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NVD / CVE Program· CNA Linux

CVE-2026-31677: crypto: af_alg - limit RX SG extraction by receive buffer budget

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: 0.15% (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 07c6f6ffe29009426f0bd4d3cfbb6308b8ea8453, 4a264b2614c73c96666e196bbabe0cead52bdba7, 7e345de2e69475430af85e09210795d8eb8e719c; azl3 kernel 6.6.152.1-1 on Azure Linux 3.0 Release Notes; azl3 kernel 6.6.157.1-1 on Azure Linux 3.0 Release Notes.

Low priority for now. Upgrade to Linux Linux 07c6f6ffe29009426f0bd4d3cfbb6308b8ea8453, 4a264b2614c73c96666e196bbabe0cead52bdba7, 7e345de2e69475430af85e09210795d8eb8e719c; azl3 kernel 6.6.152.1-1 on Azure Linux 3.0 Release Notes; azl3 kernel 6.6.157.1-1 on Azure Linux 3.0 Release Notes 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 - limit RX SG extraction by receive buffer budget Make af_alg_get_rsgl() limit each RX scatterlist extraction to the remaining receive buffer budget. af_alg_get_rsgl() currently uses af_alg_readable() only as a gate before extracting data into the RX scatterlist. Limit each extraction to the remaining af_alg_rcvbuf(sk) budget so that receive-side accounting matches the amount of data attached to the request. If skcipher cannot obtain enough RX space for at least one chunk while more data remains to be processed, reject the recvmsg call instead of rounding the request length down to zero.

MediumCVSS 5.5 · v3.1—No exploit Fix available
Published
Apr 25, 2026
Updated
Oct 30, 2026
EPSS
0.1% · 4th percentile
CWE
—

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%

Get told when this record changes

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

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

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  • when exploit code appears or is weaponized
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  • 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 kernel4.14 and later · before 6.12.83
  • linux linux kernel6.13 and later · before 6.18.24
  • linux linux kernel6.19 and later · before 6.19.14
  • linux linux kernel7.0

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

    • 4.14affected
    • e870456d8e7c8d57c059ea479b5aadbb55ff4c3a and later · before 960c56743988d8ce9ff9b5d770dbeb5f64823a23affected · git
    • e870456d8e7c8d57c059ea479b5aadbb55ff4c3a and later · before 7e345de2e69475430af85e09210795d8eb8e719caffected · git
    • e870456d8e7c8d57c059ea479b5aadbb55ff4c3a and later · before 9bf3e6ccfdcfe56ae3190d1ae987dacf1cfef4f9affected · git
    • e870456d8e7c8d57c059ea479b5aadbb55ff4c3a and later · before 07c6f6ffe29009426f0bd4d3cfbb6308b8ea8453affected · git
    • e870456d8e7c8d57c059ea479b5aadbb55ff4c3a and later · before 4a264b2614c73c96666e196bbabe0cead52bdba7affected · git
    • e870456d8e7c8d57c059ea479b5aadbb55ff4c3a and later · before 8eceab19eba9dcbfd2a0daec72e1bf48aa100170affected · git
    • before 4.14not affected · semver
    • 6.1.191 and later · up to and including 6.1.*not affected · semver
    • 6.6.160 and later · up to and including 6.6.*not affected · semver

Package-level exposure

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

EcosystemPackageAffected rangeFix
AlmaLinux:10kernelbefore 6.12.0-211.7.3.el10_26.12.0-211.7.3.el10_2
AlmaLinux:10kernel-64kbefore 6.12.0-211.7.3.el10_26.12.0-211.7.3.el10_2
AlmaLinux:10kernel-64k-corebefore 6.12.0-211.7.3.el10_26.12.0-211.7.3.el10_2
AlmaLinux:10kernel-64k-debugbefore 6.12.0-211.7.3.el10_26.12.0-211.7.3.el10_2
AlmaLinux:10kernel-64k-debug-corebefore 6.12.0-211.7.3.el10_26.12.0-211.7.3.el10_2
AlmaLinux:10kernel-64k-debug-develbefore 6.12.0-211.7.3.el10_26.12.0-211.7.3.el10_2
AlmaLinux:10kernel-64k-debug-devel-matchedbefore 6.12.0-211.7.3.el10_26.12.0-211.7.3.el10_2
AlmaLinux:10kernel-64k-debug-modulesbefore 6.12.0-211.7.3.el10_26.12.0-211.7.3.el10_2
AlmaLinux:10kernel-64k-debug-modules-corebefore 6.12.0-211.7.3.el10_26.12.0-211.7.3.el10_2
AlmaLinux:10kernel-64k-debug-modules-extrabefore 6.12.0-211.7.3.el10_26.12.0-211.7.3.el10_2
AlmaLinux:10kernel-64k-develbefore 6.12.0-211.7.3.el10_26.12.0-211.7.3.el10_2
AlmaLinux:10kernel-64k-devel-matchedbefore 6.12.0-211.7.3.el10_26.12.0-211.7.3.el10_2
AlmaLinux:10kernel-64k-modulesbefore 6.12.0-211.7.3.el10_26.12.0-211.7.3.el10_2
AlmaLinux:10kernel-64k-modules-corebefore 6.12.0-211.7.3.el10_26.12.0-211.7.3.el10_2
AlmaLinux:10kernel-64k-modules-extrabefore 6.12.0-211.7.3.el10_26.12.0-211.7.3.el10_2
AlmaLinux:10kernel-abi-stablelistsbefore 6.12.0-211.7.3.el10_26.12.0-211.7.3.el10_2
AlmaLinux:10kernel-corebefore 6.12.0-211.7.3.el10_26.12.0-211.7.3.el10_2
AlmaLinux:10kernel-cross-headersbefore 6.12.0-211.7.3.el10_26.12.0-211.7.3.el10_2
AlmaLinux:10kernel-debugbefore 6.12.0-211.7.3.el10_26.12.0-211.7.3.el10_2
AlmaLinux:10kernel-debug-corebefore 6.12.0-211.7.3.el10_26.12.0-211.7.3.el10_2
AlmaLinux:10kernel-debug-develbefore 6.12.0-211.7.3.el10_26.12.0-211.7.3.el10_2
AlmaLinux:10kernel-debug-devel-matchedbefore 6.12.0-211.7.3.el10_26.12.0-211.7.3.el10_2
AlmaLinux:10kernel-debug-modulesbefore 6.12.0-211.7.3.el10_26.12.0-211.7.3.el10_2
AlmaLinux:10kernel-debug-modules-corebefore 6.12.0-211.7.3.el10_26.12.0-211.7.3.el10_2

