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NVD / CVE Program· CNA Linux

CVE-2026-68145: iomap: fix out-of-bounds bitmap_set() with zero-length range

Noroxi assessment

Priority: Monitor (action score 31/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.13% (FIRST EPSS).
  • 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.
  • Fixed version: Linux Linux 48829622212f6b8f49155889aecc818ba28ba680, 7037e7bdcd26f46c080b8ce307dee5cb471c4b7c, 9c7d8f7c8994c790fca501dc45ce66e7356cbe05; azl3 kernel 6.6.152.1-1 on Azure Linux 3.0 6.6.157.1-1.
  • Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. Upgrade to Linux Linux 48829622212f6b8f49155889aecc818ba28ba680, 7037e7bdcd26f46c080b8ce307dee5cb471c4b7c, 9c7d8f7c8994c790fca501dc45ce66e7356cbe05; azl3 kernel 6.6.152.1-1 on Azure Linux 3.0 6.6.157.1-1 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

In the Linux kernel, the following vulnerability has been resolved: iomap: fix out-of-bounds bitmap_set() with zero-length range ifs_set_range_dirty() and ifs_set_range_uptodate() compute last_blk as (off + len - 1) >> i_blkbits. When off is 0 and len is 0, the unsigned subtraction underflows to SIZE_MAX, producing a huge last_blk and nr_blks value that causes bitmap_set() to write far beyond the ifs->state allocation. Regarding ifs_set_range_uptodate(), it is temporarily safe because len cannot be passed in as 0. However, for ifs_set_range_dirty() this is reachable from __iomap_write_end(): when copy_folio_from_iter_atomic() returns 0 (e.g. user buffer fault) and the folio is already uptodate, the guard at the top of __iomap_write_end() does not trigger because !folio_test_uptodate() is false, and iomap_set_range_dirty() is called with copied == 0. Add a !len guard to both functions before the computation, so that a zero-length range is a no-op.

HighCVSS 7.8 · v3.1—No exploit Fix available
Published
Aug 10, 2026
Updated
Oct 19, 2026
EPSS
0.1% · 3th percentile

Report tools

JSON

Action score

31

Monitor

Low priority for now.

CVSS
31 / 40 · 7.8 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.1%

CISA SSVC decision

Exploitation
none
Automatable
no
Technical impact
total

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
—
CNA · Linux
7.8
NVD has not scored this yet; the score shown is the CNA’s.

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

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Noroxi analysis

What does it mean in your environment?

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

—

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
    • 4ce02c67972211be488408c275c8fbf19faf29b3 and later · before 48829622212f6b8f49155889aecc818ba28ba680affected · git
    • 4ce02c67972211be488408c275c8fbf19faf29b3 and later · before fb4fad9105c88b1d82f1b3c39e3b6abea8249af6affected · git
    • 4ce02c67972211be488408c275c8fbf19faf29b3 and later · before 7037e7bdcd26f46c080b8ce307dee5cb471c4b7caffected · git
    • 4ce02c67972211be488408c275c8fbf19faf29b3 and later · before c5b6a48a8a716a7730e39af1cad083dc4ec955ceaffected · git
    • 4ce02c67972211be488408c275c8fbf19faf29b3 and later · before 9c7d8f7c8994c790fca501dc45ce66e7356cbe05affected · git
    • before 6.6not affected · semver
    • 6.6.153 and later · up to and including 6.6.*not affected · semver
    • 6.12.101 and later · up to and including 6.12.*not affected · semver
    • 6.18.42 and later · up to and including 6.18.*not affected · semver

