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CVE-2024-39503

Disclosure Date: July 12, 2024 •
CVE-2024-39503
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Description

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

netfilter: ipset: Fix race between namespace cleanup and gc in the list:set type

Lion Ackermann reported that there is a race condition between namespace cleanup
in ipset and the garbage collection of the list:set type. The namespace
cleanup can destroy the list:set type of sets while the gc of the set type is
waiting to run in rcu cleanup. The latter uses data from the destroyed set which
thus leads use after free. The patch contains the following parts:

  • When destroying all sets, first remove the garbage collectors, then wait
    if needed and then destroy the sets.
  • Fix the badly ordered “wait then remove gc” for the destroy a single set
    case.
  • Fix the missing rcu locking in the list:set type in the userspace test
    case.
  • Use proper RCU list handlings in the list:set type.

The patch depends on c1193d9bbbd3 (netfilter: ipset: Add list flush to cancel_gc).

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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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Integrity (I):
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Availability (A):
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General Information

Offensive Application
Unknown
Utility Class
Unknown
Ports
Unknown
OS
Unknown
Vulnerable Versions
Linux c0761d1f1ce1
Linux 93b53c202b51
Linux 0f1bb77c6d83
Linux 390b353d1a1d
Linux 2ba35b37f780
Linux 90ae20d47de6
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