CVE-2023-53705 ipv6: Fix out-of-bounds access in ipv6_find_tlv()
An out-of-bounds access in the Linux kernel IPv6 implementation allows attackers to cause denial of service or potentially execute code.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2023-53705?
CVE-2023-53705 is a high-severity memory corruption vulnerability in Linux, published on 22 Oct 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
In the Linux kernel, the following vulnerability has been resolved:
ipv6: Fix out-of-bounds access in ipv6_find_tlv()
optlen is fetched without checking whether there is more than one byte to parse. It can lead to out-of-bounds access.
Found by InfoTeCS on behalf of Linux Verification Center (linuxtesting.org) with SVACE.
Which versions are affected by CVE-2023-53705?
How do I fix CVE-2023-53705?
Apply the vendor's patch.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2023-53705 being exploited?
There is no known exploitation of CVE-2023-53705 in the wild and no public exploit code.
Sources
Also known as BELL-CVE-2023-53705, DEBIAN-CVE-2023-53705, GHSA-27mw-8p8v-6j5h, UBUNTU-CVE-2023-53705.