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CVE-2024-50142

Disclosure Date: November 07, 2024 •
CVE-2024-50142
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Description

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

xfrm: validate new SA’s prefixlen using SA family when sel.family is unset

This expands the validation introduced in commit 07bf7908950a (“xfrm:
Validate address prefix lengths in the xfrm selector.”)

syzbot created an SA with

usersa.sel.family = AF_UNSPEC
usersa.sel.prefixlen_s = 128
usersa.family = AF_INET

Because of the AF_UNSPEC selector, verify_newsainfo doesn’t put
limits on prefixlen{s,d}. But then copy_from_user_state sets
x->sel.family to usersa.family (AF_INET). Do the same conversion in
verify_newsainfo before validating prefixlen{s,d}, since that’s how
prefixlen is going to be used later on.

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CVSS V3 Severity and Metrics
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Impact Score:
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Attack Vector (AV):
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General Information

Offensive Application
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Utility Class
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Ports
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OS
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Vulnerable Versions
Linux f31398570acf
Linux not down converted
Prerequisites
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Discovered By
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PoC Author
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Metasploit Module
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Reporter
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Vendors

  • Linux

Products

  • Linux
Technical Analysis