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NVD / CVE Program· CNA Linux

CVE-2025-37984: crypto: ecdsa - Harden against integer overflows in DIV_ROUND_UP()

Noroxi assessment

Priority: Monitor (action score 22/100)

  • 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: 0.18% (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 6.6.99, 921b8167f10708e38080f84e195cdc68a7a561f1, b16510a530d1e6ab9683f04f8fb34f2e0f538275.

Low priority for now. Upgrade to Linux Linux 6.6.99, 921b8167f10708e38080f84e195cdc68a7a561f1, b16510a530d1e6ab9683f04f8fb34f2e0f538275 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: crypto: ecdsa - Harden against integer overflows in DIV_ROUND_UP() Herbert notes that DIV_ROUND_UP() may overflow unnecessarily if an ecdsa implementation's ->key_size() callback returns an unusually large value. Herbert instead suggests (for a division by 8): X / 8 + !!(X & 7) Based on this formula, introduce a generic DIV_ROUND_UP_POW2() macro and use it in lieu of DIV_ROUND_UP() for ->key_size() return values. Additionally, use the macro in ecc_digits_from_bytes(), whose "nbytes" parameter is a ->key_size() return value in some instances, or a user-specified ASN.1 length in the case of ecdsa_get_signature_rs().

MediumCVSS 5.5 · v3.1—No exploit Fix available
Published
May 20, 2025
Updated
Oct 15, 2026
EPSS
0.1% · 8th percentile

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 · 0.1%

CISA SSVC decision

Exploitation
none
Automatable
no
Technical impact
total

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
5.5
CNA · Linux
7.0
1.5 point gap

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

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

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  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

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When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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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.

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 kernel6.6.70 and later · before 6.6.99
  • linux linux kernel6.10 and later · before 6.12.39
  • linux linux kernel6.13 and later · before 6.14.5

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

    • 6.10affected
    • 55779f26eab9af12474a447001bd17070f055712 and later · before f02f0218be412cff1c844addf58e002071be298baffected · git
    • c6ab5c915da460c0397960af3c308386c3f3247b and later · before f2133b849ff273abddb6da622daddd8f6f6fa448affected · git
    • c6ab5c915da460c0397960af3c308386c3f3247b and later · before 921b8167f10708e38080f84e195cdc68a7a561f1affected · git
    • c6ab5c915da460c0397960af3c308386c3f3247b and later · before b16510a530d1e6ab9683f04f8fb34f2e0f538275affected · git
    • 6.6.70 and later · before 6.6.99affected · semver
    • before 6.10not affected · semver
    • 6.6.99 and later · up to and including 6.6.*not affected · semver
    • 6.12.39 and later · up to and including 6.12.*not affected · semver
    • 6.14.5 and later · up to and including 6.14.*not affected · semver

Package-level exposure

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

EcosystemPackageAffected rangeFix
Debian:13linuxbefore 6.12.41-16.12.41-1
Debian:14linuxbefore 6.16.3-16.16.3-1
openSUSE:Leap 15.6kernel-rtbefore 6.4.0-150600.10.49.16.4.0-150600.10.49.1
openSUSE:Leap 15.6kernel-rt_debugbefore 6.4.0-150600.10.49.16.4.0-150600.10.49.1
openSUSE:Leap 15.6kernel-source-rtbefore 6.4.0-150600.10.49.16.4.0-150600.10.49.1
openSUSE:Leap 15.6kernel-syms-rtbefore 6.4.0-150600.10.49.16.4.0-150600.10.49.1
SUSE:Linux Enterprise Live Patching 15 SP6kernel-livepatch-SLE15-SP6-RT_Update_14before 1-150600.1.5.11-150600.1.5.1
SUSE:Linux Enterprise Live Patching 15 SP7kernel-livepatch-SLE15-SP7-RT_Update_3before 1-150700.1.5.11-150700.1.5.1
SUSE:Linux Micro 6.0kernel-defaultbefore 6.4.0-32.16.4.0-32.1
SUSE:Linux Micro 6.0kernel-default-basebefore 6.4.0-32.1.21.106.4.0-32.1.21.10
SUSE:Linux Micro 6.0kernel-kvmsmallbefore 6.4.0-32.16.4.0-32.1
SUSE:Linux Micro 6.0kernel-rtbefore 6.4.0-35.16.4.0-35.1
SUSE:Linux Micro 6.0kernel-sourcebefore 6.4.0-32.16.4.0-32.1
SUSE:Linux Micro 6.0kernel-source-rtbefore 6.4.0-35.16.4.0-35.1
SUSE:Real Time Module 15 SP6kernel-rtbefore 6.4.0-150600.10.49.16.4.0-150600.10.49.1
SUSE:Real Time Module 15 SP6kernel-rt_debugbefore 6.4.0-150600.10.49.16.4.0-150600.10.49.1
SUSE:Real Time Module 15 SP6kernel-source-rtbefore 6.4.0-150600.10.49.16.4.0-150600.10.49.1
SUSE:Real Time Module 15 SP6kernel-syms-rtbefore 6.4.0-150600.10.49.16.4.0-150600.10.49.1
SUSE:Real Time Module 15 SP7kernel-rtbefore 6.4.0-150700.7.13.16.4.0-150700.7.13.1
SUSE:Real Time Module 15 SP7kernel-source-rtbefore 6.4.0-150700.7.13.16.4.0-150700.7.13.1
SUSE:Real Time Module 15 SP7kernel-syms-rtbefore 6.4.0-150700.7.13.16.4.0-150700.7.13.1

