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NVD / CVE Program· CNA Linux

CVE-2025-40022: crypto: af_alg - Fix incorrect boolean values in af_alg_ctx

Noroxi assessment

Priority: Monitor (action score 0/100)

  • 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: 0.23% (FIRST EPSS).
  • Fixed version: Linux Linux 316b090c2fee964c307a634fecc7df269664b158, 3a21698ace915a445bce2d0dcfc84b6d2199baf7, 54506c6335690f4ef1b9f154e34f5a604c72c1ed.

Low priority for now. Upgrade to Linux Linux 316b090c2fee964c307a634fecc7df269664b158, 3a21698ace915a445bce2d0dcfc84b6d2199baf7, 54506c6335690f4ef1b9f154e34f5a604c72c1ed 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: af_alg - Fix incorrect boolean values in af_alg_ctx Commit 1b34cbbf4f01 ("crypto: af_alg - Disallow concurrent writes in af_alg_sendmsg") changed some fields from bool to 1-bit bitfields of type u32. However, some assignments to these fields, specifically 'more' and 'merge', assign values greater than 1. These relied on C's implicit conversion to bool, such that zero becomes false and nonzero becomes true. With a 1-bit bitfields of type u32 instead, mod 2 of the value is taken instead, resulting in 0 being assigned in some cases when 1 was intended. Fix this by restoring the bool type.

—No exploit Fix available
Published
Oct 24, 2025
Updated
Oct 19, 2026
EPSS
0.2% · 14th 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%

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  • A fix has been released

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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

    • 0f28c4adbc4a97437874c9b669fd7958a8c6d6ce and later · before 3a21698ace915a445bce2d0dcfc84b6d2199baf7affected · git
    • e4c1ec11132ec466f7362a95f36a506ce4dc08c9 and later · before d382d6daf0184490f366562469a5673f65ee2662affected · git
    • 1f323a48e9b5ebfe6dc7d130fdf5c3c0e92a07c8 and later · before 54506c6335690f4ef1b9f154e34f5a604c72c1edaffected · git
    • 7c4491b5644e3a3708f3dbd7591be0a570135b84 and later · before 8703940bd30b5ad94408d28d7192db2491cd3592affected · git
    • 9aee87da5572b3a14075f501752e209801160d3d and later · before 316b090c2fee964c307a634fecc7df269664b158affected · git
    • 45bcf60fe49b37daab1acee57b27211ad1574042 and later · before fbe96bd25423e61273d8831e995260b429d850b6affected · git
    • 1b34cbbf4f011a121ef7b2d7d6e6920a036d5285 and later · before d0ca0df179c4b21e2a6c4a4fb637aa8fa14575cbaffected · git
    • 6.1.154 and later · before 6.1.155affected · semver
    • 6.6.108 and later · before 6.6.109affected · semver
    • 6.12.49 and later · before 6.12.50affected · 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 6.16.10-16.16.10-1
openSUSE:Leap 16.0dtb-aarch64before 6.12.0-160000.37.16.12.0-160000.37.1
openSUSE:Leap 16.0kernel-64kbbefore 6.12.0-160000.37.16.12.0-160000.37.1
openSUSE:Leap 16.0kernel-azurebefore 6.12.0-160000.37.16.12.0-160000.37.1
openSUSE:Leap 16.0kernel-defaultbefore 6.12.0-160000.37.16.12.0-160000.37.1
openSUSE:Leap 16.0kernel-default-basebefore 6.12.0-160000.37.1.160000.2.196.12.0-160000.37.1.160000.2.19
openSUSE:Leap 16.0kernel-docsbefore 6.12.0-160000.37.16.12.0-160000.37.1
openSUSE:Leap 16.0kernel-kvmsmallbefore 6.12.0-160000.37.16.12.0-160000.37.1
openSUSE:Leap 16.0kernel-obs-buildbefore 6.12.0-160000.37.16.12.0-160000.37.1
openSUSE:Leap 16.0kernel-obs-qabefore 6.12.0-160000.37.16.12.0-160000.37.1
openSUSE:Leap 16.0kernel-rtbefore 6.12.0-160000.37.16.12.0-160000.37.1
openSUSE:Leap 16.0kernel-sourcebefore 6.12.0-160000.37.16.12.0-160000.37.1
openSUSE:Leap 16.0kernel-symsbefore 6.12.0-160000.37.16.12.0-160000.37.1
openSUSE:Leap 16.0kernel-zfcpdumpbefore 6.12.0-160000.37.16.12.0-160000.37.1
SUSE:Linux Enterprise High Performance Computing 15 SP4-ESPOSkernel-64kbbefore 5.14.21-150400.24.243.15.14.21-150400.24.243.1
SUSE:Linux Enterprise High Performance Computing 15 SP4-ESPOSkernel-docsbefore 5.14.21-150400.24.243.15.14.21-150400.24.243.1
SUSE:Linux Enterprise High Performance Computing 15 SP4-ESPOSkernel-obs-buildbefore 5.14.21-150400.24.243.15.14.21-150400.24.243.1
SUSE:Linux Enterprise High Performance Computing 15 SP4-ESPOSkernel-symsbefore 5.14.21-150400.24.243.15.14.21-150400.24.243.1
SUSE:Linux Enterprise High Performance Computing 15 SP5-ESPOSkernel-64kbbefore 5.14.21-150500.55.192.25.14.21-150500.55.192.2
SUSE:Linux Enterprise High Performance Computing 15 SP5-ESPOSkernel-docsbefore 5.14.21-150500.55.192.15.14.21-150500.55.192.1
SUSE:Linux Enterprise High Performance Computing 15 SP5-ESPOSkernel-obs-buildbefore 5.14.21-150500.55.192.25.14.21-150500.55.192.2
SUSE:Linux Enterprise High Performance Computing 15 SP5-ESPOSkernel-symsbefore 5.14.21-150500.55.192.15.14.21-150500.55.192.1

