Use-after-free in Linux kernel - CVE-2023-45898

Vulnerability identifier: #VU82689

CSH Severity: Low

CVSS v4: 8.5 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]

CVE-ID: CVE-2023-45898

CWE-ID: CWE-416

Exploitation vector: Local access

Exploit availability: No public exploit available

The vulnerability allows a local user to escalate privileges on the system.

The vulnerability exists due to a use-after-free error in fs/ext4/extents_status.c. A local user can trigger a use-after-free error and execute arbitrary code with elevated privileges.

Linux kernel
Ubuntu
SIMATIC S7-1500 TM MFP
linux-image-6.5.0-14-generic (Ubuntu package)
linux-image-6.5.0-14-generic-64k (Ubuntu package)
linux-image-6.5.0-14-lowlatency (Ubuntu package)
linux-image-6.5.0-14-lowlatency-64k (Ubuntu package)
linux-image-lowlatency (Ubuntu package)
linux-image-lowlatency-64k (Ubuntu package)
linux-image-kvm (Ubuntu package)
linux-image-generic-lpae (Ubuntu package)
linux-image-generic-64k (Ubuntu package)
linux-image-generic (Ubuntu package)
linux-image-virtual (Ubuntu package)
linux-image-6.5.0-1005-starfive (Ubuntu package)
linux-image-starfive (Ubuntu package)
linux-image-6.5.0-1007-laptop (Ubuntu package)
linux-image-laptop-23.10 (Ubuntu package)
linux-image-raspi (Ubuntu package)
linux-image-raspi-nolpae (Ubuntu package)
linux-image-6.5.0-1008-raspi (Ubuntu package)
linux-image-6.5.0-1009-azure-fde (Ubuntu package)
linux-image-6.5.0-1009-azure (Ubuntu package)
linux-image-6.5.0-1009-oem (Ubuntu package)
linux-image-azure-fde (Ubuntu package)
linux-image-azure (Ubuntu package)
linux-image-oem-22.04d (Ubuntu package)
linux-image-gcp (Ubuntu package)
linux-image-6.5.0-1010-azure (Ubuntu package)
linux-image-6.5.0-1010-azure-fde (Ubuntu package)
linux-image-6.5.0-1010-gcp (Ubuntu package)
linux-image-aws (Ubuntu package)
linux-image-6.5.0-1011-aws (Ubuntu package)
linux-image-oracle (Ubuntu package)
linux-image-6.5.0-1013-oracle (Ubuntu package)

Install updates from vendor's website.

Linux kernel - update to 6.5.4
linux-image-6.5.0-14-generic (Ubuntu package) - update to 6.5.0-14.14
linux-image-6.5.0-14-generic-64k (Ubuntu package) - update to 6.5.0-14.14
linux-image-6.5.0-14-lowlatency (Ubuntu package) - update to 6.5.0-14.14.1
linux-image-6.5.0-14-lowlatency-64k (Ubuntu package) - update to 6.5.0-14.14.1
linux-image-lowlatency (Ubuntu package) - update to 6.5.0.14.14.12
linux-image-lowlatency-64k (Ubuntu package) - update to 6.5.0.14.14.12
linux-image-kvm (Ubuntu package) - update to 6.5.0.14.16
linux-image-generic-lpae (Ubuntu package) - update to 6.5.0.14.16
linux-image-generic-64k (Ubuntu package) - update to 6.5.0.14.16
linux-image-generic (Ubuntu package) - update to 6.5.0.14.16
linux-image-virtual (Ubuntu package) - update to 6.5.0.14.16
linux-image-6.5.0-1005-starfive (Ubuntu package) - update to 6.5.0-1005.6
linux-image-starfive (Ubuntu package) - update to 6.5.0.1005.7
linux-image-6.5.0-1007-laptop (Ubuntu package) - update to 6.5.0-1007.10
linux-image-laptop-23.10 (Ubuntu package) - update to 6.5.0.1007.10
linux-image-raspi (Ubuntu package) - update to 6.5.0.1008.9
linux-image-raspi-nolpae (Ubuntu package) - update to 6.5.0.1008.9
linux-image-6.5.0-1008-raspi (Ubuntu package) - update to 6.5.0-1008.11
linux-image-6.5.0-1009-azure-fde (Ubuntu package) - update to 6.5.0-1009.9
linux-image-6.5.0-1009-azure (Ubuntu package) - update to 6.5.0-1009.9
linux-image-6.5.0-1009-oem (Ubuntu package) - update to 6.5.0-1009.10
linux-image-azure-fde (Ubuntu package) - addressed in versions 6.5.0.1009.11, 6.5.0.1010.12
linux-image-azure (Ubuntu package) - addressed in versions 6.5.0.1009.11, 6.5.0.1010.12
linux-image-oem-22.04d (Ubuntu package) - update to 6.5.0.1009.11
linux-image-gcp (Ubuntu package) - update to 6.5.0.1010.10
linux-image-6.5.0-1010-azure (Ubuntu package) - update to 6.5.0-1010.10
linux-image-6.5.0-1010-azure-fde (Ubuntu package) - update to 6.5.0-1010.10
linux-image-6.5.0-1010-gcp (Ubuntu package) - update to 6.5.0-1010.10
linux-image-aws (Ubuntu package) - update to 6.5.0.1011.11
linux-image-6.5.0-1011-aws (Ubuntu package) - update to 6.5.0-1011.11
linux-image-oracle (Ubuntu package) - update to 6.5.0.1013.13
linux-image-6.5.0-1013-oracle (Ubuntu package) - update to 6.5.0-1013.13

• https://github.com/torvalds/linux/commit/768d612f79822d30a1e7d132a4d4b05337ce42ec
• https://lore.kernel.org/lkml/aa03f191-445c-0d2e-d6d7-0a3208d7df7a@huawei.com/T/
• https://www.spinics.net/lists/stable-commits/msg317086.html
• https://lkml.org/lkml/2023/8/13/477
• https://cdn.kernel.org/pub/linux/kernel/v6.x/ChangeLog-6.5.4

• Privilege escalation in Linux kernel ext4
• Ubuntu update for linux-gcp
• Ubuntu update for linux
• Ubuntu update for linux-azure
• Multiple vulnerabilities in the Siemens SIMATIC S7-1500 TM MFP