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CVE-2026-97604· NVD / CVE Program· CNA Linux

fbdev: vfb: defer cleanup until the last reference

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: 0.21% (FIRST EPSS).
  • Fixed version: Linux Linux 040ce3950f64a11e9ee5646c8aaa91fd2e29e245, 3c91e51a53cf805e551e5dc8149cd0539a6dbb9d, 5ff1effb047e465cde193d7df95988aa1520035e; azl3 kernel 6.6.157.1-1 on Azure Linux 3.0 6.6.158.1-1.
  • Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. Upgrade to Linux Linux 040ce3950f64a11e9ee5646c8aaa91fd2e29e245, 3c91e51a53cf805e551e5dc8149cd0539a6dbb9d, 5ff1effb047e465cde193d7df95988aa1520035e; azl3 kernel 6.6.157.1-1 on Azure Linux 3.0 6.6.158.1-1 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: fbdev: vfb: defer cleanup until the last reference FBIOGETCMAP takes a shallow snapshot of info->cmap and performs the usercopy after dropping info->lock. vfb_remove() frees the colormap immediately after unregistering the framebuffer, even when an open file still holds a reference to fb_info. A concurrent driver unbind can therefore free the colormap while the ioctl copies it to userspace. KASAN reports: BUG: KASAN: slab-use-after-free in _copy_to_user Read of size 512 by task poc/125 _copy_to_user (./include/linux/instrumented.h:129 ./include/linux/uaccess.h:201 lib/usercopy.c:24) fb_cmap_to_user (./include/linux/uaccess.h:230 drivers/video/fbdev/core/fbcmap.c:211) do_fb_ioctl (drivers/video/fbdev/core/fb_chrdev.c:114) Allocated by task 1: fb_alloc_cmap_gfp (./include/linux/slab.h:973 ./include/linux/slab.h:1290 drivers/video/fbdev/core/fbcmap.c:108) vfb_probe (drivers/video/fbdev/vfb.c:459) Freed by task 124: fb_dealloc_cmap (drivers/video/fbdev/core/fbcmap.c:151) vfb_remove (drivers/video/fbdev/vfb.c:489) unregister_framebuffer() drops the registration reference, and fbdev calls fb_destroy after the last put_fb_info(). Move the registered framebuffer's cleanup into an fb_destroy callback so its colormap and screen buffer stay alive until all file references have been released.

—No exploit Fix available
Published
Sep 25, 2026
Updated
Oct 19, 2026
EPSS
0.2% · 10th 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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  • A fix has been released

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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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

    • 2.6.30affected
    • 5e266e2e0e19532c1b8e2e2bff1eb6ccf42e478a and later · before bf49eac7ed11aabd0b9b790c062742a8e4be97c6affected · git
    • 5e266e2e0e19532c1b8e2e2bff1eb6ccf42e478a and later · before 040ce3950f64a11e9ee5646c8aaa91fd2e29e245affected · git
    • 5e266e2e0e19532c1b8e2e2bff1eb6ccf42e478a and later · before ab664e279eb2a68e55895dd115a9488807280f07affected · git
    • 5e266e2e0e19532c1b8e2e2bff1eb6ccf42e478a and later · before de5a0eda59fe4b3eacd1a67c992e54766bb6683faffected · git
    • 5e266e2e0e19532c1b8e2e2bff1eb6ccf42e478a and later · before 86356f13598f59f5acb1754895747dcdaf65a254affected · git
    • 5e266e2e0e19532c1b8e2e2bff1eb6ccf42e478a and later · before 5ff1effb047e465cde193d7df95988aa1520035eaffected · git
    • 5e266e2e0e19532c1b8e2e2bff1eb6ccf42e478a and later · before 3c91e51a53cf805e551e5dc8149cd0539a6dbb9daffected · git
    • 5e266e2e0e19532c1b8e2e2bff1eb6ccf42e478a and later · before a0a34a40ed299c9c7cff6af163a5b883ee9d6d73affected · git
    • before 2.6.30not affected · semver

Package-level exposure

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

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 6.1.190-16.1.190-1
Debian:12linux-6.12before 6.12.111-1~deb12u16.12.111-1~deb12u1
Debian:13linuxbefore 6.12.111-16.12.111-1
Debian:14linuxbefore 7.2.7-17.2.7-1

Same product

linux: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-74705udp: fix potential use-after-free in tunnel segmentation
    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-2026-97602Sep 25, 2026 · inet: frags: invalidate queues before flushing them
    31Monitor
  • ← EarlierCVE-2026-97603Sep 25, 2026 · idpf: disable DIM work before freeing q_vectors
    0Monitor
  • Later →CVE-2026-97605Sep 25, 2026 · erofs: preserve LZMA decoders on resize failure
    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 Linux040ce3950f64a11e9ee5646c8aaa91fd2e29e245Vendor (CNA)
Linux Linux3c91e51a53cf805e551e5dc8149cd0539a6dbb9dVendor (CNA)
Linux Linux5ff1effb047e465cde193d7df95988aa1520035eVendor (CNA)
Linux Linux86356f13598f59f5acb1754895747dcdaf65a254Vendor (CNA)
Linux Linuxa0a34a40ed299c9c7cff6af163a5b883ee9d6d73Vendor (CNA)
Linux Linuxab664e279eb2a68e55895dd115a9488807280f07Vendor (CNA)
Linux Linuxbf49eac7ed11aabd0b9b790c062742a8e4be97c6Vendor (CNA)
Linux Linuxde5a0eda59fe4b3eacd1a67c992e54766bb6683fVendor (CNA)
azl3 kernel 6.6.157.1-1 on Azure Linux 3.06.6.158.1-1 · Release NotesMicrosoft (MSRC)
debian:linux6.1.190-1 · Debian:12Package registry (OSV)
debian:linux6.12.111-1 · Debian:13Package registry (OSV)
debian:linux-6.126.12.111-1~deb12u1 · Debian:12Package 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

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

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).

National notice (Türkiye Cybersecurity Directorate / USOM)

Official security notices citing this record; remediation advice is on the agency's page.

All national notices →

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✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Show all references (7 more)

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

All records