netfs: Fix netfs_create_write_req() to handle async cache object creation
CVE-2026-72366 · published 15 Aug 2026
How serious is it
- Severity: critical, CVSS score 9.8 out of 10.
- No exploit prediction (EPSS) score yet.
- Not on the CISA list of exploited vulnerabilities.
- No public exploit in Exploit-DB.
Is your app affected by CVE-2026-72366?
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Who is affected
- Linux Linux: 7b589a9b45ae32aa9d7bece597490e141198d7a6 to < aee03fbc8803a40d65e20f1af816a7219048a426, 7b589a9b45ae32aa9d7bece597490e141198d7a6 to < 8ab75e445c161c4cb504aa98e20ce1dd1ecd8e9a, 7b589a9b45ae32aa9d7bece597490e141198d7a6 to < 1188a9846fadeacf9d1430b528e5217f749d665b, 7b589a9b45ae32aa9d7bece597490e141198d7a6 to < dbd6f56d975b23241b7bbb11bb8f562af548a0aa
- Linux Linux: 6.11
How to check
- Find out whether you run the affected product and which version, then compare it with the versions above.
How to fix
Copies a prompt for Claude Code, Cursor or Codex that asks it to check whether you run this product.
- Apply the vendor's update or mitigation from the references below. If there is none yet, limit exposure of the affected service until there is.
- If a vulnerable version was live, check your logs and rotate the secrets that server could read.
The advisory
In the Linux kernel, the following vulnerability has been resolved:
netfs: Fix netfs_create_write_req() to handle async cache object creation
netfs_create_write_req() will skip caching if the fscache cookie is
disabled, but this is a problem because async cache object creation might
not have got far enough yet that has been enabled - thereby causing the
call to fscache_begin_write_operation() to be skipped.
Fix this by removing the checks on the cookie and delegating this to
fscache_begin_write_operation().
Check your whole app
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References
- git.kernel.org/stable/c/aee03fbc8803a40d65e20f1af816a7219048a426
- git.kernel.org/stable/c/8ab75e445c161c4cb504aa98e20ce1dd1ecd8e9a
- git.kernel.org/stable/c/1188a9846fadeacf9d1430b528e5217f749d665b
- git.kernel.org/stable/c/dbd6f56d975b23241b7bbb11bb8f562af548a0aa
Merged from CVE List. Last updated 25 Oct 2026. All vulnerabilities · RSS · JSON