CVE-2023-0266

CRITICALNVD 7.99.0▲
EchelonGraph scoreHIGH confidence

Score elevated to 9.0 because this CVE is listed on the CISA Known Exploited Vulnerabilities catalog (added 2023-03-30), indicating real-world exploitation has been confirmed by US federal agencies. NVD baseline CVSS 7.9 retained for reference. Confidence: HIGH.

Triggered by: CISA KEV (actively exploited)
Sources: cisa_kev, epss, ghsa, nvd
Trending — 5 sources updated this weekExploited in the wild
9.0EG
EchelonGraph verdictPatch nowTreat as an emergency — this is being exploited.
  • Actively exploited in the wild (CISA-KEV)
CISA-KEV: ExploitedEPSS PROB: 4%CVSS: 7.9Exploit: cisa kev · ssvc active · public exploitExposed: 0

A fix is available — apply it.

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

CVSS v3
7.9
EG Score
9.0(high)
EG Risk
81(Attend)
EG Risk 81/100SSVC: Attend

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity90% × 45%
Exploitation100% × 40%
Automatability0% × 15%
Action: Remediate soon — notable exploitation risk.
EPSS PROB
4%
EPSS %ILE
89%
KEV
⚠ Exploited

Published

January 30, 2023

Last Modified

October 24, 2025

Advisory Details (5)

Auto-updated Jun 3, 2026
⚠️ Active exploitation confirmed. Patch available. Sources: cisa, github_commit.
cisa Patch Available🔴 Active Exploitation

Known Exploited Vulnerabilities Catalog | CISA

Known Exploited Vulnerabilities Catalog | CISA. Listed in CISA Known Exploited Vulnerabilities catalog.

https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2023-0266
generic Patch Available

[SECURITY] [DLA 3403-1] linux security update

https://lists.debian.org/debian-lts-announce/2023/05/msg00006.html
github_commit

commit becf9e5d553c (torvalds/linux)

Fix landed in torvalds/linux commit becf9e5d553c — awaiting tagged release

https://github.com/torvalds/linux/commit/becf9e5d553c2389d857a3c178ce80fdb34a02e1
github_commit

commit 56b88b50565c (torvalds/linux)

Fix landed in torvalds/linux commit 56b88b50565c — awaiting tagged release

https://github.com/torvalds/linux/commit/56b88b50565cd8b946a2d00b0c83927b7ebb055e
generic

alsa-pcm-move-rwsem-lock-inside-snd_ctl_elem_read-to-prevent-uaf.patch « queue-5.10 - kernel/git/stable/stable-queue.git - Linux kernel stable patch queue

https://git.kernel.org/pub/scm/linux/kernel/git/stable/stable-queue.git/tree/queue-5.10/alsa-pcm-move-rwsem-lock-inside-snd_ctl_elem_read-to-prevent-uaf.patch?id=72783cf35e6c55bca84c4bb7b776c58152856fd4

Vendor Advisories for CVE-2023-0266(5)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Patch Availability(24)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntulinux-snapdragon-headers-4.15.0-1148 (4.15.0-1148.158) @ bionic2026-09-19ubuntu
ubuntulinux-image-gcp-lts-18.04 (4.15.0.1147.161) @ bionic2026-09-19ubuntu
ubuntulinux-ibm-tools-5.15.0-1027 (5.15.0-1027.30) @ jammy2026-09-19ubuntu
ubuntulinux-image-gcp-edge (5.4.0.1101.77) @ bionic2026-09-19ubuntu
ubuntulinux-image-azure (4.15.0.1162.128) @ trusty2026-09-19ubuntu
ubuntulinux-tools-raspi-hwe-18.04-edge (5.4.0.1081.78) @ bionic2026-09-19ubuntu
ubuntulinux-headers-azure-edge (4.15.0.1162.146) @ xenial2026-09-19ubuntu
ubuntulinux-modules-5.15.0-1027-intel-iotg (5.15.0-1027.32) @ jammy2026-09-19ubuntu
ubuntulinux-image-raspi2-hwe-18.04 (5.4.0.1081.111) @ focal2026-09-19ubuntu
ubuntulinux-image-virtual-hwe-18.04-edge (5.4.0.144.142) @ focal2026-09-19ubuntu
redhatredhat-virtualization-host-0:4.5.3-202304051438_8.62023-04-10redhat
redhatkpatch-patch2023-04-05redhat
redhatkernel-0:4.18.0-147.81.1.el8_12023-04-04redhat
redhatkernel-rt-0:4.18.0-425.19.2.rt7.230.el8_72023-04-04redhat
redhatkernel-0:4.18.0-372.51.1.el8_62023-04-04redhat
redhatkernel-0:4.18.0-425.19.2.el8_72023-04-04redhat
redhatkernel-rt-0:4.18.0-193.105.1.rt13.156.el8_22023-04-04redhat
redhatkernel-0:4.18.0-193.105.1.el8_22023-04-04redhat
redhatkernel-0:4.18.0-305.86.2.el8_42023-04-04redhat
redhatkernel-rt-0:4.18.0-305.86.2.rt7.160.el8_42023-04-04redhat
redhatkernel-rt-0:5.14.0-162.22.2.rt21.186.el9_12023-03-27redhat
redhatkernel-0:5.14.0-162.22.2.el9_12023-03-27redhat
redhatkernel-0:5.14.0-70.49.1.el9_02023-03-14redhat
redhatkernel-rt-0:5.14.0-70.49.1.rt21.120.el9_02023-03-14redhat

