install update from vendor's website.