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CVE-2025-71072· NVD / CVE Program· CNA Linux

shmem: fix recovery on rename failures

In the Linux kernel, the following vulnerability has been resolved: shmem: fix recovery on rename failures maple_tree insertions can fail if we are seriously short on memory; simple_offset_rename() does not recover well if it runs into that. The same goes for simple_offset_rename_exchange(). Moreover, shmem_whiteout() expects that if it succeeds, the caller will progress to d_move(), i.e. that shmem_rename2() won't fail past the successful call of shmem_whiteout(). Not hard to fix, fortunately - mtree_store() can't fail if the index we are trying to store into is already present in the tree as a singleton. For simple_offset_rename_exchange() that's enough - we just need to be careful about the order of operations. For simple_offset_rename() solution is to preinsert the target into the tree for new_dir; the rest can be done without any potentially failing operations. That preinsertion has to be done in shmem_rename2() rather than in simple_offset_rename() itself - otherwise we'd need to deal with the possibility of failure after successful shmem_whiteout().

MediumCVSS 5.5 · v3.1—No exploit Fix available
Published
Jan 13, 2026
Updated
Aug 5, 2026
EPSS
0.3% · 19th percentile
CWE
—
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Report tools

JSON

Action score

22

Monitor

Low priority for now.

CVSS
22 / 40 · 5.5 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.3%

CNA vs NVD score

NVD
5.5
CNA · Linux
8.2
2.7 point gap

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

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

Affected systems

VendorProduct
linuxlinux kernel

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • linux linux kernel6.6.1 and later · before 6.12.64
  • linux linux kernel6.13 and later · before 6.18.3
  • linux linux kernel6.19
  • linux linux kernel6.6

Versions reported by the vendor

Affected version ranges reported by the assigning authority (Linux). Independent of NVD's CPE analysis and usually ahead of it.

  • Linux Linux

    • 6.6affected
    • a2e459555c5f9da3e619b7e47a63f98574dc75f1 and later · before 4b0fe71fb3965d0db83cdfc2f4fe0b3227d70113affected · git
    • a2e459555c5f9da3e619b7e47a63f98574dc75f1 and later · before 4642686699a46718d7f2fb5acd1e9d866a9d9ccaaffected · git
    • a2e459555c5f9da3e619b7e47a63f98574dc75f1 and later · before e1b4c6a58304fd490124cc2b454d80edc786665caffected · git
    • before 6.6not affected · semver
    • 6.12.64 and later · up to and including 6.12.*not affected · semver
    • 6.18.3 and later · up to and including 6.18.*not affected · semver
    • 6.19 and laternot affected · original_commit_for_fix

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
AlmaLinux:10kernelbefore 6.12.0-211.46.1.el10_26.12.0-211.46.1.el10_2
AlmaLinux:10kernel-64kbefore 6.12.0-211.46.1.el10_26.12.0-211.46.1.el10_2
AlmaLinux:10kernel-64k-corebefore 6.12.0-211.46.1.el10_26.12.0-211.46.1.el10_2
AlmaLinux:10kernel-64k-debugbefore 6.12.0-211.46.1.el10_26.12.0-211.46.1.el10_2
AlmaLinux:10kernel-64k-debug-corebefore 6.12.0-211.46.1.el10_26.12.0-211.46.1.el10_2
AlmaLinux:10kernel-64k-debug-develbefore 6.12.0-211.46.1.el10_26.12.0-211.46.1.el10_2
AlmaLinux:10kernel-64k-debug-devel-matchedbefore 6.12.0-211.46.1.el10_26.12.0-211.46.1.el10_2
AlmaLinux:10kernel-64k-debug-modulesbefore 6.12.0-211.46.1.el10_26.12.0-211.46.1.el10_2
AlmaLinux:10kernel-64k-debug-modules-corebefore 6.12.0-211.46.1.el10_26.12.0-211.46.1.el10_2
AlmaLinux:10kernel-64k-debug-modules-extrabefore 6.12.0-211.46.1.el10_26.12.0-211.46.1.el10_2
AlmaLinux:10kernel-64k-develbefore 6.12.0-211.46.1.el10_26.12.0-211.46.1.el10_2
AlmaLinux:10kernel-64k-devel-matchedbefore 6.12.0-211.46.1.el10_26.12.0-211.46.1.el10_2
AlmaLinux:10kernel-64k-modulesbefore 6.12.0-211.46.1.el10_26.12.0-211.46.1.el10_2
AlmaLinux:10kernel-64k-modules-corebefore 6.12.0-211.46.1.el10_26.12.0-211.46.1.el10_2
AlmaLinux:10kernel-64k-modules-extrabefore 6.12.0-211.46.1.el10_26.12.0-211.46.1.el10_2
AlmaLinux:10kernel-abi-stablelistsbefore 6.12.0-211.46.1.el10_26.12.0-211.46.1.el10_2
AlmaLinux:10kernel-corebefore 6.12.0-211.46.1.el10_26.12.0-211.46.1.el10_2
AlmaLinux:10kernel-cross-headersbefore 6.12.0-211.46.1.el10_26.12.0-211.46.1.el10_2
AlmaLinux:10kernel-debugbefore 6.12.0-211.46.1.el10_26.12.0-211.46.1.el10_2
AlmaLinux:10kernel-debug-corebefore 6.12.0-211.46.1.el10_26.12.0-211.46.1.el10_2
AlmaLinux:10kernel-debug-develbefore 6.12.0-211.46.1.el10_26.12.0-211.46.1.el10_2
AlmaLinux:10kernel-debug-devel-matchedbefore 6.12.0-211.46.1.el10_26.12.0-211.46.1.el10_2
AlmaLinux:10kernel-debug-modulesbefore 6.12.0-211.46.1.el10_26.12.0-211.46.1.el10_2
AlmaLinux:10kernel-debug-modules-corebefore 6.12.0-211.46.1.el10_26.12.0-211.46.1.el10_2

