CVE-2021-46998

HIGH
Published Feb 28, 2024 Modified Dec 6, 2024 CWE-416

Description

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.

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CVSS v3.1 Score

7.8
HIGH
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Weakness Type (CWE)

CWE-416 Use After Free

Affected Products

Vendor Product
linux linux_kernel
linux linux_kernel
linux linux_kernel
linux linux_kernel
linux linux_kernel

References

Advisories & Patches

https://git.kernel.org/stable/c/25a87b1f566b5eb2af2857a928f0e2310d900976 https://git.kernel.org/stable/c/643001b47adc844ae33510c4bb93c236667008a3 https://git.kernel.org/stable/c/6892396ebf04ea2c021d80e10f4075e014cd7cc3 https://git.kernel.org/stable/c/7afdd6aba95c8a526038e7abe283eeac3e4320f1 https://git.kernel.org/stable/c/d90529392aaf498dafa95d212295d64b2cea4e24 https://git.kernel.org/stable/c/f7f6f07774091a6ddd98500b85386c3c6afb30d3 https://git.kernel.org/stable/c/25a87b1f566b5eb2af2857a928f0e2310d900976 https://git.kernel.org/stable/c/643001b47adc844ae33510c4bb93c236667008a3 https://git.kernel.org/stable/c/6892396ebf04ea2c021d80e10f4075e014cd7cc3 https://git.kernel.org/stable/c/7afdd6aba95c8a526038e7abe283eeac3e4320f1 https://git.kernel.org/stable/c/d90529392aaf498dafa95d212295d64b2cea4e24 https://git.kernel.org/stable/c/f7f6f07774091a6ddd98500b85386c3c6afb30d3

Frequently Asked Questions

What is 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. It has a CVSS v3.1 base score of 7.8 (HIGH).
How severe is CVE-2021-46998? +
CVE-2021-46998 has a CVSS v3.1 score of 7.8 out of 10, rated HIGH. This is a high-severity vulnerability that should be prioritized for patching.
What products are affected by CVE-2021-46998? +
CVE-2021-46998 affects products from linux, specifically: linux_kernel. Check the affected products table above for specific version ranges.
How do I check if I'm vulnerable to CVE-2021-46998? +
You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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