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NVD / CVE Program· CNA Linux

CVE-2026-80555: s390/vfio_ccw: Free all memory if cp_init() fails

Noroxi assessment

Priority: Monitor (action score 28/100)

  • 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: 0.13% (FIRST EPSS).
  • Someone with local access to the system can trigger it. No account or password is required. No user action is required. No special conditions are required; it is repeatable.
  • Fixed version: Linux Linux 152fcb74a26804b70909381c6acc90595a0ae1c1, 17e01e342af74de12899c206dcc9ec90684703aa, 276bd7ed34d56c48c65c43c0b08f2ee77029b2fa.
  • Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. Upgrade to Linux Linux 152fcb74a26804b70909381c6acc90595a0ae1c1, 17e01e342af74de12899c206dcc9ec90684703aa, 276bd7ed34d56c48c65c43c0b08f2ee77029b2fa 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: s390/vfio_ccw: Free all memory if cp_init() fails The routine cp_free() is called to unpin/free any memory once an I/O is completed successfully, or if cp_prefetch() fails. But if cp_init() fails, and cp->initialized is not enabled, the same routine cannot be used to free all the memory. An attempt to address this exists in ccwchain_handle_ccw(), where a single call to ccwchain_free() is made for the currently-processed CCW segment. But this will leak other segments (created as a result of a Transfer in Channel) that had been allocated as part of the same channel program. Address this by performing the cleanup outside of the recursive ccwchain_handle_ccw()/ccwchain_loop_tic() logic.

HighCVSS 7.1 · v3.1—No exploit Fix available
Published
Aug 26, 2026
Updated
Aug 27, 2026
EPSS
0.1% · 3th percentile
CWE
—

Report tools

JSON

Action score

28

Monitor

Low priority for now.

CVSS
28 / 40 · 7.1 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.1%

CNA vs NVD score

NVD
—
CNA · Linux
7.1
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-2026-80555

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

    • 5.3affected
    • 8b515be512a2435bb8aedc6390cbe140167f9eb9 and later · before 276bd7ed34d56c48c65c43c0b08f2ee77029b2faaffected · git
    • 8b515be512a2435bb8aedc6390cbe140167f9eb9 and later · before f9bcff265556796834122f95de16d52a8375206caffected · git
    • 8b515be512a2435bb8aedc6390cbe140167f9eb9 and later · before 17e01e342af74de12899c206dcc9ec90684703aaaffected · git
    • 8b515be512a2435bb8aedc6390cbe140167f9eb9 and later · before 152fcb74a26804b70909381c6acc90595a0ae1c1affected · git
    • 8b515be512a2435bb8aedc6390cbe140167f9eb9 and later · before 6a917199aaf97904f5619afe3dfdacb155b03e8caffected · git
    • 8b515be512a2435bb8aedc6390cbe140167f9eb9 and later · before 32e3d364a7b8295120d37e6a6bd433d2de26f748affected · git
    • 8b515be512a2435bb8aedc6390cbe140167f9eb9 and later · before 4699b54fada156534cbb39834d47fc9374d7a1f5affected · git
    • 8b515be512a2435bb8aedc6390cbe140167f9eb9 and later · before 74186c2968f8f756ac3226b545b598457c910c75affected · git
    • before 5.3not affected · semver

Package-level exposure

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

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 6.1.187-16.1.187-1
Debian:12linux-6.12before 6.12.107-1~deb12u16.12.107-1~deb12u1
Debian:13linuxbefore 6.12.105-16.12.105-1
Debian:14linuxbefore 7.1.10-17.1.10-1

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-2026-80539Aug 26, 2026 · drm/amdgpu: disallow multiple FENCE chunks in one submit
    0Monitor
  • ← EarlierCVE-2026-80542Aug 26, 2026 · drm/amd/display: Fix NULL pointer dereference in amdgpu_dm_crtc_set_vblank()
    0Monitor
  • Later →CVE-2026-80556Aug 26, 2026 · mmc: atmel-mci: Fix use-after-free in atmci_remove due to race condition
    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 Linux152fcb74a26804b70909381c6acc90595a0ae1c1Vendor (CNA)
Linux Linux17e01e342af74de12899c206dcc9ec90684703aaVendor (CNA)
Linux Linux276bd7ed34d56c48c65c43c0b08f2ee77029b2faVendor (CNA)
Linux Linux32e3d364a7b8295120d37e6a6bd433d2de26f748Vendor (CNA)
Linux Linux4699b54fada156534cbb39834d47fc9374d7a1f5Vendor (CNA)
Linux Linux6a917199aaf97904f5619afe3dfdacb155b03e8cVendor (CNA)
Linux Linux74186c2968f8f756ac3226b545b598457c910c75Vendor (CNA)
Linux Linuxf9bcff265556796834122f95de16d52a8375206cVendor (CNA)
debian:linux6.1.187-1 · Debian:12Package registry (OSV)
debian:linux-6.126.12.107-1~deb12u1 · 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

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).

National notice (Türkiye Cybersecurity Directorate / USOM)

Official security notices citing this record; remediation advice is on the agency's page.

All national notices →

Technical details

Attack conditions

  • Someone with local access to the system 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

Impact can extend beyond the vulnerable component (scope changes).

Attack vector
Local
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
Changed
Confidentiality impact
None
Integrity impact
None
Availability impact
High

Weakness class (CWE)

—

CVSS vector

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