# CVE-2026-73584: Sblim-sfcb: sblim-sfcb: privileged file corruption and denial of service via insecure temporary file handling

Status: published. Published: 2026-08-13. Updated: 2026-11-05.

A flaw was found in sblim-sfcb. A local, low-privileged attacker can exploit a race condition during privileged instance migration by manipulating a temporary file in the `/tmp` directory. By repeatedly recreating a symbolic link, the attacker can redirect privileged output to an arbitrary file. This can lead to privileged file corruption or a denial of service (DoS) on the system.

## Remediation

- workaround: To mitigate this issue, if instance migration is not required, run the `sfcbrepos` command with the `-i` option to disable the vulnerable migration path. For example: `sudo sfcbrepos -f -i`. Alternatively, avoid running `sfcbrepos` with elevated privileges on systems where untrusted local users can concurrently write to the `/tmp` directory. A service restart or reload may be required for changes to take effect if `sfcbrepos` is managed by a service. (source: CNA: redhat)

## Affected products and versions

- Red Hat / Red Hat Enterprise Linux 10 (sblim-sfcb): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 6 (sblim-sfcb): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 7 (sblim-sfcb): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 8 (sblim-sfcb): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 9 (sblim-sfcb): Version range not reported. Source: CNA: redhat

## Severity and prioritization

- CVSS 3.1: 6.3 (medium); CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:H/A:H; source: CNA: redhat

- CISA KEV: No listing in collected sources

- EPSS: 0.13% as of 2026-11-05; percentile 2.34%

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

- Weaknesses: CWE-377

## Exploit evidence

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

## References

- https://access.redhat.com/security/cve/CVE-2026-73584 (CNA: redhat; vdb-entry, x_refsource_REDHAT)

- https://bugzilla.redhat.com/show_bug.cgi?id=2462721 (CNA: redhat; issue-tracking, x_refsource_REDHAT)

## Provenance

- CNA: redhat: https://www.cve.org/CVERecord?id=CVE-2026-73584; retrieved 2026-11-05; source updated 2026-11-05

- FIRST EPSS: https://api.first.org/data/v1/epss?cve=CVE-2026-73584; retrieved 2026-11-05; source updated Not reported

Revision: 0ce590dcd4ac67a6739f26ebea94b3c751edac2b1059e053b55859b891bc9033

Canonical: https://y2.dev/cve/CVE-2026-73584

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