NULL pointer dereference in Linux kernel jfs

1) NULL pointer dereference

EUVDB-ID: #VU93053

Risk: Low

CVSSv4.0: 4.3 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2021-47340

CWE-ID: CWE-476 - NULL Pointer Dereference

Exploit availability: No

Description

The vulnerability allows a local user to perform a denial of service (DoS) attack.

The vulnerability exists due to NULL pointer dereference within the jfs_evict_inode() function in fs/jfs/inode.c. A local user can perform a denial of service (DoS) attack.

Mitigation

Install update from vendor's website.

Vulnerable software versions

Linux kernel: 4.4 - 5.14 rc7

CPE2.3

• cpe:2.3:o:linux_foundation:linux_kernel:4.4:*:*:*:*:*:*:*
• cpe:2.3:o:linux_foundation:linux_kernel:4.4.0:*:*:*:*:*:*:*
• cpe:2.3:o:linux_foundation:linux_kernel:4.4.0-57:*:*:*:*:*:*:*
• cpe:2.3:o:linux_foundation:linux_kernel:4.4.1:*:*:*:*:*:*:*
• cpe:2.3:o:linux_foundation:linux_kernel:4.4.2:*:*:*:*:*:*:*
• cpe:2.3:o:linux_foundation:linux_kernel:4.4.3:*:*:*:*:*:*:*
• cpe:2.3:o:linux_foundation:linux_kernel:4.4.4:*:*:*:*:*:*:*
• cpe:2.3:o:linux_foundation:linux_kernel:4.4.5:*:*:*:*:*:*:*
• cpe:2.3:o:linux_foundation:linux_kernel:4.4.6:*:*:*:*:*:*:*
• cpe:2.3:o:linux_foundation:linux_kernel:4.4.7:*:*:*:*:*:*:*

External links

https://git.kernel.org/stable/c/7bde24bde490f3139eee147efc6d60d6040fe975
https://git.kernel.org/stable/c/745c9a59422c63f661f4374ed5181740db4130a1
https://git.kernel.org/stable/c/49def1b0644892e3b113673c13d650c3060b43bc
https://git.kernel.org/stable/c/aff8d95b69051d0cf4acc3d91f22299fdbb9dfb3
https://git.kernel.org/stable/c/a21e5cb1a64c904f1f0ef7b2d386fc7d2b1d2ce2
https://git.kernel.org/stable/c/8018936950360f1c503bb385e158cfc5e4945d18
https://git.kernel.org/stable/c/3bb27e27240289b47d3466f647a55c567adbdc3a
https://git.kernel.org/stable/c/42f102ea1943ecb10a0756bf75424de5d1d5beed
https://git.kernel.org/stable/c/9d574f985fe33efd6911f4d752de6f485a1ea732
https://mirrors.edge.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.14.240
https://mirrors.edge.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.19.198
https://mirrors.edge.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.4.276
https://mirrors.edge.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.9.276
https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.10.51
https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.12.18
https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.13.3
https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.14
https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.4.133

Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.