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Fencer Vulns
high 7.9

CVE-2023-0266 kev in the critical feed json

Use after free in SNDRV_CTL_IOCTL_ELEM in Linux Kernel

published 2023-01-30 3 y ago modified 2026-06-17 4 mo ago also EUVD-2023-12345

cvss
7.9
version 3.1, CNA
cisa kev
Exploited
added 2023-03-30
epss
3.7%
EPSS 3.7% chance of exploitation in 30 days, percentile 89%
public exploits
0
none known

Summary

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

Patch / fix

cisa required action Apply updates per vendor instructions.

  • linux linux_kernel 4.14.303, 4.19.270, 5.4.229, 5.10.163, 5.15.88, 6.1.6
  • linux Debian 14, Debian 13, Debian 12 6.1.7-1

debian advisories DEBIAN-CVE-2023-0266

  • linux Ubuntu 18.04 LTS 4.15.0-208.220
  • linux Ubuntu 20.04 LTS 5.4.0-144.161
  • linux Ubuntu 22.04 LTS 5.15.0-69.76
  • linux-aws Ubuntu 18.04 LTS 4.15.0-1153.166
  • linux-aws Ubuntu 20.04 LTS 5.4.0-1097.105
  • linux-aws Ubuntu 22.04 LTS 5.15.0-1033.37
  • linux-gcp Ubuntu 20.04 LTS 5.4.0-1101.110
  • linux-gcp Ubuntu 22.04 LTS 5.15.0-1031.38

ubuntu advisories UBUNTU-CVE-2023-0266

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • kpatch-patch-4_18_0-425_3_1 RHEL 8 1-6.el8
  • kpatch-patch-4_18_0-425_10_1 RHEL 8 1-4.el8_7
  • kpatch-patch-4_18_0-425_13_1 RHEL 8 1-2.el8_7
  • redhat-virtualization-host rhev hypervisor 4.4 4.5.3-202304051438_8.6
  • redhat-virtualization-host-image-update rhev hypervisor 4.4 4.5.3-202304051438_8.6
  • kernel RHEL 8 4.18.0-425.19.2.el8_7
  • perf RHEL 8 4.18.0-425.19.2.el8_7
  • bpftool RHEL 8 4.18.0-425.19.2.el8_7

red hat advisories RHSA-2023:1659RHSA-2023:1677RHSA-2023:1435RHSA-2023:1202RHSA-2023:1203RHSA-2023:1566

  • kernel-azure SLES for SAP 12 SP5, SLES 12 SP5 4.12.14-16.124.1
  • kernel-syms-azure SLES for SAP 12 SP5, SLES 12 SP5 4.12.14-16.124.1
  • kernel-source-azure SLES for SAP 12 SP5, SLES 12 SP5 4.12.14-16.124.1
  • kernel-rt SLE Micro 5.2, SLE Micro 5.1, Real Time Module 15 SP3 5.3.18-150300.121.1
  • kernel-syms-rt Real Time Module 15 SP3 5.3.18-150300.121.1
  • kernel-rt_debug Real Time Module 15 SP3 5.3.18-150300.121.1
  • kernel-source-rt Real Time Module 15 SP3 5.3.18-150300.121.1
  • kernel-syms SLES for SAP 12 SP5, SLES 12 SP5 4.12.14-122.150.1

suse advisories SUSE-SU-2023:0618-1SUSE-SU-2023:1708-1SUSE-SU-2023:1653-1SUSE-SU-2023:1649-1SUSE-SU-2023:1647-1SUSE-SU-2023:1640-1

  • kernel AlmaLinux 8 4.18.0-425.19.2.el8_7
  • perf AlmaLinux 8 4.18.0-425.19.2.el8_7
  • bpftool AlmaLinux 8 4.18.0-425.19.2.el8_7
  • kernel-core AlmaLinux 8 4.18.0-425.19.2.el8_7
  • kernel-tools AlmaLinux 8 4.18.0-425.19.2.el8_7
  • python3-perf AlmaLinux 8 4.18.0-425.19.2.el8_7
  • kernel-modules AlmaLinux 8 4.18.0-425.19.2.el8_7
  • kernel-zfcpdump AlmaLinux 8 4.18.0-425.19.2.el8_7

almalinux advisories ALSA-2023:1566ALSA-2023:1584ALSA-2023:1469ALSA-2023:1470

  • kernel Rocky Linux 8 4.18.0-425.19.2.el8_7.cloud
  • kernel-rt Rocky Linux 8 4.18.0-425.19.2.rt7.230.el8_7
  • kernel Rocky Linux 8 4.18.0-425.19.2.el8_7
  • kernel Rocky Linux 9 5.14.0-162.22.2.el9_1
  • kernel-rt Rocky Linux 9 5.14.0-162.22.2.rt21.186.el9_1

rocky linux advisories RXSA-2023:1566RLSA-2023:1584RLSA-2023:1566RLSA-2023:1470RLSA-2023:1469

