# CVE-2026-6245: Sssd: out-of-bounds read in the sssd

> A local attacker can crash the SSSD PAM responder via an out-of-bounds read in passkey authentication, causing a denial of service.

- **Severity:** Medium 5.5 (`CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Local or same network only
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 15 Apr 2026
- **Updated:** 1 Sep 2026
- **Also known as:** DEBIAN-CVE-2026-6245, GHSA-g672-w7xh-qp9j, OESA-2026-2169, OESA-2026-2170, OESA-2026-2171, UBUNTU-CVE-2026-6245, USN-8355-1, openSUSE-SU-2026:10659-1

## What is CVE-2026-6245?

CVE-2026-6245 is a medium-severity memory corruption vulnerability in Redhat Enterprise Linux, published on 15 Apr 2026. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

A flaw was found in the System Security Services Daemon (SSSD). The pam_passkey_child_read_data() function within the PAM passkey responder fails to properly handle raw bytes received from a pipe. Because the data is treated as a NUL-terminated C string without explicit termination, it results in an out-of-bounds read when processed by functions like snprintf(). A local attacker could potentially trigger this vulnerability by initiating a crafted passkey authentication request, causing the SSSD PAM responder to crash, resulting in a local Denial of Service (DoS).

Weakness: CWE-805 (Buffer Access with Incorrect Length Value)

## Which versions are affected by CVE-2026-6245?

It affects 3 products.


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `sssd` | openSUSE:Tumbleweed | All versions | 2.13.0-1.1 |

Products: Fedoraproject Sssd, Redhat Enterprise Linux, Redhat Openshift Container Platform.

## How do I fix CVE-2026-6245?

Apply the vendor's patch.

## Is CVE-2026-6245 being exploited?

There is no known exploitation of CVE-2026-6245 in the wild and no public exploit code.

## Other vulnerabilities in Redhat Enterprise Linux

- [CVE-2022-4254](https://insights.sbomify.com/CVE-2022-4254/): Other in SSSD (high 8.8)
- [CVE-2012-3462](https://insights.sbomify.com/CVE-2012-3462/): Auth bypass in sssd (high 8.8)
- [CVE-2026-104048](https://insights.sbomify.com/CVE-2026-104048/): Sssd: sssd: authorization bypass via cross-domain username collision in hbac evaluation (medium 6.8)
- [CVE-2015-5292](https://insights.sbomify.com/CVE-2015-5292/): Denial of service in n/a (medium 6.8)
- [CVE-2026-12610](https://insights.sbomify.com/CVE-2026-12610/): Sssd: use-after-free crash in sssd' 'sssd_pam' process (medium 6.4)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-6245 and fix it if it is affected.

What it is: CVE-2026-6245 is a medium-severity memory corruption vulnerability in Redhat Enterprise Linux, published on 15 Apr 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-6245 in the wild and no public exploit code.

Affected product: Redhat Enterprise Linux. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-6245/ (Markdown: https://insights.sbomify.com/CVE-2026-6245/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-6245
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-6245
- OSV: https://osv.dev/vulnerability/CVE-2026-6245

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-6245/
Summaries are generated and may contain mistakes; the official description above is the record.