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Affected Packages

(6 across 5 ecosystems)
Debian:10(2)
PackageVulnerable rangeFixed inDependents
linux4.19.118-1 ... 4.19.98-1~bpo9+1 (42 versions)4.19.282-1—
linux-5.105.10.136-1~deb10u1, 5.10.136-1~deb10u2, 5.10.136-1~deb10u3, 5.10.149-2~deb10u1, 5.10.158-2~deb10u15.10.162-1~deb10u1—
Debian:11(1)
PackageVulnerable rangeFixed inDependents
linux5.10.103-1 ... 5.10.92-2 (24 versions)5.10.162-1—
Debian:12(1)
PackageVulnerable rangeFixed inDependents
linux—6.1.7-1—
Debian:13(1)
PackageVulnerable rangeFixed inDependents
linux—6.1.7-1—
Debian:14(1)
PackageVulnerable rangeFixed inDependents
linux—6.1.7-1—

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Additional Vendor Advisories

(20)

Vendors that published advisories for this CVE beyond the curated set above. Broader coverage but minimal per-row detail — click through for the original advisory.

Data Freshness Timeline

(refreshed 93× in last 7d / 407× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 1,491 total refreshes for this CVE.

  1. 2026-09-19 08:08 UTCVendor advisory
  2. 2026-09-19 08:07 UTCGHSA enrichment
  3. 2026-09-19 03:55 UTCVendor advisory
  4. 2026-09-19 03:54 UTCGHSA enrichment
  5. 2026-09-18 23:42 UTCVendor advisory
  6. 2026-09-18 23:41 UTCGHSA enrichment
  7. 2026-09-18 19:28 UTCEG score recompute
  8. 2026-09-18 19:28 UTCVendor advisory
  9. 2026-09-18 19:28 UTCGHSA enrichment
  10. 2026-09-18 19:20 UTCCISA KEV update
  11. 2026-09-18 15:15 UTCVendor advisory
  12. 2026-09-18 15:15 UTCGHSA enrichment
  13. 2026-09-18 14:15 UTCCISA KEV update
  14. 2026-09-18 11:02 UTCVendor advisory
  15. 2026-09-18 11:02 UTCGHSA enrichment
  16. 2026-09-18 06:49 UTCVendor advisory
  17. 2026-09-18 06:49 UTCGHSA enrichment
  18. 2026-09-18 02:36 UTCVendor advisory
  19. 2026-09-18 02:36 UTCGHSA enrichment
  20. 2026-09-17 22:23 UTCEG score recompute
  21. 2026-09-17 22:23 UTCVendor advisory
  22. 2026-09-17 22:23 UTCGHSA enrichment
  23. 2026-09-17 18:09 UTCVendor advisory
  24. 2026-09-17 18:09 UTCGHSA enrichment
  25. 2026-09-17 13:56 UTCVendor advisory
Show 75 more
  1. 2026-09-17 13:56 UTCGHSA enrichment
  2. 2026-09-17 09:43 UTCVendor advisory
  3. 2026-09-17 09:43 UTCGHSA enrichment
  4. 2026-09-17 05:30 UTCVendor advisory
  5. 2026-09-17 05:30 UTCGHSA enrichment
  6. 2026-09-17 01:17 UTCVendor advisory
  7. 2026-09-17 01:17 UTCGHSA enrichment
  8. 2026-09-16 21:03 UTCVendor advisory
  9. 2026-09-16 21:03 UTCGHSA enrichment
  10. 2026-09-16 16:50 UTCEG score recompute
  11. 2026-09-16 16:50 UTCVendor advisory
  12. 2026-09-16 16:50 UTCGHSA enrichment
  13. 2026-09-16 14:10 UTCCISA KEV update
  14. 2026-09-16 14:05 UTCEPSS rescore
  15. 2026-09-16 12:37 UTCVendor advisory
  16. 2026-09-16 12:36 UTCGHSA enrichment
  17. 2026-09-16 08:24 UTCEG score recompute
  18. 2026-09-16 08:24 UTCVendor advisory
  19. 2026-09-16 08:24 UTCGHSA enrichment
  20. 2026-09-16 05:11 UTCEPSS rescore
  21. 2026-09-16 04:08 UTCVendor advisory
  22. 2026-09-16 04:08 UTCGHSA enrichment
  23. 2026-09-15 23:54 UTCVendor advisory
  24. 2026-09-15 23:54 UTCGHSA enrichment
  25. 2026-09-15 19:41 UTCVendor advisory
  26. 2026-09-15 19:41 UTCGHSA enrichment
  27. 2026-09-15 15:28 UTCVendor advisory
  28. 2026-09-15 15:28 UTCGHSA enrichment
  29. 2026-09-15 11:15 UTCVendor advisory
  30. 2026-09-15 11:15 UTCGHSA enrichment
  31. 2026-09-15 07:02 UTCEG score recompute
  32. 2026-09-15 07:02 UTCVendor advisory
  33. 2026-09-15 07:02 UTCGHSA enrichment
  34. 2026-09-15 03:07 UTCEPSS rescore
