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CVE Record

CVE-2026-43153: xfs: remove xfs_attr_leaf_hasname

In the Linux kernel, the following vulnerability has been resolved: xfs: remove xfs_attr_leaf_hasname The calling convention of xfs_attr_leaf_hasname() is problematic, because it returns a NULL buffer when xfs_attr3_leaf_read fails, a valid buffer when xfs_attr3_leaf_lookup_int returns -ENOATTR or -EEXIST, and a non-NULL buffer pointer for an already released buffer when xfs_attr3_leaf_lookup_int fails with other error values. Fix this by simply open coding xfs_attr_leaf_hasname in the callers, so that the buffer release code is done by each caller of xfs_attr3_leaf_read.

HighCVSS 7.8Not KEV-listedUpdated
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Glexia's TakeAutomated analysishigh

Security readout for executives and security teams

Plain-English summary

A Linux XFS filesystem error can mishandle an internal memory buffer after an attribute lookup fails. A locally authenticated, low-privilege user may be able to trigger serious confidentiality, integrity, or availability impact. The supplied CVSS score is 7.8, but the sources provide no evidence of active exploitation.

Executive priority

Treat as a high-priority kernel maintenance issue, especially on shared Linux servers using XFS. Schedule prompt, tested kernel updates. Emergency incident response is not justified solely by this bundle because active exploitation is not reported and exploitation requires local privileges.

Technical view

xfs_attr_leaf_hasname() could return a pointer to an already released buffer when xfs_attr3_leaf_lookup_int() failed with errors other than -ENOATTR or -EEXIST. Callers could consequently mishandle buffer lifetime. The fix removes the helper and places read, lookup, and release handling directly in each caller.

Likely exposure

Exposure is limited to Linux systems within the source-listed affected versions where XFS and the vulnerable attribute-handling paths are used. Exploitation requires local access with low privileges. The supplied version data is ambiguous, so confirm exposure against distribution kernel advisories and backport records.

Exploitation context

The CVSS vector describes a local, low-complexity attack requiring low privileges and no user interaction, with potentially high confidentiality, integrity, and availability impact. KEV is false, and the supplied sources do not report public or active exploitation. No remote attack path is established.

Researcher notes

The defect concerns inconsistent ownership and release semantics across XFS attribute read and lookup failures. No CWE is supplied, and the bundle does not establish exploitability beyond the CVSS assessment. Exact vulnerable and fixed version boundaries are unclear; use commit-level and distribution backport verification.

Mitigation direction

  • Install a vendor-supported kernel containing the applicable upstream XFS fix.
  • Check distribution advisories for backported fixes before relying on kernel version numbers.
  • Prioritize multi-user systems and hosts processing untrusted XFS filesystems.
  • Restrict unnecessary local access until affected kernels are updated.

Validation and detection

  • Inventory kernel versions and identify systems actively using XFS.
  • Compare vendor kernel packages and changelogs with the four referenced fix commits.
  • Confirm the updated kernel is running after installation and reboot.
  • Review kernel logs for XFS errors or unexpected crashes without treating them as proof of exploitation.
Prepared
Confidence
medium
Sources
6

Public sources used

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

Conservative CVE-to-ATT&CK context

These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.

ATT&CK lookup starting points

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CVE-2026-43153 mapping review

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Vulnerability profileCVE Program record
Severity
High
CVSS
7.8 (3.1)
Known Exploited
No
Published

Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

1CVSS vectors
3Timeline events
0ADP providers
5Source links

CVSS vector scores

1 official score

We collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.

ScoreVersionSeverityVectorExploitImpactSource
7.8CVSS 3.1HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H1.85.9Linux

Vulnerability scoring details

Base CVSS 3.1 score

7.8High
CVSS 3.1 vector shape for CVE-2026-43153Attack VectorAttack ComplexityPrivileges RequiredUser InteractionScopeConfidentiality ImpactIntegrity ImpactAvailability Impact

Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Attack Vector
NetworkAdjacentLocalPhysical
Attack Complexity
LowHigh
Privileges Required
NoneLowHigh
User Interaction
NoneRequired
Scope
ChangedUnchanged
Confidentiality Impact
HighLowNone
Integrity Impact
HighLowNone
Availability Impact
HighLowNone

Vulnerability timeline

Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.

  1. CVE reservedCVE Program

    The CVE ID was reserved by the assigning CNA.

  2. CVE publishedCVE Program

    The CVE record was published.

  3. CVE updatedCVE Program

    The CVE record metadata indicates this as the latest update time.

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
LinuxLinux07120f1abdff80f3d1351f733661abe28d609535, 07120f1abdff80f3d1351f733661abe28d609535, 07120f1abdff80f3d1351f733661abe28d609535, 07120f1abdff80f3d1351f733661abe28d609535unaffected
LinuxLinux5.9, 0, 6.12.75, 6.18.16, 6.19.6, 7.0affected
Weakness

CWE details

No CWE listed

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