CASCACascade Atlas

Evidence dossier

CVE-2023-0266

Use after free in SNDRV_CTL_IOCTL_ELEM in Linux Kernel

61.3–78.6Priority evidence range
As known Jul 19, 2026, 5:00 AM UTCgen-56ccdaf9

Normalized restatement

A use after free vulnerability exists in the ALSA PCM package in the Linux Kernel. SNDRV_CTL_IOCTL_ELEM_{READ|WRITE}32 is missing locks that can be used in a use-after-free that can result in a priviledge escalation to gain ring0 access from the system user. We recommend upgrading past commit 56b88b50565cd8b946a2d00b0c83927b7ebb055e

State
PUBLISHED
Published
Jan 30, 2023
Updated
Oct 21, 2025
Evidence coverage
85%
CISA KEVCatalog member

Apply updates per vendor instructions.

FIRST EPSS3.70%

2026-07-18 · v2026.06.15 · percentile 88.5%

Source stateNo scored conflict

Distinct CVSS assessments remain side by side; none are averaged.

Source comparison

Who said what

CISA-ADPindependent enrichment
container

CISA ADP Vulnrichment

CVEderivative copy
container

CVE Program Container

Googleoriginal assertion
container

Use after free in SNDRV_CTL_IOCTL_ELEM in Linux Kernel

CISA KEVoriginal assertion
observed_exploitation

Linux Kernel Use-After-Free Vulnerability

FIRST EPSSoriginal assertion
model_probability

Probability 0.037020000000; percentile 0.885160000000

Applicability

Cited product scope

Trace impact →
LinuxLinux Kernel
[{"status": "affected", "version": "4.14", "lessThan": "56b88b50565cd8b946a2d00b0c83927b7ebb055e", "versionType": "git"}]unknown
Unknown vendorUnknown product
cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*supported
Unknown vendorUnknown product
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*; start including 4.14; end excluding 4.14.303supported
Unknown vendorUnknown product
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*; start including 4.15; end excluding 4.19.270supported
Unknown vendorUnknown product
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*; start including 4.20; end excluding 5.4.229supported
Unknown vendorUnknown product
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*; start including 5.5; end excluding 5.10.163supported
Unknown vendorUnknown product
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*; start including 5.11; end excluding 5.15.88supported
Unknown vendorUnknown product
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*; start including 5.16; end excluding 6.1.6supported

Assessments

CVSS by origin

7.0
nvd@nist.govCVSS 3.1 · role PrimaryCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
7.9
cve-coordination@google.comCVSS 3.1 · role SecondaryCVSS:3.1/AV:A/AC:H/PR:L/UI:N/S:C/C:L/I:H/A:H
7.9
GoogleCVSS 3.1 · role unknownCVSS:3.1/AV:A/AC:H/PR:L/UI:N/S:C/C:L/I:H/A:H

Limitations and unknowns

  • KEV membership is authoritative for the catalog, not proof of exposure in any environment.
  • EPSS is a dated model probability and not an individual-environment prediction.
  • Affected or fixed status applies only to the exact cited product and version scope; unresolved scope remains unknown.
  • NVD-carried upstream facts remain derivative and are not independent corroboration.
  • Only NVD metrics validated under the generation-bound calculator are Public Priority eligible; direct CVE record metrics remain display-only.
  • NVD CVSS source eligibility is closed: NVD-authored, exact record-source, or registered same-CVE container origin; unmapped sources remain display-only.
  • Factor D is unknown in Public Core because no accepted canonical mapping-obligation ledger is present.
  • Core replay supports the active and immediately prior generation; retrospective valid-at replay is deferred.