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CVE-2021-46925

7.8 · HIGH

In the Linux kernel, the following vulnerability has been resolved: net/smc: fix kernel panic caused by race of smc_sock A crash occurs when smc_cdc_tx_handler() tries to access smc_sock but smc_…

Published Feb 27, 2024CWE-362EPSS 0.18%

Overview

CVE-2021-46925 is a high-severity vulnerability. It was published on February 27, 2024 and has a CVSS 3.1 base score of 7.8 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.8, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

Technical description

In the Linux kernel, the following vulnerability has been resolved:

net/smc: fix kernel panic caused by race of smc_sock

A crash occurs when smc_cdc_tx_handler() tries to access smc_sock

but smc_release() has already freed it.

[ 4570.695099] BUG: unable to handle page fault for address: 000000002eae9e88

[ 4570.696048] #PF: supervisor write access in kernel mode

[ 4570.696728] #PF: error_code(0x0002) - not-present page

[ 4570.697401] PGD 0 P4D 0

[ 4570.697716] Oops: 0002 [#1] PREEMPT SMP NOPTI

[ 4570.698228] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.16.0-rc4+ #111

[ 4570.699013] Hardware name: Alibaba Cloud Alibaba Cloud ECS, BIOS 8c24b4c 04/0

[ 4570.699933] RIP: 0010:_raw_spin_lock+0x1a/0x30

<...>

[ 4570.711446] Call Trace:

[ 4570.711746] <IRQ>

[ 4570.711992] smc_cdc_tx_handler+0x41/0xc0

[ 4570.712470] smc_wr_tx_tasklet_fn+0x213/0x560

[ 4570.712981] ? smc_cdc_tx_dismisser+0x10/0x10

[ 4570.713489] tasklet_action_common.isra.17+0x66/0x140

[ 4570.714083] __do_softirq+0x123/0x2f

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refgit.kernel.org/stable/c/349d43127dac00c15231e8ffbcaabd70f7b0e544Refgit.kernel.org/stable/c/b85f751d71ae8e2a15e9bda98852ea9af35282ebRefgit.kernel.org/stable/c/e8a5988a85c719ce7205cb00dcf0716dcf611332Refgit.kernel.org/stable/c/349d43127dac00c15231e8ffbcaabd70f7b0e544Refgit.kernel.org/stable/c/b85f751d71ae8e2a15e9bda98852ea9af35282ebRefgit.kernel.org/stable/c/e8a5988a85c719ce7205cb00dcf0716dcf611332

How CyberStrike helps

Frequently asked questions

What is CVE-2021-46925?

CVE-2021-46925 is a high-severity vulnerability. It was published on February 27, 2024 and has a CVSS 3.1 base score of 7.8 (HIGH).

How severe is CVE-2021-46925?

This vulnerability has a CVSS 3.1 base score of 7.8, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2021-46925?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2021-46925?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2021-46925 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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