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NVD / CVE Program· CNA Linux

CVE-2026-45857: scsi: csiostor: Fix dereference of null pointer rn

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: 0.16% (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 16ccbfddcb32365138c806cf572e69b42a193c5c, 1982257570b84dc33753d536dd969fd357a014e9, 25ab5e97d3c5f3ed594b4a65d1cc99dc24756681.
  • Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. Upgrade to Linux Linux 16ccbfddcb32365138c806cf572e69b42a193c5c, 1982257570b84dc33753d536dd969fd357a014e9, 25ab5e97d3c5f3ed594b4a65d1cc99dc24756681 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: scsi: csiostor: Fix dereference of null pointer rn The error exit path when rn is NULL ends up deferencing the null pointer rn via the use of the macro CSIO_INC_STATS. Fix this by adding a new error return path label after the use of the macro to avoid the deference.

MediumCVSS 5.5 · v3.1—No exploit Fix available
Published
May 27, 2026
Updated
Jun 25, 2026
EPSS
0.1% · 5th percentile

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 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.

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 kernel3.8 and later · before 5.10.252
  • linux linux kernel5.11 and later · before 5.15.202
  • linux linux kernel5.16 and later · before 6.1.165
  • linux linux kernel6.2 and later · before 6.6.128
  • linux linux kernel6.7 and later · before 6.12.75
  • linux linux kernel6.13 and later · before 6.18.14
  • linux linux kernel6.19 and later · before 6.19.4

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

    • 3.8affected
    • a3667aaed5698b84bad2f1b3f71adc86499f4bc6 and later · before 16ccbfddcb32365138c806cf572e69b42a193c5caffected · git
    • a3667aaed5698b84bad2f1b3f71adc86499f4bc6 and later · before 44ef9f81392de885883f73b9f5c43936a82ae9d7affected · git
    • a3667aaed5698b84bad2f1b3f71adc86499f4bc6 and later · before 526ea3c0ccd495b0079db3e28fdddd51c1bf01f7affected · git
    • a3667aaed5698b84bad2f1b3f71adc86499f4bc6 and later · before 25d623f0d77c11a256a54e860d00c239aa9a2583affected · git
    • a3667aaed5698b84bad2f1b3f71adc86499f4bc6 and later · before 6037124dbf675fbd0a6248aaf04cf07387b8c323affected · git
    • a3667aaed5698b84bad2f1b3f71adc86499f4bc6 and later · before 25ab5e97d3c5f3ed594b4a65d1cc99dc24756681affected · git
    • a3667aaed5698b84bad2f1b3f71adc86499f4bc6 and later · before 3bbbab7b6949c76df64210348adbefedaabbf549affected · git
    • a3667aaed5698b84bad2f1b3f71adc86499f4bc6 and later · before 1982257570b84dc33753d536dd969fd357a014e9affected · git
    • before 3.8not affected · semver

Package-level exposure

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

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 6.1.170-16.1.170-1
Debian:13linuxbefore 6.12.85-16.12.85-1
Debian:14linuxbefore 6.18.14-16.18.14-1

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-2026-45853May 27, 2026 · drm/amdgpu: Use kvfree instead of kfree in amdgpu_gmc_get_nps_memranges()
    31Monitor
  • ← EarlierCVE-2026-45854May 27, 2026 · crypto: inside-secure/eip93 - unregister only available algorithm
    22Monitor
  • Later →CVE-2026-45858May 27, 2026 · ext4: don't zero the entire extent if EXT4_EXT_DATA_PARTIAL_VALID1
    22Monitor

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 Linux16ccbfddcb32365138c806cf572e69b42a193c5cVendor (CNA)
Linux Linux1982257570b84dc33753d536dd969fd357a014e9Vendor (CNA)
Linux Linux25ab5e97d3c5f3ed594b4a65d1cc99dc24756681Vendor (CNA)
Linux Linux25d623f0d77c11a256a54e860d00c239aa9a2583Vendor (CNA)
Linux Linux3bbbab7b6949c76df64210348adbefedaabbf549Vendor (CNA)
Linux Linux44ef9f81392de885883f73b9f5c43936a82ae9d7Vendor (CNA)
Linux Linux526ea3c0ccd495b0079db3e28fdddd51c1bf01f7Vendor (CNA)
Linux Linux6037124dbf675fbd0a6248aaf04cf07387b8c323Vendor (CNA)
debian:linux6.1.170-1 · 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.

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).

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.
  • 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)

CWE-476 · NULL Pointer Dereference

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 (7 more)

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

All records