Same product

linux: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-31431crypto: algif_aead - Revert to operating out-of-placeKEV
    90Now
  • CVE-2022-0847A flaw was found in the way the "flags" member of the new pipe buffer structure was lacking proper initialization in copy_page_to_iter_pipe KEV
    89Now
  • CVE-2021-22555Heap Out-Of-Bounds Write in Netfilter IP6T_SO_SET_REPLACEKEV
    85Now

Published before and after this one in the same product

  • ← EarlierCVE-2025-37980May 20, 2025 · block: fix resource leak in blk_register_queue() error path
    22Monitor
  • ← EarlierCVE-2025-37981May 20, 2025 · scsi: smartpqi: Use is_kdump_kernel() to check for kdump
    31Monitor
  • Later →CVE-2025-37985May 20, 2025 · USB: wdm: close race between wdm_open and wdm_wwan_port_stop
    18Monitor

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 Linux6.6.99Vendor (CNA)
Linux Linux921b8167f10708e38080f84e195cdc68a7a561f1Vendor (CNA)
Linux Linuxb16510a530d1e6ab9683f04f8fb34f2e0f538275Vendor (CNA)
Linux Linuxf02f0218be412cff1c844addf58e002071be298bVendor (CNA)
Linux Linuxf2133b849ff273abddb6da622daddd8f6f6fa448Vendor (CNA)
debian:linux6.12.41-1 · Debian:13Package registry (OSV)
opensuse:kernel-rt6.4.0-150600.10.49.1 · openSUSE:Leap 15.6Package registry (OSV)
opensuse:kernel-rt_debug6.4.0-150600.10.49.1 · openSUSE:Leap 15.6Package registry (OSV)
opensuse:kernel-source-rt6.4.0-150600.10.49.1 · openSUSE:Leap 15.6Package registry (OSV)
opensuse:kernel-syms-rt6.4.0-150600.10.49.1 · openSUSE:Leap 15.6Package registry (OSV)
suse:kernel-default6.4.0-32.1 · SUSE:Linux Micro 6.0Package registry (OSV)
suse:kernel-default-base6.4.0-32.1.21.10 · SUSE:Linux Micro 6.0Package registry (OSV)
suse:kernel-kvmsmall6.4.0-32.1 · SUSE:Linux Micro 6.0Package registry (OSV)
suse:kernel-livepatch-SLE15-SP6-RT_Update_141-150600.1.5.1 · SUSE:Linux Enterprise Live Patching 15 SP6Package registry (OSV)
suse:kernel-livepatch-SLE15-SP7-RT_Update_31-150700.1.5.1 · SUSE:Linux Enterprise Live Patching 15 SP7Package registry (OSV)
suse:kernel-rt6.4.0-150600.10.49.1 · SUSE:Real Time Module 15 SP6Package registry (OSV)
suse:kernel-rt6.4.0-150700.7.13.1 · SUSE:Real Time Module 15 SP7Package registry (OSV)
suse:kernel-rt_debug6.4.0-150600.10.49.1 · SUSE:Real Time Module 15 SP6Package registry (OSV)
suse:kernel-source6.4.0-32.1 · SUSE:Linux Micro 6.0Package registry (OSV)
suse:kernel-source-rt6.4.0-150600.10.49.1 · SUSE:Real Time Module 15 SP6Package registry (OSV)
suse:kernel-source-rt6.4.0-150700.7.13.1 · SUSE:Real Time Module 15 SP7Package registry (OSV)
suse:kernel-syms-rt6.4.0-150600.10.49.1 · SUSE:Real Time Module 15 SP6Package registry (OSV)
suse:kernel-syms-rt6.4.0-150700.7.13.1 · SUSE:Real Time Module 15 SP7Package registry (OSV)

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.

No history yet (it accumulates with the daily EPSS job).

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-2026-31633339 days apartrxrpc: Fix integer overflow in rxgk_verify_response()
    39Monitor
  • CVE-2026-31649339 days apartnet: stmmac: fix integer underflow in chain mode
    39Monitor
  • CVE-2026-31659339 days apartbatman-adv: reject oversized global TT response buffers
    39Monitor
  • CVE-2026-43341353 days apartnet/ipv6: ioam6: prevent schema length wraparound in trace fill
    39Monitor
  • CVE-2026-46039372 days apartrxgk: Fix potential integer overflow in length check
    39Monitor
  • CVE-2026-46325385 days apartRDMA/rxe: Fix iova-to-va conversion for MR page sizes != PAGE_SIZE
    39Monitor

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)

CWE-190 · Integer Overflow or Wraparound

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.

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 (3 more)

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

All records