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NVD / CVE Program· CNA Linux

CVE-2025-40019: crypto: essiv - Check ssize for decryption and in-place encryption

Noroxi assessment

Priority: Monitor (action score 0/100)

  • Public proof-of-concept code exists (GitHub); there is no record of exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.28% (FIRST EPSS).
  • Fixed version: Linux Linux 248ff2797ff52a8cbf86507f9583437443bf7685, 29294dd6f1e7acf527255fb136ffde6602c3a129, 6bb73db6948c2de23e407fe1b7ef94bf02b7529f; azl3 kernel 6.6.112.1-2 on Azure Linux 3.0 6.6.117.1-1.

Low priority for now. Upgrade to Linux Linux 248ff2797ff52a8cbf86507f9583437443bf7685, 29294dd6f1e7acf527255fb136ffde6602c3a129, 6bb73db6948c2de23e407fe1b7ef94bf02b7529f; azl3 kernel 6.6.112.1-2 on Azure Linux 3.0 6.6.117.1-1 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: crypto: essiv - Check ssize for decryption and in-place encryption Move the ssize check to the start in essiv_aead_crypt so that it's also checked for decryption and in-place encryption.

—Proof of concept Fix available
Published
Oct 24, 2025
Updated
Oct 19, 2026
EPSS
0.2% · 21th percentile
CWE
—

Report tools

JSON

Action score

0

Monitor

Low priority for now.

CVSS
0 / 40 · —
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.2%

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • Proof of concept exists, no weaponized module
  • A fix has been released

If any of these changes, we'll tell you in the daily email digest.

Follow CVE-2025-40019

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.

—

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

    • 5.4affected
    • be1eb7f78aa8fbe34779c56c266ccd0364604e71 and later · before 29294dd6f1e7acf527255fb136ffde6602c3a129affected · git
    • be1eb7f78aa8fbe34779c56c266ccd0364604e71 and later · before 71f03f8f72d9c70ffba76980e78b38c180e61589affected · git
    • be1eb7f78aa8fbe34779c56c266ccd0364604e71 and later · before df58651968f82344a0ed2afdafd20ecfc55ff548affected · git
    • be1eb7f78aa8fbe34779c56c266ccd0364604e71 and later · before 248ff2797ff52a8cbf86507f9583437443bf7685affected · git
    • be1eb7f78aa8fbe34779c56c266ccd0364604e71 and later · before f37e7860dc5e94c70b4a3e38a5809181310ea9acaffected · git
    • be1eb7f78aa8fbe34779c56c266ccd0364604e71 and later · before dc4c854a5e7453c465fa73b153eba4ef2a240abeaffected · git
    • be1eb7f78aa8fbe34779c56c266ccd0364604e71 and later · before da7afb01ba05577ba3629f7f4824205550644986affected · git
    • be1eb7f78aa8fbe34779c56c266ccd0364604e71 and later · before 6bb73db6948c2de23e407fe1b7ef94bf02b7529faffected · git
    • before 5.4not affected · semver

Package-level exposure

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

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 6.1.158-16.1.158-1
Debian:13linuxbefore 6.12.57-16.12.57-1
Debian:14linuxbefore 6.17.6-16.17.6-1
openSUSE:Tumbleweedkernel-sourcebefore 6.17.7-1.16.17.7-1.1

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-2023-53733Oct 24, 2025 · net: sched: cls_u32: Undo tcf_bind_filter if u32_replace_hw_knode
    31Monitor
  • ← EarlierCVE-2025-40018Oct 24, 2025 · ipvs: Defer ip_vs_ftp unregister during netns cleanup
    31Monitor
  • Later →CVE-2025-40020Oct 24, 2025 · can: peak_usb: fix shift-out-of-bounds issue
    0Monitor

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 Linux248ff2797ff52a8cbf86507f9583437443bf7685Vendor (CNA)
Linux Linux29294dd6f1e7acf527255fb136ffde6602c3a129Vendor (CNA)
Linux Linux6bb73db6948c2de23e407fe1b7ef94bf02b7529fVendor (CNA)
Linux Linux71f03f8f72d9c70ffba76980e78b38c180e61589Vendor (CNA)
Linux Linuxda7afb01ba05577ba3629f7f4824205550644986Vendor (CNA)
Linux Linuxdc4c854a5e7453c465fa73b153eba4ef2a240abeVendor (CNA)
Linux Linuxdf58651968f82344a0ed2afdafd20ecfc55ff548Vendor (CNA)
Linux Linuxf37e7860dc5e94c70b4a3e38a5809181310ea9acVendor (CNA)
azl3 kernel 6.6.112.1-2 on Azure Linux 3.06.6.117.1-1 · CBL-Mariner ReleasesMicrosoft (MSRC)
debian:linux6.1.158-1 · Debian:12Package registry (OSV)
opensuse:kernel-source6.17.7-1.1 · openSUSE:TumbleweedPackage registry (OSV)

Exploit status

Proof of concept available

A public proof of concept or detection signature exists. Exploit knowledge is out there; don't delay patching.

Evidence

  • Proof-of-concept repository on GitHub ×2

Noroxi does not host or link to exploit code. Metasploit module names and Nuclei template ids are shown (names, not code); Exploit-DB entries and PoC repositories are given as counts only.

Public exploit evidence
SourceKindDate
Proof-of-concept repository on GitHubstars:02025-12-30
Proof-of-concept repository on GitHubstars:02026-01-02

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.

  1. Published
  2. First PoC+66 d
  3. TodayNov 10, 2026+382 d

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.

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

No CVSS vector for this record, so attack conditions can't be derived.

Weakness class (CWE)

—

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.

Change log

  1. Fix✗ → ✓

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References

Show all references (7 more)

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

All records