  • hyperv-daemons CBL-Mariner 2.0 5.15.92.1-1
  • kernel CBL-Mariner 2.0 5.15.92.1-1

azure linux advisories AZL-13190AZL-13229

Azure Linux vulnerability data, Copyright (c) Microsoft Corporation, from https://github.com/microsoft/AzureLinuxVulnerabilityData via OSV, under the MIT licence; changed: normalised to fixed package versions per release. MIT

  • linux-lts Arch Linux 6.2-1
  • linux-hardened Arch Linux 6.2-1
  • linux-zen Arch Linux 6.2-1
  • linux Arch Linux 6.2-1

arch linux advisories AVG-2834AVG-2835AVG-2836AVG-2837

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2023-0266 updated cvss 7.8

ALSA: pcm: Move rwsem lock inside snd_ctl_elem_read to prevent UAF

  • Red Hat CodeReady Linux Builder (v. 8) kernel-debuginfo-common-x86_64 4.18.0-425.19.2.el8_7, kernel-debuginfo-common-aarch64 4.18.0-425.19.2.el8_7, kernel-debuginfo-common-ppc64le 4.18.0-425.19.2.el8_7
    fixed: vendor fix RHSA-2023:1566
  • Red Hat CodeReady Linux Builder (v. 9) kernel-debuginfo-common-s390x 5.14.0-162.22.2.el9_1, kernel-debuginfo-common-x86_64 5.14.0-162.22.2.el9_1, kernel-debuginfo-common-aarch64 5.14.0-162.22.2.el9_1, kernel-debuginfo-common-ppc64le 5.14.0-162.22.2.el9_1
    fixed: vendor fix RHSA-2023:1470
  • Red Hat CodeReady Linux Builder EUS (v.8.6) kernel-debuginfo-common-x86_64 4.18.0-372.51.1.el8_6, kernel-debuginfo-common-aarch64 4.18.0-372.51.1.el8_6, kernel-debuginfo-common-ppc64le 4.18.0-372.51.1.el8_6
    fixed: vendor fix RHSA-2023:1554
  • Red Hat CodeReady Linux Builder EUS (v.9.0) kernel-debuginfo-common-s390x 5.14.0-70.49.1.el9_0, kernel-debuginfo-common-x86_64 5.14.0-70.49.1.el9_0, kernel-debuginfo-common-aarch64 5.14.0-70.49.1.el9_0, kernel-debuginfo-common-ppc64le 5.14.0-70.49.1.el9_0
    fixed: vendor fix RHSA-2023:1202
  • Red Hat Enterprise Linux AppStream (v. 9) perf 5.14.0-162.22.2.el9_1, kernel-devel-matched 5.14.0-162.22.2.el9_1, kernel-debug-devel-matched 5.14.0-162.22.2.el9_1, kernel-debuginfo-common-s390x 5.14.0-162.22.2.el9_1, kernel-zfcpdump-devel-matched 5.14.0-162.22.2.el9_1, kernel-debuginfo-common-x86_64 5.14.0-162.22.2.el9_1, +2 more
    fixed: vendor fix RHSA-2023:1470
  • Red Hat Enterprise Linux AppStream EUS (v.9.0) perf 5.14.0-70.49.1.el9_0, kernel-devel-matched 5.14.0-70.49.1.el9_0, kernel-debug-devel-matched 5.14.0-70.49.1.el9_0, kernel-debuginfo-common-s390x 5.14.0-70.49.1.el9_0, kernel-zfcpdump-devel-matched 5.14.0-70.49.1.el9_0, kernel-debuginfo-common-x86_64 5.14.0-70.49.1.el9_0, +2 more
    fixed: vendor fix RHSA-2023:1202
  • Red Hat Enterprise Linux BaseOS (v. 8) perf 4.18.0-425.19.2.el8_7, kernel 4.18.0-425.19.2.el8_7, bpftool 4.18.0-425.19.2.el8_7, kernel-core 4.18.0-425.19.2.el8_7, kernel-tools 4.18.0-425.19.2.el8_7, python3-perf 4.18.0-425.19.2.el8_7, +18 more
    fixed: vendor fix RHSA-2023:1566