+96

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-2026-31675Apr 25, 2026 · net/sched: sch_netem: fix out-of-bounds access in packet corruption
    31Monitor
  • ← EarlierCVE-2026-31676Apr 25, 2026 · rxrpc: only handle RESPONSE during service challenge
    30Monitor
  • Later →CVE-2026-31678Apr 25, 2026 · openvswitch: defer tunnel netdev_put to RCU release
    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 Linux07c6f6ffe29009426f0bd4d3cfbb6308b8ea8453Vendor (CNA)
Linux Linux4a264b2614c73c96666e196bbabe0cead52bdba7Vendor (CNA)
Linux Linux7e345de2e69475430af85e09210795d8eb8e719cVendor (CNA)
Linux Linux8eceab19eba9dcbfd2a0daec72e1bf48aa100170Vendor (CNA)
Linux Linux960c56743988d8ce9ff9b5d770dbeb5f64823a23Vendor (CNA)
Linux Linux9bf3e6ccfdcfe56ae3190d1ae987dacf1cfef4f9Vendor (CNA)
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:kernel6.12.0-211.7.3.el10_2 · AlmaLinux:10Package registry (OSV)
almalinux:kernel-64k6.12.0-211.7.3.el10_2 · AlmaLinux:10Package registry (OSV)
almalinux:kernel-64k-core6.12.0-211.7.3.el10_2 · AlmaLinux:10Package registry (OSV)
almalinux:kernel-64k-debug6.12.0-211.7.3.el10_2 · AlmaLinux:10Package registry (OSV)
almalinux:kernel-64k-debug-core6.12.0-211.7.3.el10_2 · AlmaLinux:10Package registry (OSV)
almalinux:kernel-64k-debug-devel6.12.0-211.7.3.el10_2 · AlmaLinux:10Package registry (OSV)
almalinux:kernel-64k-debug-devel-matched6.12.0-211.7.3.el10_2 · AlmaLinux:10Package registry (OSV)
almalinux:kernel-64k-debug-modules6.12.0-211.7.3.el10_2 · AlmaLinux:10Package registry (OSV)
almalinux:kernel-64k-debug-modules-core6.12.0-211.7.3.el10_2 · AlmaLinux:10Package registry (OSV)
almalinux:kernel-64k-debug-modules-extra6.12.0-211.7.3.el10_2 · AlmaLinux:10Package registry (OSV)
almalinux:kernel-64k-devel6.12.0-211.7.3.el10_2 · AlmaLinux:10Package registry (OSV)
almalinux:kernel-64k-devel-matched6.12.0-211.7.3.el10_2 · AlmaLinux:10Package registry (OSV)
debian:linux6.12.85-1 · Debian:13Package registry (OSV)
red hat:kernel-64k-debug-debuginfo0:6.12.0-211.7.3.el10_2 · Red Hat:enterprise_linux:10.2Package registry (OSV)
red hat:kernel-64k-debug-devel0:6.12.0-211.7.3.el10_2 · Red Hat:enterprise_linux:10.2Package registry (OSV)
red hat:kernel-64k-debug-devel-matched0:6.12.0-211.7.3.el10_2 · Red Hat:enterprise_linux:10.2Package registry (OSV)
red hat:kernel-64k-debuginfo0:6.12.0-211.7.3.el10_2 · Red Hat:enterprise_linux:10.2Package registry (OSV)
red hat:kernel-64k-devel0:6.12.0-211.7.3.el10_2 · Red Hat:enterprise_linux:10.2Package registry (OSV)
red hat:kernel-64k-devel-matched0:6.12.0-211.7.3.el10_2 · Red Hat:enterprise_linux:10.2Package registry (OSV)
red hat:kernel-debug-debuginfo0:6.12.0-211.7.3.el10_2 · Red Hat:enterprise_linux:10.2Package registry (OSV)
red hat:kernel-debug-devel0:6.12.0-211.7.3.el10_2 · Red Hat:enterprise_linux:10.2Package registry (OSV)
red hat:kernel-debug-devel-matched0:6.12.0-211.7.3.el10_2 · Red Hat:enterprise_linux:10.2Package registry (OSV)

+15

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

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.

Change log

  1. Fix✗ → ✓

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

References

Show all references (5 more)

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

All records