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CVE-2024-1086: kernel
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CVE-2023-23583: microcode_ctl
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CVE-2023-4911: glibc
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CVE-2024-1086: kernel
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CVE-2024-1086: kernel
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<a href="https://git.resf.org/security/wiki/_edit/main/docs/issues/CVE-2024-1086.md" title="Edit this page" class="md-content__button md-icon">
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<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24"><path d="M10 20H6V4h7v5h5v3.1l2-2V8l-6-6H6c-1.1 0-2 .9-2 2v16c0 1.1.9 2 2 2h4v-2m10.2-7c.1 0 .3.1.4.2l1.3 1.3c.2.2.2.6 0 .8l-1 1-2.1-2.1 1-1c.1-.1.2-.2.4-.2m0 3.9L14.1 23H12v-2.1l6.1-6.1 2.1 2.1Z"/></svg>
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<h1 id="cve-2024-1086-kernel">CVE-2024-1086: kernel<a class="headerlink" href="#cve-2024-1086-kernel" title="Permanent link">¶</a></h1>
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<h2 id="title">Title<a class="headerlink" href="#title" title="Permanent link">¶</a></h2>
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<p>CVE-2024-1086: kernel: nf_tables: use-after-free vulnerability in the nft_verdict_init() function</p>
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<h2 id="summary">Summary<a class="headerlink" href="#summary" title="Permanent link">¶</a></h2>
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<p>As <a href="https://access.redhat.com/security/cve/CVE-2024-1086">briefly described by Red Hat</a>:</p>
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<p>A flaw was found in the Netfilter subsystem in the Linux kernel. This issue occurs in the <code>nft_verdict_init()</code> function, allowing positive values as a drop error within the hook verdict, therefore, the <code>nf_hook_slow()</code> function can cause a double-free vulnerability when <code>NF_DROP</code> is issued with a drop error that resembles <code>NF_ACCEPT</code>. The <code>nf_tables</code> component can be exploited to achieve local privilege escalation.</p>
|
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<p>Exploitation of the flaw is <a href="https://pwning.tech/nftables/">described in great detail in a blog post by Notselwyn</a>.</p>
|
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<p>Public disclosure date: March 26, 2024 for the above blog post, which made the issue widely known</p>
|
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<h2 id="status">Status<a class="headerlink" href="#status" title="Permanent link">¶</a></h2>
|
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<p>Both EL9 and EL8 are affected. We will of course rebuild upstream's fix as soon as it arrives.</p>
|
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<h2 id="mitigation">Mitigation<a class="headerlink" href="#mitigation" title="Permanent link">¶</a></h2>
|
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<p>Meanwhile, we recommend two mitigations:</p>
|
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<ul>
|
|
<li>If you don't use containers, we recommend that you disable user namespaces e.g. by running the below commands as root:</li>
|
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</ul>
|
|
<div class="highlight"><pre><span></span><code>echo user.max_user_namespaces=0 > /etc/sysctl.d/userns.conf
|
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sysctl -p /etc/sysctl.d/userns.conf
|
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</code></pre></div>
|
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<p>This is a mitigation also suggested by Red Hat.
|
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It is expected to fully mitigate this and other/future related vulnerabilities.</p>
|
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<ul>
|
|
<li>Install our <a href="../../packages/lkrg/">package of LKRG</a>, start and enable the service.</li>
|
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</ul>
|
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<p>This does not fully mitigate the vulnerability,
|
|
but it reliably prevents the specific exploit referenced above from working and produces LKRG alerts when the exploit is run.
|
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LKRG's feature that does so is its allow list for the kernel's usermodehelper.
|
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This will similarly prevent other/future exploits that abuse usermodehelper.</p>
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<span class="git-revision-date-localized-plugin git-revision-date-localized-plugin-date">March 28, 2024</span>
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