  • Red Hat Enterprise Linux BaseOS (v. 9) kernel 5.14.0-162.22.2.el9_1, bpftool 5.14.0-162.22.2.el9_1, kernel-core 5.14.0-162.22.2.el9_1, kernel-tools 5.14.0-162.22.2.el9_1, python3-perf 5.14.0-162.22.2.el9_1, kernel-modules 5.14.0-162.22.2.el9_1, +17 more
    fixed: vendor fix RHSA-2023:1470
show 19 more
  • Red Hat Enterprise Linux BaseOS AUS (v. 8.2) perf 4.18.0-193.105.1.el8_2, kernel 4.18.0-193.105.1.el8_2, bpftool 4.18.0-193.105.1.el8_2, kernel-core 4.18.0-193.105.1.el8_2, kernel-tools 4.18.0-193.105.1.el8_2, python3-perf 4.18.0-193.105.1.el8_2, +8 more
    fixed: vendor fix RHSA-2023:1559
  • Red Hat Enterprise Linux BaseOS E4S (v. 8.1) perf 4.18.0-147.81.1.el8_1, kernel 4.18.0-147.81.1.el8_1, bpftool 4.18.0-147.81.1.el8_1, kernel-core 4.18.0-147.81.1.el8_1, kernel-tools 4.18.0-147.81.1.el8_1, python3-perf 4.18.0-147.81.1.el8_1, +14 more
    fixed: vendor fix RHSA-2023:1588
  • Red Hat Enterprise Linux BaseOS E4S (v. 8.2) perf 4.18.0-193.105.1.el8_2, kernel 4.18.0-193.105.1.el8_2, bpftool 4.18.0-193.105.1.el8_2, kernel-core 4.18.0-193.105.1.el8_2, kernel-tools 4.18.0-193.105.1.el8_2, python3-perf 4.18.0-193.105.1.el8_2, +14 more
    fixed: vendor fix RHSA-2023:1559
  • Red Hat Enterprise Linux BaseOS EUS (v.8.4) perf 4.18.0-305.86.2.el8_4, kernel 4.18.0-305.86.2.el8_4, bpftool 4.18.0-305.86.2.el8_4, kernel-core 4.18.0-305.86.2.el8_4, kernel-tools 4.18.0-305.86.2.el8_4, python3-perf 4.18.0-305.86.2.el8_4, +20 more
    fixed: vendor fix RHSA-2023:1557
  • Red Hat Enterprise Linux BaseOS EUS (v.8.6) perf 4.18.0-372.51.1.el8_6, kernel 4.18.0-372.51.1.el8_6, bpftool 4.18.0-372.51.1.el8_6, kernel-core 4.18.0-372.51.1.el8_6, kernel-tools 4.18.0-372.51.1.el8_6, python3-perf 4.18.0-372.51.1.el8_6, +21 more
    fixed: vendor fix RHSA-2023:1554
  • Red Hat Enterprise Linux BaseOS EUS (v.9.0) kernel 5.14.0-70.49.1.el9_0, bpftool 5.14.0-70.49.1.el9_0, kernel-core 5.14.0-70.49.1.el9_0, kernel-tools 5.14.0-70.49.1.el9_0, python3-perf 5.14.0-70.49.1.el9_0, kernel-modules 5.14.0-70.49.1.el9_0, +19 more
    fixed: vendor fix RHSA-2023:1202
  • Red Hat Enterprise Linux BaseOS TUS (v. 8.2) perf 4.18.0-193.105.1.el8_2, kernel 4.18.0-193.105.1.el8_2, bpftool 4.18.0-193.105.1.el8_2, kernel-core 4.18.0-193.105.1.el8_2, kernel-tools 4.18.0-193.105.1.el8_2, python3-perf 4.18.0-193.105.1.el8_2, +8 more
    fixed: vendor fix RHSA-2023:1559
  • Red Hat Enterprise Linux CRB EUS (v.8.4) kernel-debuginfo-common-x86_64 4.18.0-305.86.2.el8_4, kernel-debuginfo-common-aarch64 4.18.0-305.86.2.el8_4, kernel-debuginfo-common-ppc64le 4.18.0-305.86.2.el8_4
    fixed: vendor fix RHSA-2023:1557
  • Red Hat Enterprise Linux for Real Time (v. 8) kernel-rt 4.18.0-425.19.2.rt7.230.el8_7, kernel-rt-core 4.18.0-425.19.2.rt7.230.el8_7, kernel-rt-modules 4.18.0-425.19.2.rt7.230.el8_7, kernel-rt-debug-core 4.18.0-425.19.2.rt7.230.el8_7, kernel-rt-debug-modules 4.18.0-425.19.2.rt7.230.el8_7, kernel-rt-modules-extra 4.18.0-425.19.2.rt7.230.el8_7, +2 more