+96

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Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
Linux Linux4642686699a46718d7f2fb5acd1e9d866a9d9ccaVendor (CNA)
Linux Linux4b0fe71fb3965d0db83cdfc2f4fe0b3227d70113Vendor (CNA)
Linux Linuxe1b4c6a58304fd490124cc2b454d80edc786665cVendor (CNA)
azl3 kernel 6.6.150.1-1 on Azure Linux 3.0—Microsoft (MSRC)
azl3 kernel 6.6.152.1-1 on Azure Linux 3.0Release NotesMicrosoft (MSRC)
azl3 kernel 6.6.157.1-1 on Azure Linux 3.0Release NotesMicrosoft (MSRC)
almalinux:kernel6.12.0-211.46.1.el10_2 · AlmaLinux:10Package registry (OSV)
almalinux:kernel-64k6.12.0-211.46.1.el10_2 · AlmaLinux:10Package registry (OSV)
almalinux:kernel-64k-core6.12.0-211.46.1.el10_2 · AlmaLinux:10Package registry (OSV)
almalinux:kernel-64k-debug6.12.0-211.46.1.el10_2 · AlmaLinux:10Package registry (OSV)
almalinux:kernel-64k-debug-core6.12.0-211.46.1.el10_2 · AlmaLinux:10Package registry (OSV)
almalinux:kernel-64k-debug-devel6.12.0-211.46.1.el10_2 · AlmaLinux:10Package registry (OSV)
almalinux:kernel-64k-debug-devel-matched6.12.0-211.46.1.el10_2 · AlmaLinux:10Package registry (OSV)
almalinux:kernel-64k-debug-modules6.12.0-211.46.1.el10_2 · AlmaLinux:10Package registry (OSV)
almalinux:kernel-64k-debug-modules-core6.12.0-211.46.1.el10_2 · AlmaLinux:10Package registry (OSV)
almalinux:kernel-64k-debug-modules-extra6.12.0-211.46.1.el10_2 · AlmaLinux:10Package registry (OSV)
almalinux:kernel-64k-devel6.12.0-211.46.1.el10_2 · AlmaLinux:10Package registry (OSV)
almalinux:kernel-64k-devel-matched6.12.0-211.46.1.el10_2 · AlmaLinux:10Package registry (OSV)
debian:linux6.12.69-1 · Debian:13Package registry (OSV)
red hat:kernel-64k-debug-debuginfo0:6.12.0-211.46.1.el10_2 · Red Hat:enterprise_linux:10.2Package registry (OSV)
red hat:kernel-64k-debug-devel0:6.12.0-211.46.1.el10_2 · Red Hat:enterprise_linux:10.2Package registry (OSV)
red hat:kernel-64k-debug-devel-matched0:6.12.0-211.46.1.el10_2 · Red Hat:enterprise_linux:10.2Package registry (OSV)
red hat:kernel-64k-debuginfo0:6.12.0-211.46.1.el10_2 · Red Hat:enterprise_linux:10.2Package registry (OSV)
red hat:kernel-64k-devel0:6.12.0-211.46.1.el10_2 · Red Hat:enterprise_linux:10.2Package registry (OSV)
red hat:kernel-64k-devel-matched0:6.12.0-211.46.1.el10_2 · Red Hat:enterprise_linux:10.2Package registry (OSV)
red hat:kernel-debug-debuginfo0:6.12.0-211.46.1.el10_2 · Red Hat:enterprise_linux:10.2Package registry (OSV)
red hat:kernel-debug-devel0:6.12.0-211.46.1.el10_2 · Red Hat:enterprise_linux:10.2Package registry (OSV)
red hat:kernel-debug-devel-matched0:6.12.0-211.46.1.el10_2 · Red Hat:enterprise_linux:10.2Package registry (OSV)
red hat:kernel-debuginfo0:6.12.0-211.46.1.el10_2 · Red Hat:enterprise_linux:10.2Package registry (OSV)
red hat:kernel-debuginfo-common-aarch640:6.12.0-211.46.1.el10_2 · Red Hat:enterprise_linux:10.2Package registry (OSV)

+2

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

  • Someone with local access to the system can trigger it.
  • A low-privileged account is enough.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
none
Integrity
none
Availability
high · the service can be disrupted
Attack vector
Local
Attack complexity
Low
Privileges required
Low
User interaction
None
Scope
Unchanged
Confidentiality impact
None
Integrity impact
None
Availability impact
High

Weakness class (CWE)

—

CVSS vector

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

nvd-primary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

Noroxi analysis

No Noroxi analysis for this record yet

We don't hand-write analysis for all 385,000+ vulnerabilities; that wouldn't be honest. For notable, high-impact vulnerabilities our team writes the mechanism, detection and remediation steps.

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Change log

  1. Fix✗ → ✓

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References

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