  35. 2026-09-15 02:49 UTCVendor advisory
  36. 2026-09-15 02:49 UTCGHSA enrichment
  37. 2026-09-14 22:36 UTCVendor advisory
  38. 2026-09-14 22:36 UTCGHSA enrichment
  39. 2026-09-14 19:24 UTCCISA KEV update
  40. 2026-09-14 18:23 UTCVendor advisory
  41. 2026-09-14 18:23 UTCGHSA enrichment
  42. 2026-09-14 14:10 UTCVendor advisory
  43. 2026-09-14 14:10 UTCGHSA enrichment
  44. 2026-09-14 09:57 UTCVendor advisory
  45. 2026-09-14 09:57 UTCGHSA enrichment
  46. 2026-09-14 05:41 UTCVendor advisory
  47. 2026-09-14 05:41 UTCGHSA enrichment
  48. 2026-09-14 01:28 UTCVendor advisory
  49. 2026-09-14 01:28 UTCGHSA enrichment
  50. 2026-09-13 21:15 UTCVendor advisory
  51. 2026-09-13 21:15 UTCGHSA enrichment
  52. 2026-09-13 17:02 UTCVendor advisory
  53. 2026-09-13 17:02 UTCGHSA enrichment
  54. 2026-09-13 12:49 UTCVendor advisory
  55. 2026-09-13 12:49 UTCGHSA enrichment
  56. 2026-09-13 08:36 UTCVendor advisory
  57. 2026-09-13 08:36 UTCGHSA enrichment
  58. 2026-09-13 04:23 UTCVendor advisory
  59. 2026-09-13 04:23 UTCGHSA enrichment
  60. 2026-09-13 00:10 UTCVendor advisory
  61. 2026-09-13 00:10 UTCGHSA enrichment
  62. 2026-09-12 19:57 UTCVendor advisory
  63. 2026-09-12 19:57 UTCGHSA enrichment
  64. 2026-09-12 15:44 UTCEG score recompute
  65. 2026-09-12 15:44 UTCVendor advisory
  66. 2026-09-12 15:44 UTCGHSA enrichment
  67. 2026-09-12 11:31 UTCVendor advisory
  68. 2026-09-12 11:31 UTCGHSA enrichment
  69. 2026-09-12 07:18 UTCVendor advisory
  70. 2026-09-12 07:18 UTCGHSA enrichment
  71. 2026-09-12 03:05 UTCVendor advisory
  72. 2026-09-12 03:04 UTCGHSA enrichment
  73. 2026-09-11 22:52 UTCVendor advisory
  74. 2026-09-11 22:52 UTCGHSA enrichment
  75. 2026-09-11 18:49 UTCCISA KEV update

Publicly available exploits

(1 reference)

Working exploit code is in the public domain (1 GitHub PoC). Defenders should treat patch urgency accordingly — public PoCs typically lead to mass-exploitation within 24-72 hours.

  • GitHub PoCSeanHeelan/claude_opus_cve_2023_0266
    First seen Mar 10, 2024

    Demo showing Claude Opus does not find CVE-2023-0266

    Open source ↗

Frequently asked(6)

What is CVE-2023-0266?
CVE-2023-0266 is a critical vulnerability published on January 30, 2023. A use after free vulnerability exists in the ALSA PCM package in the Linux Kernel. SNDRVCTLIOCTLELEM{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…
When was CVE-2023-0266 disclosed?
CVE-2023-0266 was first published in the National Vulnerability Database on January 30, 2023, with the most recent update on October 24, 2025. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2023-0266 actively exploited?
Yes. CISA added CVE-2023-0266 to the Known Exploited Vulnerabilities catalog on March 30, 2023, affecting Linux Kernel. KEV listing indicates confirmed exploitation in the wild; this CVE warrants immediate patching attention.
What is the CVSS score of CVE-2023-0266?
CVE-2023-0266 has a CVSS v3 base score of 7.9 (NVD). EchelonGraph synthesises NVD + CISA KEV + FIRST EPSS + GHSA into a combined EG score of 9.0.
Which products are affected by CVE-2023-0266?
CVE-2023-0266 affects Linux Kernel. The full affected-products list, including version ranges and fixed versions, is shown in the Affected Packages section of this page.
How do I remediate CVE-2023-0266?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2023-0266, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

See which npm, PyPI, Go, and Maven packages are affected by CVE-2023-0266

Explore →

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