    fixed: vendor fix RHSA-2023:1584
  • Red Hat Enterprise Linux NFV EUS (v.8.4) kernel-rt 4.18.0-305.86.2.rt7.160.el8_4, kernel-rt-kvm 4.18.0-305.86.2.rt7.160.el8_4, kernel-rt-core 4.18.0-305.86.2.rt7.160.el8_4, kernel-rt-modules 4.18.0-305.86.2.rt7.160.el8_4, kernel-rt-debug-kvm 4.18.0-305.86.2.rt7.160.el8_4, kernel-rt-debug-core 4.18.0-305.86.2.rt7.160.el8_4, +4 more
    fixed: vendor fix RHSA-2023:1556
  • Red Hat Enterprise Linux Real Time (v. 9) kernel-rt 5.14.0-162.22.2.rt21.186.el9_1, kernel-rt-core 5.14.0-162.22.2.rt21.186.el9_1, kernel-rt-modules 5.14.0-162.22.2.rt21.186.el9_1, kernel-rt-debug-core 5.14.0-162.22.2.rt21.186.el9_1, kernel-rt-debug-modules 5.14.0-162.22.2.rt21.186.el9_1, kernel-rt-modules-extra 5.14.0-162.22.2.rt21.186.el9_1, +2 more
    fixed: vendor fix RHSA-2023:1469
  • Red Hat Enterprise Linux Real Time EUS (v.9.0) kernel-rt 5.14.0-70.49.1.rt21.120.el9_0, kernel-rt-core 5.14.0-70.49.1.rt21.120.el9_0, kernel-rt-modules 5.14.0-70.49.1.rt21.120.el9_0, kernel-rt-debug-core 5.14.0-70.49.1.rt21.120.el9_0, kernel-rt-debug-modules 5.14.0-70.49.1.rt21.120.el9_0, kernel-rt-modules-extra 5.14.0-70.49.1.rt21.120.el9_0, +2 more
    fixed: vendor fix RHSA-2023:1203
  • Red Hat Enterprise Linux Real Time for NFV (v. 8) kernel-rt 4.18.0-425.19.2.rt7.230.el8_7, kernel-rt-kvm 4.18.0-425.19.2.rt7.230.el8_7, kernel-rt-core 4.18.0-425.19.2.rt7.230.el8_7, kernel-rt-modules 4.18.0-425.19.2.rt7.230.el8_7, kernel-rt-debug-kvm 4.18.0-425.19.2.rt7.230.el8_7, kernel-rt-debug-core 4.18.0-425.19.2.rt7.230.el8_7, +4 more
    fixed: vendor fix RHSA-2023:1584
  • Red Hat Enterprise Linux Real Time for NFV (v. 9) kernel-rt 5.14.0-162.22.2.rt21.186.el9_1, kernel-rt-kvm 5.14.0-162.22.2.rt21.186.el9_1, kernel-rt-core 5.14.0-162.22.2.rt21.186.el9_1, kernel-rt-modules 5.14.0-162.22.2.rt21.186.el9_1, kernel-rt-debug-kvm 5.14.0-162.22.2.rt21.186.el9_1, kernel-rt-debug-core 5.14.0-162.22.2.rt21.186.el9_1, +4 more
    fixed: vendor fix RHSA-2023:1469
  • Red Hat Enterprise Linux Real Time for NFV EUS (v.9.0) kernel-rt 5.14.0-70.49.1.rt21.120.el9_0, kernel-rt-kvm 5.14.0-70.49.1.rt21.120.el9_0, kernel-rt-core 5.14.0-70.49.1.rt21.120.el9_0, kernel-rt-modules 5.14.0-70.49.1.rt21.120.el9_0, kernel-rt-debug-kvm 5.14.0-70.49.1.rt21.120.el9_0, kernel-rt-debug-core 5.14.0-70.49.1.rt21.120.el9_0, +4 more
    fixed: vendor fix RHSA-2023:1203
