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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 >
< h2 id = "title" > Title< a class = "headerlink" href = "#title" title = "Permanent link" > ¶ < / a > < / h2 >
< p > CVE-2024-1086: kernel: nf_tables: use-after-free vulnerability in the nft_verdict_init() function< / p >
< h2 id = "summary" > Summary< a class = "headerlink" href = "#summary" title = "Permanent link" > ¶ < / a > < / h2 >
< p > As < a href = "https://access.redhat.com/security/cve/CVE-2024-1086" > briefly described by Red Hat< / a > :< / p >
< 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 >
< p > Exploitation of the flaw is < a href = "https://pwning.tech/nftables/" > described in great detail in a blog post by Notselwyn< / a > .< / p >
< p > Public disclosure date: March 26, 2024 for the above blog post, which made the issue widely known< / p >
< h2 id = "status" > Status< a class = "headerlink" href = "#status" title = "Permanent link" > ¶ < / a > < / h2 >
< p > Both EL9 and EL8 are affected. We will of course rebuild upstream's fix as soon as it arrives.< / p >
< h2 id = "mitigation" > Mitigation< a class = "headerlink" href = "#mitigation" title = "Permanent link" > ¶ < / a > < / h2 >
< p > Meanwhile, we recommend two mitigations:< / p >
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< ul >
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< 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 >
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< div class = "highlight" > < pre > < span > < / span > < code > echo user.max_user_namespaces=0 > /etc/sysctl.d/userns.conf
sysctl -p /etc/sysctl.d/userns.conf
< / code > < / pre > < / div >
< p > This is a mitigation also suggested by Red Hat.
It is expected to fully mitigate this and other/future related vulnerabilities.< / p >
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< ul >
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< li > Install our < a href = "../../packages/lkrg/" > package of LKRG< / a > , start and enable the service.< / li >
2024-03-28 19:38:14 +00:00
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2024-03-28 19:06:47 +00:00
< 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.
LKRG's feature that does so is its allow list for the kernel's usermodehelper.
This will similarly prevent other/future exploits that abuse usermodehelper.< / p >
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