What’s Vulnerable › Vulnerabilities

CVE-2023-53705: ipv6: Fix out-of-bounds access in ipv6_find_tlv()

• Severity: high (CVSS 8.2 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.6% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2025-10-22 · updated 2026-10-28

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.

Affected products

• Linux kernel: 2.6.19 — fixed in 6.4

How to fix

Upgrade to a fixed version: Linux kernel 6.4. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/011f47c8b8389154f996f5f69da8efc3a3beefef
• https://git.kernel.org/stable/c/04bf69e3de435d793a203aacc4b774f8f9f2baeb
• https://git.kernel.org/stable/c/59e656d0d4a84ea0ee9a39c6f69160a3effccc94
• https://git.kernel.org/stable/c/878ecb0897f4737a4c9401f3523fd49589025671
• https://git.kernel.org/stable/c/91dd8aab9c9f193210681b86b6b92840ffe74f0c
• https://git.kernel.org/stable/c/9b92e2d0eb696d7586ba832c8854653b59887da0
• https://git.kernel.org/stable/c/ae68c0f7edbc9a294094ce03a0aaf45aa489ce40
• https://git.kernel.org/stable/c/e5f82688ae10f5f386952e65e941bb8868ee54dc

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