CVE-2022-49911 Affecting kernel-rt-trace-kvm package, versions *


Severity

Recommended
0.0
medium
0
10

Based on Red Hat Enterprise Linux security rating.

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  • Snyk IDSNYK-RHEL7-KERNELRTTRACEKVM-9946025
  • published2 May 2025
  • disclosed1 May 2025

Introduced: 1 May 2025

NewCVE-2022-49911  (opens in a new tab)

How to fix?

There is no fixed version for RHEL:7 kernel-rt-trace-kvm.

NVD Description

Note: Versions mentioned in the description apply only to the upstream kernel-rt-trace-kvm package and not the kernel-rt-trace-kvm package as distributed by RHEL. See How to fix? for RHEL:7 relevant fixed versions and status.

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

netfilter: ipset: enforce documented limit to prevent allocating huge memory

Daniel Xu reported that the hash:net,iface type of the ipset subsystem does not limit adding the same network with different interfaces to a set, which can lead to huge memory usage or allocation failure.

The quick reproducer is

$ ipset create ACL.IN.ALL_PERMIT hash:net,iface hashsize 1048576 timeout 0 $ for i in $(seq 0 100); do /sbin/ipset add ACL.IN.ALL_PERMIT 0.0.0.0/0,kaf_$i timeout 0 -exist; done

The backtrace when vmalloc fails:

    [Tue Oct 25 00:13:08 2022] ipset: vmalloc error: size 1073741848, exceeds total pages
    <...>
    [Tue Oct 25 00:13:08 2022] Call Trace:
    [Tue Oct 25 00:13:08 2022]  <TASK>
    [Tue Oct 25 00:13:08 2022]  dump_stack_lvl+0x48/0x60
    [Tue Oct 25 00:13:08 2022]  warn_alloc+0x155/0x180
    [Tue Oct 25 00:13:08 2022]  __vmalloc_node_range+0x72a/0x760
    [Tue Oct 25 00:13:08 2022]  ? hash_netiface4_add+0x7c0/0xb20
    [Tue Oct 25 00:13:08 2022]  ? __kmalloc_large_node+0x4a/0x90
    [Tue Oct 25 00:13:08 2022]  kvmalloc_node+0xa6/0xd0
    [Tue Oct 25 00:13:08 2022]  ? hash_netiface4_resize+0x99/0x710
    <...>

The fix is to enforce the limit documented in the ipset(8) manpage:

> The internal restriction of the hash:net,iface set type is that the same > network prefix cannot be stored with more than 64 different interfaces > in a single set.

CVSS Base Scores

version 3.1