CVE-2026-12610: A flaw was found in sssd

Routine

MEDIUM 6.4WATCHLISTMITIGATEMITIGATE

CVE-2026-12610 is a medium-severity flaw (CVSS 6.4) affecting sssd, enterprise linux. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

A flaw was found in sssd. When authenticating with a YubiKey, the SSSD PAM responder can crash due to a use-after-free vulnerability, where a memory pointer is incorrectly handled. A local attacker could exploit this flaw by manipulating smartcard or YubiKey contents, leading to a denial of service that disrupts authentication. This vulnerability also presents a potential for privilege escalation, although it is difficult to exploit.

Why this priority

On your watchlist

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	6.4 (Medium)
Attack vector	Local
Attack complexity	High
Privileges needed	High
User interaction	None
EPSS exploit chance	0.1% (top 98%)
CISA exploited list	No
Weakness	CWE-825
Published	2026-06-30
Last modified	2026-08-31

Publisher (CNA): Red Hat, Inc. · Vendor: fedoraproject · redhat

Last updated 2026-08-31 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-06-30 10:16 UTCPublished CVE record published
2026-08-31 19:16 UTCUpdated Record last modified

fedoraproject sssd MITIGATE

Affected: all versions

Fixed in: no fixed release known

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy sssd || rpm -q sssd || sssd --version

No fixed or unaffected release known

Apply the vendor mitigation from the advisory, disable the affected feature, or restrict network access.

redhat enterprise linux MITIGATE

Affected: 8.0 · 9.0 · 10.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 8.0

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-12610?

sssd: mitigate or apply the listed mitigation; enterprise linux: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2026-12610 being exploited?

CVE-2026-12610 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-12610 affect?

CVE-2026-12610 affects sssd, enterprise linux. Severity is medium (CVSS 6.4). A flaw was found in sssd. When authenticating with a YubiKey, the SSSD PAM responder can crash due to a use-after-free vulnerability, where a memory pointer is incorrectly handled. A local attacker could exploit this flaw by manipulating sm

How urgent is CVE-2026-12610?

Priority 28/100. On your watchlist

Related CVEs

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CVE-2026-88252 MEDIUM 4.7 DOWNGRADE DOWNGRADE A flaw was found in sssd
CVE-2026-104040 MEDIUM 4.4 DOWNGRADE DOWNGRADE A flaw was found in SSSD
CVE-2026-90995 MEDIUM 5.5 DOWNGRADE DOWNGRADE A flaw was found in SSSD (System Security Services Daemon)
CVE-2026-104045 MEDIUM 4.7 DOWNGRADE DOWNGRADE A flaw was found in SSSD

References

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