+60

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-2025-40020Oct 24, 2025 · can: peak_usb: fix shift-out-of-bounds issue
    0Monitor
  • ← EarlierCVE-2025-40021Oct 24, 2025 · tracing: dynevent: Add a missing lockdown check on dynevent
    0Monitor
  • Later →CVE-2025-40023Oct 24, 2025 · drm/xe/vf: Don't expose sysfs attributes not applicable for VFs
    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 Linux316b090c2fee964c307a634fecc7df269664b158Vendor (CNA)
Linux Linux3a21698ace915a445bce2d0dcfc84b6d2199baf7Vendor (CNA)
Linux Linux54506c6335690f4ef1b9f154e34f5a604c72c1edVendor (CNA)
Linux Linux6.1.155Vendor (CNA)
Linux Linux6.12.50Vendor (CNA)
Linux Linux6.16.10Vendor (CNA)
Linux Linux6.6.109Vendor (CNA)
Linux Linux8703940bd30b5ad94408d28d7192db2491cd3592Vendor (CNA)
Linux Linuxd0ca0df179c4b21e2a6c4a4fb637aa8fa14575cbVendor (CNA)
Linux Linuxd382d6daf0184490f366562469a5673f65ee2662Vendor (CNA)
Linux Linuxfbe96bd25423e61273d8831e995260b429d850b6Vendor (CNA)
debian:linux6.1.158-1 · Debian:12Package registry (OSV)
opensuse:dtb-aarch646.12.0-160000.37.1 · openSUSE:Leap 16.0Package registry (OSV)
opensuse:kernel-64kb6.12.0-160000.37.1 · openSUSE:Leap 16.0Package registry (OSV)
opensuse:kernel-azure6.12.0-160000.37.1 · openSUSE:Leap 16.0Package registry (OSV)
opensuse:kernel-default6.12.0-160000.37.1 · openSUSE:Leap 16.0Package registry (OSV)
opensuse:kernel-default-base6.12.0-160000.37.1.160000.2.19 · openSUSE:Leap 16.0Package registry (OSV)
opensuse:kernel-docs6.12.0-160000.37.1 · openSUSE:Leap 16.0Package registry (OSV)
opensuse:kernel-kvmsmall6.12.0-160000.37.1 · openSUSE:Leap 16.0Package registry (OSV)
opensuse:kernel-obs-build6.12.0-160000.37.1 · openSUSE:Leap 16.0Package registry (OSV)
opensuse:kernel-obs-qa6.12.0-160000.37.1 · openSUSE:Leap 16.0Package registry (OSV)
opensuse:kernel-rt6.12.0-160000.37.1 · openSUSE:Leap 16.0Package registry (OSV)
opensuse:kernel-source6.12.0-160000.37.1 · openSUSE:Leap 16.0Package registry (OSV)
opensuse:kernel-syms6.12.0-160000.37.1 · openSUSE:Leap 16.0Package registry (OSV)
suse:kernel-64kb6.12.0-160000.37.1 · SUSE:Linux Micro 6.2Package registry (OSV)
suse:kernel-azure6.12.0-160000.37.1 · SUSE:Linux Enterprise Server 16.0Package registry (OSV)
suse:kernel-default6.12.0-160000.37.1 · SUSE:Linux Micro 6.2Package registry (OSV)
suse:kernel-default-base6.12.0-160000.37.1.160000.2.19 · SUSE:Linux Micro 6.2Package registry (OSV)
suse:kernel-docs6.12.0-160000.37.1 · SUSE:Linux Enterprise Server 16.0Package registry (OSV)
suse:kernel-kvmsmall6.12.0-160000.37.1 · SUSE:Linux Enterprise Server 16.0Package registry (OSV)

+6

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.

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✗ → ✓

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

References

Show all references (9 more)

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

All records