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

Status: published. Published: 2026-05-27. Updated: 2026-11-06.

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.

## Remediation

No remediation reported in collected sources

## Affected products and versions

- Linux / Linux: ≥ a3667aaed5698b84bad2f1b3f71adc86499f4bc6; < 16ccbfddcb32365138c806cf572e69b42a193c5c (affected, git); ≥ a3667aaed5698b84bad2f1b3f71adc86499f4bc6; < 44ef9f81392de885883f73b9f5c43936a82ae9d7 (affected, git); ≥ a3667aaed5698b84bad2f1b3f71adc86499f4bc6; < 526ea3c0ccd495b0079db3e28fdddd51c1bf01f7 (affected, git); ≥ a3667aaed5698b84bad2f1b3f71adc86499f4bc6; < 25d623f0d77c11a256a54e860d00c239aa9a2583 (affected, git); ≥ a3667aaed5698b84bad2f1b3f71adc86499f4bc6; < 6037124dbf675fbd0a6248aaf04cf07387b8c323 (affected, git); ≥ a3667aaed5698b84bad2f1b3f71adc86499f4bc6; < 25ab5e97d3c5f3ed594b4a65d1cc99dc24756681 (affected, git); ≥ a3667aaed5698b84bad2f1b3f71adc86499f4bc6; < 3bbbab7b6949c76df64210348adbefedaabbf549 (affected, git); ≥ a3667aaed5698b84bad2f1b3f71adc86499f4bc6; < 1982257570b84dc33753d536dd969fd357a014e9 (affected, git). Source: CNA: Linux
- Linux / Linux: 3.8 (affected); ≥ 0; < 3.8 (unaffected, semver); ≥ 5.10.252; ≤ 5.10.* (unaffected, semver); ≥ 5.15.202; ≤ 5.15.* (unaffected, semver); ≥ 6.1.165; ≤ 6.1.* (unaffected, semver); ≥ 6.6.128; ≤ 6.6.* (unaffected, semver); ≥ 6.12.75; ≤ 6.12.* (unaffected, semver); ≥ 6.18.14; ≤ 6.18.* (unaffected, semver); ≥ 6.19.4; ≤ 6.19.* (unaffected, semver); ≥ 7.0; ≤ * (unaffected, original_commit_for_fix). Source: CNA: Linux

## Severity and prioritization

- CISA KEV: No listing in collected sources

- EPSS: 0.16% as of 2026-11-06; percentile 5.27%

- SSVC: exploitation none; automatable no; technical impact partial; source ADP: CISA-ADP

- Weaknesses: Not reported

## Exploit evidence

No exploit evidence in collected sources. This is not proof of no exploitation.

## References

- https://git.kernel.org/stable/c/16ccbfddcb32365138c806cf572e69b42a193c5c (CNA: Linux)

- https://git.kernel.org/stable/c/44ef9f81392de885883f73b9f5c43936a82ae9d7 (CNA: Linux)

- https://git.kernel.org/stable/c/526ea3c0ccd495b0079db3e28fdddd51c1bf01f7 (CNA: Linux)

- https://git.kernel.org/stable/c/25d623f0d77c11a256a54e860d00c239aa9a2583 (CNA: Linux)

- https://git.kernel.org/stable/c/6037124dbf675fbd0a6248aaf04cf07387b8c323 (CNA: Linux)

- https://git.kernel.org/stable/c/25ab5e97d3c5f3ed594b4a65d1cc99dc24756681 (CNA: Linux)

- https://git.kernel.org/stable/c/3bbbab7b6949c76df64210348adbefedaabbf549 (CNA: Linux)

- https://git.kernel.org/stable/c/1982257570b84dc33753d536dd969fd357a014e9 (CNA: Linux)

## Provenance

- CNA: Linux: https://www.cve.org/CVERecord?id=CVE-2026-45857; retrieved 2026-11-06; source updated 2026-11-06

- FIRST EPSS: https://api.first.org/data/v1/epss?cve=CVE-2026-45857; retrieved 2026-11-06; source updated Not reported

Revision: 9654237bf5dea9db3b071e057081d574484b4dfe498780e22e561fc91f7102e9

Canonical: https://y2.dev/cve/CVE-2026-45857

## Agent and API access

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- OpenAPI: https://y2.dev/api/openapi.yaml. Agent access metadata: https://y2.dev/cve/agent.json.

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