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NVD / CVE Program· CNA Linux

CVE-2026-72374: afs: Fix callback service message parsers to pass through -EAGAIN

Noroxi assessment

Priority: Monitor (action score 30/100)

  • 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: 0.71% (FIRST EPSS); higher than 54% of all records.
  • Anyone who can reach it over the internet can trigger it. No account or password is required. No user action is required. No special conditions are required; it is repeatable.
  • According to CISA the attack is automatable: targets can be found by mass scanning.
  • Fixed version: Linux Linux 09c67a7ded481482155b836c8c7f078a3075f8de, 0acbc09d2aca0432af45cec114f20d55ceafaec4, 0f36469d7ce98b362934113c550d08bb0c784231.

Low priority for now. Upgrade to Linux Linux 09c67a7ded481482155b836c8c7f078a3075f8de, 0acbc09d2aca0432af45cec114f20d55ceafaec4, 0f36469d7ce98b362934113c550d08bb0c784231 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: afs: Fix callback service message parsers to pass through -EAGAIN The AFS filesystem client uses an rxrpc server to listen for callback notifications. Each callback call type handler has a delivery function that parses the incoming request stream, and this should return -EAGAIN the last packet hasn't yet been seen, but all currently queued received data is consumed. afs_extract_data() does this, but the -EAGAIN return is switched to 0 inadvertantly Fix callback service message parsers to pass through -EAGAIN

HighCVSS 7.5 · v3.1—No exploit Fix available
Published
Aug 15, 2026
Updated
Oct 16, 2026
EPSS
0.7% · 54th percentile
CWE
—

Report tools

JSON

Action score

30

Monitor

Low priority for now.

CVSS
30 / 40 · 7.5 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.7%

CISA SSVC decision

Exploitation
none
Automatable
yes
Technical impact
partial

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
—
CNA · Linux
7.5
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.

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.

Follow CVE-2026-72374

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

    • 4.9affected
    • d001648ec7cf8b21ae9eec8b9ba4a18295adfb14 and later · before 26b737b3769e92493fe94c34620399d93ca231aeaffected · git
    • d001648ec7cf8b21ae9eec8b9ba4a18295adfb14 and later · before 09c67a7ded481482155b836c8c7f078a3075f8deaffected · git
    • d001648ec7cf8b21ae9eec8b9ba4a18295adfb14 and later · before 239cd337c9d047e7097f5b2ebbb41ddfb8180bc6affected · git
    • d001648ec7cf8b21ae9eec8b9ba4a18295adfb14 and later · before 5a39b145a8fb49f316e7ec1f29ba51d68095c7e4affected · git
    • d001648ec7cf8b21ae9eec8b9ba4a18295adfb14 and later · before 772850871a2e772e26f9d93f1e9ddd413b3eeaa4affected · git
    • d001648ec7cf8b21ae9eec8b9ba4a18295adfb14 and later · before 0acbc09d2aca0432af45cec114f20d55ceafaec4affected · git
    • d001648ec7cf8b21ae9eec8b9ba4a18295adfb14 and later · before f14dd036fad3d359f26f1282199cec06b3a9362baffected · git
    • d001648ec7cf8b21ae9eec8b9ba4a18295adfb14 and later · before 0f36469d7ce98b362934113c550d08bb0c784231affected · git
    • before 4.9not affected · semver

Package-level exposure

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

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 6.1.180-16.1.180-1
Debian:13linuxbefore 6.12.100-16.12.100-1
Debian:14linuxbefore 7.1.5-17.1.5-1

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-2026-72371Aug 15, 2026 · afs: Fix the volume AFS_VOLUME_RM_TREE is set on
    31Monitor
  • ← EarlierCVE-2026-72373Aug 15, 2026 · afs: Fix missing NULL pointer check in afs_break_some_callbacks()
    30Monitor
  • Later →CVE-2026-72375Aug 15, 2026 · afs: Fix reinitialisation of the inode, in particular ->lock_work
    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 Linux09c67a7ded481482155b836c8c7f078a3075f8deVendor (CNA)
Linux Linux0acbc09d2aca0432af45cec114f20d55ceafaec4Vendor (CNA)
Linux Linux0f36469d7ce98b362934113c550d08bb0c784231Vendor (CNA)
Linux Linux239cd337c9d047e7097f5b2ebbb41ddfb8180bc6Vendor (CNA)
Linux Linux26b737b3769e92493fe94c34620399d93ca231aeVendor (CNA)
Linux Linux5a39b145a8fb49f316e7ec1f29ba51d68095c7e4Vendor (CNA)
Linux Linux772850871a2e772e26f9d93f1e9ddd413b3eeaa4Vendor (CNA)
Linux Linuxf14dd036fad3d359f26f1282199cec06b3a9362bVendor (CNA)
debian:linux6.1.180-1 · Debian:12Package 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.

EPSS, last 120 days+1% in 7 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.

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

  • Anyone who can reach it over the internet can trigger it.
  • No account or password is required.
  • 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
Network
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality impact
None
Integrity impact
None
Availability impact
High

Weakness class (CWE)

—

CVSS vector

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

MITRE has no CAPEC/ATT&CK mapping for this CWE.

Change log

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

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

References

Show all references (7 more)

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

All records