VulnerabilityPublished 25 Sep 2026Updated 19 Oct 2026

CVE-2026-97551: Linux kernel · xfs: initialise args->total for parent pointer updates

Affects Linux kernelSource CVE Database V5

Not known to be exploited · fixed in c66e138af626cad4210da449996ae9e07ee63add : update Linux kernel when convenient.

Data as of 26 Oct 2026, 12:55 UTC

Severity

Unrated

Rated by Threat Radar · CVSS not yet scored by NVD

EPSS: 0.2% chance of exploitation in 30 days – higher than 9% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch: Available – fixed in c66e138af626cad4210da449996ae9e07ee63add, ac9032882d673dd6679e1d873a2dc0131a1aeb43, 9ad85bce62cadfdf4242f6e6bbff2a52e51d30f1 +1

Exploitation evidence

Disclosed: evidence found.
CVE published 25 Sep 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 26 Oct 2026.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponised: Public exploit code exists in Metasploit or Exploit-DB, or CISA SSVC or the CVSS exploit maturity reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

What to do

Upgrade Linux kernel to c66e138af626cad4210da449996ae9e07ee63add, ac9032882d673dd6679e1d873a2dc0131a1aeb43, 9ad85bce62cadfdf4242f6e6bbff2a52e51d30f1 or 8e4ebb6afaa34bd2e8ce52da231003d24111c2d6.

Affected software

Product	Affected	Fixed in
LinuxLinux	Affected ≥ b7c62d90c12c6cc86f10b8a62cefe0029374b6ff, < c66e138af626cad4210da449996ae9e07ee63add	Fixed in c66e138af626cad4210da449996ae9e07ee63add
LinuxLinux	Affected ≥ b7c62d90c12c6cc86f10b8a62cefe0029374b6ff, < ac9032882d673dd6679e1d873a2dc0131a1aeb43	Fixed in ac9032882d673dd6679e1d873a2dc0131a1aeb43
LinuxLinux	Affected ≥ b7c62d90c12c6cc86f10b8a62cefe0029374b6ff, < 9ad85bce62cadfdf4242f6e6bbff2a52e51d30f1	Fixed in 9ad85bce62cadfdf4242f6e6bbff2a52e51d30f1
LinuxLinux	Affected ≥ b7c62d90c12c6cc86f10b8a62cefe0029374b6ff, < 8e4ebb6afaa34bd2e8ce52da231003d24111c2d6	Fixed in 8e4ebb6afaa34bd2e8ce52da231003d24111c2d6
LinuxLinux	Affected =6.10	Fixed in–

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.

References

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