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NVD / CVE Program· CNA Linux

CVE-2025-68296: drm, fbcon, vga_switcheroo: Avoid race condition in fbcon setup

Noroxi assessment

Priority: Monitor (action score 0/100)

  • 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: 0.20% (FIRST EPSS).
  • Fixed version: Linux Linux 05814c389b53d2f3a0b9eeb90ba7a05ba77c4c2a, 482330f8261b4bea8146d9bd69c1199e5dfcbb5c, 711ebd961190def4c69ea24b2f0be75e995af24a.

Low priority for now. Upgrade to Linux Linux 05814c389b53d2f3a0b9eeb90ba7a05ba77c4c2a, 482330f8261b4bea8146d9bd69c1199e5dfcbb5c, 711ebd961190def4c69ea24b2f0be75e995af24a 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: drm, fbcon, vga_switcheroo: Avoid race condition in fbcon setup Protect vga_switcheroo_client_fb_set() with console lock. Avoids OOB access in fbcon_remap_all(). Without holding the console lock the call races with switching outputs. VGA switcheroo calls fbcon_remap_all() when switching clients. The fbcon function uses struct fb_info.node, which is set by register_framebuffer(). As the fb-helper code currently sets up VGA switcheroo before registering the framebuffer, the value of node is -1 and therefore not a legal value. For example, fbcon uses the value within set_con2fb_map() [1] as an index into an array. Moving vga_switcheroo_client_fb_set() after register_framebuffer() can result in VGA switching that does not switch fbcon correctly. Therefore move vga_switcheroo_client_fb_set() under fbcon_fb_registered(), which already holds the console lock. Fbdev calls fbcon_fb_registered() from within register_framebuffer(). Serializes the helper with VGA switcheroo's call to fbcon_remap_all(). Although vga_switcheroo_client_fb_set() takes an instance of struct fb_info as parameter, it really only needs the contained fbcon state. Moving the call to fbcon initialization is therefore cleaner than before. Only amdgpu, i915, nouveau and radeon support vga_switcheroo. For all other drivers, this change does nothing.

—No exploit Fix available
Published
Dec 16, 2025
Updated
Oct 14, 2026
EPSS
0.2% · 9th percentile
CWE
—

Report tools

JSON

Action score

0

Monitor

Low priority for now.

CVSS
0 / 40 · —
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.2%

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Noroxi analysis

What does it mean in your environment?

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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.

—

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

    • 2.6.34affected
    • 6a9ee8af344e3bd7dbd61e67037096cdf7f83289 and later · before 711ebd961190def4c69ea24b2f0be75e995af24aaffected · git
    • 6a9ee8af344e3bd7dbd61e67037096cdf7f83289 and later · before 482330f8261b4bea8146d9bd69c1199e5dfcbb5caffected · git
    • 6a9ee8af344e3bd7dbd61e67037096cdf7f83289 and later · before 05814c389b53d2f3a0b9eeb90ba7a05ba77c4c2aaffected · git
    • 6a9ee8af344e3bd7dbd61e67037096cdf7f83289 and later · before eb76d0f5553575599561010f24c277cc5b31d003affected · git
    • before 2.6.34not affected · semver
    • 6.6.143 and later · up to and including 6.6.*not affected · semver
    • 6.12.61 and later · up to and including 6.12.*not affected · semver
    • 6.17.11 and later · up to and including 6.17.*not affected · semver
    • 6.18 and laternot affected · original_commit_for_fix

Package-level exposure

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

EcosystemPackageAffected rangeFix
Debian:12linuxfrom 0—
Debian:13linuxbefore 6.12.63-16.12.63-1
Debian:14linuxbefore 6.17.11-16.17.11-1

Same product

linux: all records

Other highest-scoring records for the same primary product.

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    40Plan
  • CVE-2026-74612veth: fix skb length accounting after XDP frag adjustment
    40Plan
  • CVE-2026-74475vxlan: use neigh_ha_snapshot() in route_shortcircuit()
    40Plan

Published before and after this one in the same product

  • ← EarlierCVE-2025-68294Dec 16, 2025 · io_uring/net: ensure vectored buffer node import is tied to notification
    31Monitor
  • ← EarlierCVE-2025-68295Dec 16, 2025 · smb: client: fix memory leak in cifs_construct_tcon()
    0Monitor
  • Later →CVE-2025-68297Dec 16, 2025 · ceph: fix crash in process_v2_sparse_read() for encrypted directories
    0Monitor

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 Linux05814c389b53d2f3a0b9eeb90ba7a05ba77c4c2aVendor (CNA)
Linux Linux482330f8261b4bea8146d9bd69c1199e5dfcbb5cVendor (CNA)
Linux Linux711ebd961190def4c69ea24b2f0be75e995af24aVendor (CNA)
Linux Linuxeb76d0f5553575599561010f24c277cc5b31d003Vendor (CNA)
debian:linux6.12.63-1 · Debian:13Package 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.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

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

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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).

Technical details

No CVSS vector for this record, so attack conditions can't be derived.

Weakness class (CWE)

—

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✗ → ✓

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References

Show all references (3 more)

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

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