CVE-2021-47242
7.5 · HIGHOverview
CVE-2021-47242 is a high-severity vulnerability affecting linux linux_kernel. It was published on May 21, 2024 and has a CVSS 3.1 base score of 7.5 (HIGH).
This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.
Technical Description
In the Linux kernel, the following vulnerability has been resolved:
mptcp: fix soft lookup in subflow_error_report()
Maxim reported a soft lookup in subflow_error_report():
watchdog: BUG: soft lockup - CPU#0 stuck for 22s! [swapper/0:0]
RIP: 0010:native_queued_spin_lock_slowpath
RSP: 0018:ffffa859c0003bc0 EFLAGS: 00000202
RAX: 0000000000000101 RBX: 0000000000000001 RCX: 0000000000000000
RDX: ffff9195c2772d88 RSI: 0000000000000000 RDI: ffff9195c2772d88
RBP: ffff9195c2772d00 R08: 00000000000067b0 R09: c6e31da9eb1e44f4
R10: ffff9195ef379700 R11: ffff9195edb50710 R12: ffff9195c2772d88
R13: ffff9195f500e3d0 R14: ffff9195ef379700 R15: ffff9195ef379700
FS: 0000000000000000(0000) GS:ffff91961f400000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000c000407000 CR3: 0000000002988000 CR4: 00000000000006f0
Call Trace:
<IRQ>
_raw_spin_lock_bh
subflow_error_report
mptcp_subflow_data_available
__mptcp_move_skbs_from_subflow
mptcp_data_rea
Remediation
Check the references section for vendor advisories and patches from linux. Update linux_kernel to the latest patched version. 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.
Affected Products
| Vendor | Product | Versions | Status |
|---|---|---|---|
| linux | linux_kernel | >= 5.11.12, < 5.12.13 | Affected |
Frequently Asked Questions
What is CVE-2021-47242?
CVE-2021-47242 is a high-severity vulnerability affecting linux linux_kernel. It was published on May 21, 2024 and has a CVSS 3.1 base score of 7.5 (HIGH).
How severe is CVE-2021-47242?
This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.
How do I fix or remediate CVE-2021-47242?
Check the references section for vendor advisories and patches from linux. Update linux_kernel to the latest patched version. 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-2021-47242?
CyberStrike's AI-powered security agents can automatically detect CVE-2021-47242 across your infrastructure using autonomous pentesting, DAST scanning, and HackBrowser. The platform continuously monitors for known vulnerabilities and provides actionable remediation guidance prioritized by real-world exploitability.
How CyberStrike Helps
AI agents map your attack surface to find vulnerabilities like this one.
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