Package-level exposure

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

EcosystemPackageAffected rangeFix
AlmaLinux:10kernelbefore 6.12.0-211.51.1.el10_26.12.0-211.51.1.el10_2
AlmaLinux:10kernel-64kbefore 6.12.0-211.51.1.el10_26.12.0-211.51.1.el10_2
AlmaLinux:10kernel-64k-corebefore 6.12.0-211.51.1.el10_26.12.0-211.51.1.el10_2
AlmaLinux:10kernel-64k-debugbefore 6.12.0-211.51.1.el10_26.12.0-211.51.1.el10_2
AlmaLinux:10kernel-64k-debug-corebefore 6.12.0-211.51.1.el10_26.12.0-211.51.1.el10_2
AlmaLinux:10kernel-64k-debug-develbefore 6.12.0-211.51.1.el10_26.12.0-211.51.1.el10_2
AlmaLinux:10kernel-64k-debug-devel-matchedbefore 6.12.0-211.51.1.el10_26.12.0-211.51.1.el10_2
AlmaLinux:10kernel-64k-debug-modulesbefore 6.12.0-211.51.1.el10_26.12.0-211.51.1.el10_2
AlmaLinux:10kernel-64k-debug-modules-corebefore 6.12.0-211.51.1.el10_26.12.0-211.51.1.el10_2
AlmaLinux:10kernel-64k-debug-modules-extrabefore 6.12.0-211.51.1.el10_26.12.0-211.51.1.el10_2
AlmaLinux:10kernel-64k-develbefore 6.12.0-211.51.1.el10_26.12.0-211.51.1.el10_2
AlmaLinux:10kernel-64k-devel-matchedbefore 6.12.0-211.51.1.el10_26.12.0-211.51.1.el10_2
AlmaLinux:10kernel-64k-modulesbefore 6.12.0-211.51.1.el10_26.12.0-211.51.1.el10_2
AlmaLinux:10kernel-64k-modules-corebefore 6.12.0-211.51.1.el10_26.12.0-211.51.1.el10_2
AlmaLinux:10kernel-64k-modules-extrabefore 6.12.0-211.51.1.el10_26.12.0-211.51.1.el10_2
AlmaLinux:10kernel-abi-stablelistsbefore 6.12.0-211.51.1.el10_26.12.0-211.51.1.el10_2
AlmaLinux:10kernel-corebefore 6.12.0-211.51.1.el10_26.12.0-211.51.1.el10_2
AlmaLinux:10kernel-cross-headersbefore 6.12.0-211.51.1.el10_26.12.0-211.51.1.el10_2
AlmaLinux:10kernel-debugbefore 6.12.0-211.51.1.el10_26.12.0-211.51.1.el10_2
AlmaLinux:10kernel-debug-corebefore 6.12.0-211.51.1.el10_26.12.0-211.51.1.el10_2
AlmaLinux:10kernel-debug-develbefore 6.12.0-211.51.1.el10_26.12.0-211.51.1.el10_2
AlmaLinux:10kernel-debug-devel-matchedbefore 6.12.0-211.51.1.el10_26.12.0-211.51.1.el10_2
AlmaLinux:10kernel-debug-modulesbefore 6.12.0-211.51.1.el10_26.12.0-211.51.1.el10_2
AlmaLinux:10kernel-debug-modules-corebefore 6.12.0-211.51.1.el10_26.12.0-211.51.1.el10_2

+96

Same product

linux: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-74705udp: fix potential use-after-free in tunnel segmentation
    40Plan
  • CVE-2026-74612veth: fix skb length accounting after XDP frag adjustment
    40Plan
  • CVE-2026-74475vxlan: use neigh_ha_snapshot() in route_shortcircuit()
    40Plan

Published before and after this one in the same product

  • ← EarlierCVE-2026-68143Aug 10, 2026 · net: slip: serialize receive against buffer reallocation
    31Monitor
  • ← EarlierCVE-2026-68144Aug 10, 2026 · phonet: pep: fix use-after-free in pep_get_sb()
    39Monitor
  • Later →CVE-2026-68148Aug 10, 2026 · fscrypt: Add missing superblock check in find_or_insert_direct_key()
    31Monitor