  • Red Hat Enterprise Linux Real Time for NFV TUS (v. 8.2) kernel-rt 4.18.0-193.105.1.rt13.156.el8_2, kernel-rt-kvm 4.18.0-193.105.1.rt13.156.el8_2, kernel-rt-core 4.18.0-193.105.1.rt13.156.el8_2, kernel-rt-modules 4.18.0-193.105.1.rt13.156.el8_2, kernel-rt-debug-kvm 4.18.0-193.105.1.rt13.156.el8_2, kernel-rt-debug-core 4.18.0-193.105.1.rt13.156.el8_2, +4 more Red Hat Enterprise Linux Real Time TUS (v. 8.2) kernel-rt 4.18.0-193.105.1.rt13.156.el8_2, kernel-rt-core 4.18.0-193.105.1.rt13.156.el8_2, kernel-rt-modules 4.18.0-193.105.1.rt13.156.el8_2, kernel-rt-debug-core 4.18.0-193.105.1.rt13.156.el8_2, kernel-rt-debug-modules 4.18.0-193.105.1.rt13.156.el8_2, kernel-rt-modules-extra 4.18.0-193.105.1.rt13.156.el8_2, +2 more
    fixed: vendor fix RHSA-2023:1560
  • Red Hat Enterprise Linux RT EUS (v.8.4) kernel-rt 4.18.0-305.86.2.rt7.160.el8_4, kernel-rt-core 4.18.0-305.86.2.rt7.160.el8_4, kernel-rt-modules 4.18.0-305.86.2.rt7.160.el8_4, kernel-rt-debug-core 4.18.0-305.86.2.rt7.160.el8_4, kernel-rt-debug-modules 4.18.0-305.86.2.rt7.160.el8_4, kernel-rt-modules-extra 4.18.0-305.86.2.rt7.160.el8_4, +2 more
    fixed: vendor fix RHSA-2023:1556
  • Red Hat Virtualization 4 Hypervisor for RHEL 8 perf 4.18.0-372.51.1.el8_6, redhat-virtualization-host 4.5.3-202304051438_8.6, kernel-debuginfo-common-x86_64 4.18.0-372.51.1.el8_6, redhat-virtualization-host-image-update 4.5.3-202304051438_8.6
    fixed: vendor fix RHSA-2023:1554
  • Red Hat Enterprise Linux 6 perf, kernel, python-perf, kernel-kdump, kernel-firmware, kernel-bootwrapper, +1 more Red Hat Enterprise Linux 7 perf, kernel, bpftool, kernel-rt, python-perf, kernel-kdump, +8 more Red Hat RHEL 8-based RHEV-H for RHEV 4 (build requirements) redhat-release-virtualization-host 4.5.3-6.el8ev, redhat-release-virtualization-host-content 4.5.3-6.el8ev, redhat-virtualization-host-image-update-placeholder 4.5.3-6.el8ev
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Timeline

  1. Found exploited as a 0-day (Project Zero)
  2. Published
  3. Added to CISA KEV
  4. CISA patch deadline
  5. 0-day patched (Project Zero)
  6. CISA SSVC: exploitation active

Known exploited

Added
3 y ago
Patch by
2023-04-20 (3 y ago)
Ransomware
Not known
Required action
Apply updates per vendor instructions.
Vendor, product
Linux, Kernel
CISA name
Linux Kernel Use-After-Free Vulnerability

Zero-day

Detected in real attacks while still unknown to the vendor and the public, per Google Project Zero's 0day In-the-Wild tracker.

Found
2023-01-12
Patched
2023-05-01
Details
project zero tracker

CISA SSVC

Exploitation
Active, exploited in the wild
Automatable
no
Technical impact
total
Assessed
21 mo ago

Exploit prediction

3.70% chance of exploitation in the next 30 days, higher than 89% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 7.9 CVSS:3.1/AV:A/AC:H/PR:L/UI:N/S:C/C:L/I:H/A:H
NVD 3.1 7.0 CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected products

  • Linux Linux Kernel

Classification

Weakness
Technology feeds

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.