PT-2024-8986 · Linux+3 · Linux Kernel+3

Greg Kroah-Hartman + 1 · Published 2024-05-24 · Updated 2025-01-06 · CVE-2021-47562

Positive Technologies (AI Summary)

CVSS v3.1

5.5

Medium

Base vector

AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Name of the Vulnerable Software and Affected Versions: Linux kernel versions prior to 5.15.0-rc5+

Description: The vulnerability is related to a NULL pointer dereference in the Linux kernel, specifically in the ice driver. The issue occurs when the Rx queue count differs from the Tx queue count, causing a hidden bug to be exposed. The vulnerability can be triggered when ethtool -L is used and XDP rings are configured. The estimated number of potentially affected devices is not specified. There is no information about real-world incidents where this issue was exploited.

Technical details about exploitation include:

• The ice vsi free arrays() function is vulnerable.
• The ice vsi rebuild() function is also affected.
• The devres remove() function is involved in the NULL pointer dereference.
• The ethtool -L command can trigger the vulnerability when XDP rings are configured.

Recommendations: To resolve the issue, update the Linux kernel to a version that includes the fix for the ice driver, taking into account the value that num possible cpus() yields in addition to vsi->alloc txq instead of doubling the latter. At the moment, there is no information about a newer version that contains a fix for this vulnerability.

Exploit

NULL Pointer Dereference

Weakness Enumeration

CWE-476

Related Identifiers

BDU:2024-10668

CVE-2021-47562

OPENSUSE-SU-2024_2185-1

OPENSUSE-SU-2024_2189-1

SUSE-SU-2024:2008-1

SUSE-SU-2024:2010-1

SUSE-SU-2024:2011-1

SUSE-SU-2024:2019-1

SUSE-SU-2024:2183-1

SUSE-SU-2024:2185-1

SUSE-SU-2024:2189-1

SUSE-SU-2024:2190-1

Affected Products

Astra Linux

Linux Kernel

Red Os

Suse

References · 1433

• 🔥 https://github.com/lanleft/CVE-2023-1829 · Exploit
• https://nvd.nist.gov/vuln/detail/CVE-2021-47562 · Security Note
• https://cve.org/CVERecord?id=CVE-2021-47562 · Security Note
• https://osv.dev/vulnerability/CVE-2021-47562 · Vendor Advisory
• https://bdu.fstec.ru/vul/2024-10668 · Security Note
• https://git.kernel.org/stable/c/992ba40a67638dfe2772b84dfc8168dc328d5c4c · Patch
• https://git.kernel.org/stable/c/1eb5395add786613c7c5579d3947aa0b8f0ec241 · Patch
• https://osv.dev/vulnerability/UBUNTU-CVE-2021-47562 · Vendor Advisory
• https://osv.dev/vulnerability/SUSE-SU-2024:2010-1 · Vendor Advisory
• https://osv.dev/vulnerability/SUSE-SU-2024:2011-1 · Vendor Advisory
• https://osv.dev/vulnerability/SUSE-SU-2024:2019-1 · Vendor Advisory
• https://ubuntu.com/security/CVE-2021-47562 · Vendor Advisory
• https://git.kernel.org/stable/c/792b2086584f25d84081a526beee80d103c2a913 · Patch
• https://osv.dev/vulnerability/SUSE-SU-2024:2190-1 · Vendor Advisory
• https://osv.dev/vulnerability/SUSE-SU-2024:2185-1 · Vendor Advisory