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CVE-2026-97551

Linux: xfs: initialise args->total for parent pointer updates

Linux LinuxOperating systems
Open in ThreatlineRecord JSON
CVSS
NoneNot scored
ExploitationNo known exploitationNot in CISA KEV, which does not prove it is unexploitedCISA KEV
Exploit odds (EPSS)0.20%Chance of exploitation activity in the next 30 days, higher than 9% of CVEs. Scored 23 Oct 2026FIRST EPSS
Fixed in9ad85bce62cadfdf4242f6e6bbff2a52e51d30f1Also 8e4ebb6afaa34bd2e8ce52da231003d24111c2d6CVE List
Published25 Sep 2026Updated 19 Oct 2026CVE List

What fixes it

  • 9ad85bce62cadfdf4242f6e6bbff2a52e51d30f1LinuxCVE List
  • 8e4ebb6afaa34bd2e8ce52da231003d24111c2d6LinuxCVE List

A fixed version on one release line is not the upgrade target for every line. Check your exact version and any vendor backports.

Description

In the Linux kernel, the following vulnerability has been resolved:

xfs: initialise args->total for parent pointer updates

xfs_parent_da_args_init() builds an xfs_da_args from a zeroed xfs_parent_args (kmem_cache_zalloc), leaving args->total == 0. xfs_da_grow_inode_int() treats that field as a running block reservation and subtracts from it; because it is an xfs_extlen_t (uint32_t), the first attr-fork growth wraps it to ~0U. That defeats the free-space check in xfs_alloc_space_available(), and when it coincides with an AG that has exactly zero available blocks the allocation is clamped to maxlen 0 and returns -ENOSPC, which xfs_defer_finish_noroll() escalates to a filesystem shutdown.

Set args->total the way the log recovery path does (xfs_attri_recover_work(), xfs_attr_item.c:706), in the add and replace paths that can grow the fork. Removals and lookups never grow it, so they leave the field alone, matching that switch.

Text from CVE List

Affected versions 10

  • Linuxaffected: b7c62d90c12c6cc86f10b8a62cefe0029374b6ff before 9ad85bce62cadfdf4242f6e6bbff2a52e51d30f1CVE List
  • Linuxaffected: b7c62d90c12c6cc86f10b8a62cefe0029374b6ff before c66e138af626cad4210da449996ae9e07ee63addCVE List
  • Linuxaffected: b7c62d90c12c6cc86f10b8a62cefe0029374b6ff before ac9032882d673dd6679e1d873a2dc0131a1aeb43CVE List
  • Linuxaffected: b7c62d90c12c6cc86f10b8a62cefe0029374b6ff before 8e4ebb6afaa34bd2e8ce52da231003d24111c2d6CVE List
  • Linuxaffected: 6.10CVE List
  • Linuxunaffected: all versions before 6.10CVE List
  • Linuxunaffected: 6.12.111 through 6.12.*CVE List
  • Linuxunaffected: 6.18.53 through 6.18.*CVE List
  • Linuxunaffected: 7.2.7 through 7.2.*CVE List
  • Linuxunaffected: 7.3CVE List

References 4