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 Linux48829622212f6b8f49155889aecc818ba28ba680Vendor (CNA)
Linux Linux7037e7bdcd26f46c080b8ce307dee5cb471c4b7cVendor (CNA)
Linux Linux9c7d8f7c8994c790fca501dc45ce66e7356cbe05Vendor (CNA)
Linux Linuxc5b6a48a8a716a7730e39af1cad083dc4ec955ceVendor (CNA)
Linux Linuxfb4fad9105c88b1d82f1b3c39e3b6abea8249af6Vendor (CNA)
azl3 kernel 6.6.152.1-1 on Azure Linux 3.06.6.157.1-1 · Release NotesMicrosoft (MSRC)
almalinux:kernel6.12.0-211.51.1.el10_2 · AlmaLinux:10Package registry (OSV)
almalinux:kernel-64k6.12.0-211.51.1.el10_2 · AlmaLinux:10Package registry (OSV)
almalinux:kernel-64k-core6.12.0-211.51.1.el10_2 · AlmaLinux:10Package registry (OSV)
almalinux:kernel-64k-debug6.12.0-211.51.1.el10_2 · AlmaLinux:10Package registry (OSV)
almalinux:kernel-64k-debug-core6.12.0-211.51.1.el10_2 · AlmaLinux:10Package registry (OSV)
almalinux:kernel-64k-debug-devel6.12.0-211.51.1.el10_2 · AlmaLinux:10Package registry (OSV)
almalinux:kernel-64k-debug-devel-matched6.12.0-211.51.1.el10_2 · AlmaLinux:10Package registry (OSV)
almalinux:kernel-64k-debug-modules6.12.0-211.51.1.el10_2 · AlmaLinux:10Package registry (OSV)
almalinux:kernel-64k-debug-modules-core6.12.0-211.51.1.el10_2 · AlmaLinux:10Package registry (OSV)
almalinux:kernel-64k-debug-modules-extra6.12.0-211.51.1.el10_2 · AlmaLinux:10Package registry (OSV)
almalinux:kernel-64k-devel6.12.0-211.51.1.el10_2 · AlmaLinux:10Package registry (OSV)
almalinux:kernel-64k-devel-matched6.12.0-211.51.1.el10_2 · AlmaLinux:10Package registry (OSV)
debian:linux6.12.101-1 · Debian:13Package registry (OSV)
debian:linux-6.126.12.101-1~deb12u1 · Debian:12Package registry (OSV)
red hat:kernel-64k-debug-debuginfo0:6.12.0-211.51.1.el10_2 · Red Hat:enterprise_linux:10.2Package registry (OSV)
red hat:kernel-64k-debug-devel0:6.12.0-211.51.1.el10_2 · Red Hat:enterprise_linux:10.2Package registry (OSV)
red hat:kernel-64k-debug-devel-matched0:6.12.0-211.51.1.el10_2 · Red Hat:enterprise_linux:10.2Package registry (OSV)
red hat:kernel-64k-debuginfo0:6.12.0-211.51.1.el10_2 · Red Hat:enterprise_linux:10.2Package registry (OSV)
red hat:kernel-64k-devel0:6.12.0-211.51.1.el10_2 · Red Hat:enterprise_linux:10.2Package registry (OSV)
red hat:kernel-64k-devel-matched0:6.12.0-211.51.1.el10_2 · Red Hat:enterprise_linux:10.2Package registry (OSV)
red hat:kernel-debug-debuginfo0:6.12.0-211.51.1.el10_2 · Red Hat:enterprise_linux:10.2Package registry (OSV)
red hat:kernel-debug-devel0:6.12.0-211.51.1.el10_2 · Red Hat:enterprise_linux:10.2Package registry (OSV)
red hat:kernel-debug-devel-matched0:6.12.0-211.51.1.el10_2 · Red Hat:enterprise_linux:10.2Package registry (OSV)
red hat:kernel-debuginfo0:6.12.0-211.51.1.el10_2 · Red Hat:enterprise_linux:10.2Package registry (OSV)

+3

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.

Credits

All researchers

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.

  • CVE-2026-681580 days apartlibceph: Fix multiplication overflow in decode_new_up_state_weight()
    39Monitor
  • CVE-2026-720145 days apartdrbd: reject data replies with an out-of-range payload size
    39Monitor
  • CVE-2026-6398422 days apartipv6: rpl: fix hdrlen overflow in ipv6_rpl_srh_decompress()
    39Monitor
  • CVE-2025-68794209 days apartiomap: adjust read range correctly for non-block-aligned positions
    39Monitor
  • CVE-2026-681080 days apartdrm/amdgpu/vce: fix integer overflow in image size
    35Monitor
  • CVE-2026-681250 days apartmac802154: llsec: reject frames shorter than the authentication tag
    35Monitor

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).

National notice (Türkiye Cybersecurity Directorate / USOM)

Official security notices citing this record; remediation advice is on the agency's page.

All national notices →

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

Weakness class (CWE)

CWE-190 · Integer Overflow or Wraparound

CVSS vector

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

nvd-secondary

Attack context

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

ATT&CK techniques

—

Change log

  1. SSVC exploitation— → none
  2. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Show all references (4 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records