CVE-2021-46998

  1. OpenCVE
  2. Vulnerabilities (CVE)
  3. CVE-2021-46998
In the Linux kernel, the following vulnerability has been resolved: ethernet:enic: Fix a use after free bug in enic_hard_start_xmit In enic_hard_start_xmit, it calls enic_queue_wq_skb(). Inside enic_queue_wq_skb, if some error happens, the skb will be freed by dev_kfree_skb(skb). But the freed skb is still used in skb_tx_timestamp(skb). My patch makes enic_queue_wq_skb() return error and goto spin_unlock() incase of error. The solution is provided by Govind. See https://lkml.org/lkml/2021/4/30/961.

7.8 /10

CVSS v3 : HIGH

V3 Legend

Vector :

Exploitability : 1.8 / Impact : 5.9

Attack Vector LOCAL

Attack Complexity LOW

Privileges Required LOW

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact HIGH

Scope UNCHANGED

References
Link Resource
https://git.kernel.org/stable/c/25a87b1f566b5eb2af2857a928f0e2310d900976 Patch
https://git.kernel.org/stable/c/643001b47adc844ae33510c4bb93c236667008a3 Patch
https://git.kernel.org/stable/c/6892396ebf04ea2c021d80e10f4075e014cd7cc3 Patch
https://git.kernel.org/stable/c/7afdd6aba95c8a526038e7abe283eeac3e4320f1 Patch
https://git.kernel.org/stable/c/d90529392aaf498dafa95d212295d64b2cea4e24 Patch
https://git.kernel.org/stable/c/f7f6f07774091a6ddd98500b85386c3c6afb30d3 Patch
https://git.kernel.org/stable/c/25a87b1f566b5eb2af2857a928f0e2310d900976 Patch
https://git.kernel.org/stable/c/643001b47adc844ae33510c4bb93c236667008a3 Patch
https://git.kernel.org/stable/c/6892396ebf04ea2c021d80e10f4075e014cd7cc3 Patch
https://git.kernel.org/stable/c/7afdd6aba95c8a526038e7abe283eeac3e4320f1 Patch
https://git.kernel.org/stable/c/d90529392aaf498dafa95d212295d64b2cea4e24 Patch
https://git.kernel.org/stable/c/f7f6f07774091a6ddd98500b85386c3c6afb30d3 Patch
Configurations

Configuration 1 (hide)

OR cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
History

06 Dec 2024, 14:56

Type Values Removed Values Added
First Time Linux linux Kernel
Linux
References () https://git.kernel.org/stable/c/25a87b1f566b5eb2af2857a928f0e2310d900976 - () https://git.kernel.org/stable/c/25a87b1f566b5eb2af2857a928f0e2310d900976 - Patch
References () https://git.kernel.org/stable/c/643001b47adc844ae33510c4bb93c236667008a3 - () https://git.kernel.org/stable/c/643001b47adc844ae33510c4bb93c236667008a3 - Patch
References () https://git.kernel.org/stable/c/6892396ebf04ea2c021d80e10f4075e014cd7cc3 - () https://git.kernel.org/stable/c/6892396ebf04ea2c021d80e10f4075e014cd7cc3 - Patch
References () https://git.kernel.org/stable/c/7afdd6aba95c8a526038e7abe283eeac3e4320f1 - () https://git.kernel.org/stable/c/7afdd6aba95c8a526038e7abe283eeac3e4320f1 - Patch
References () https://git.kernel.org/stable/c/d90529392aaf498dafa95d212295d64b2cea4e24 - () https://git.kernel.org/stable/c/d90529392aaf498dafa95d212295d64b2cea4e24 - Patch
References () https://git.kernel.org/stable/c/f7f6f07774091a6ddd98500b85386c3c6afb30d3 - () https://git.kernel.org/stable/c/f7f6f07774091a6ddd98500b85386c3c6afb30d3 - Patch
CWE CWE-416
CPE cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
CVSS v2 : unknown
v3 : unknown 		v2 : unknown
v3 : 7.8

21 Nov 2024, 06:35

Type Values Removed Values Added
References () https://git.kernel.org/stable/c/25a87b1f566b5eb2af2857a928f0e2310d900976 - () https://git.kernel.org/stable/c/25a87b1f566b5eb2af2857a928f0e2310d900976 -
References () https://git.kernel.org/stable/c/643001b47adc844ae33510c4bb93c236667008a3 - () https://git.kernel.org/stable/c/643001b47adc844ae33510c4bb93c236667008a3 -
References () https://git.kernel.org/stable/c/6892396ebf04ea2c021d80e10f4075e014cd7cc3 - () https://git.kernel.org/stable/c/6892396ebf04ea2c021d80e10f4075e014cd7cc3 -
References () https://git.kernel.org/stable/c/7afdd6aba95c8a526038e7abe283eeac3e4320f1 - () https://git.kernel.org/stable/c/7afdd6aba95c8a526038e7abe283eeac3e4320f1 -
References () https://git.kernel.org/stable/c/d90529392aaf498dafa95d212295d64b2cea4e24 - () https://git.kernel.org/stable/c/d90529392aaf498dafa95d212295d64b2cea4e24 -
References () https://git.kernel.org/stable/c/f7f6f07774091a6ddd98500b85386c3c6afb30d3 - () https://git.kernel.org/stable/c/f7f6f07774091a6ddd98500b85386c3c6afb30d3 -
Summary
  • (es) En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: ethernet:enic: corrige un error de use after free en enic_hard_start_xmit. En enic_hard_start_xmit, llama a enic_queue_wq_skb(). Dentro de enic_queue_wq_skb, si ocurre algún error, dev_kfree_skb(skb) liberará el skb. Pero el skb liberado todavía se usa en skb_tx_timestamp(skb). Mi parche hace que enic_queue_wq_skb() devuelva un error y vaya a spin_unlock() en caso de error. La solución la proporciona Govind. Consulte https://lkml.org/lkml/2021/4/30/961.

28 Feb 2024, 09:15

Type Values Removed Values Added
New CVE
Information

Published : 2024-02-28 09:15

Updated : 2024-12-06 14:56

NVD link : CVE-2021-46998

Mitre link : CVE-2021-46998

CVE.ORG link : CVE-2021-46998

JSON object : View

Products Affected

linux

  • linux_kernel
CWE
CWE-416

Use After Free