CVE-2023-0266
Linux Kernel: Use-After-Free
As of , CVE-2023-0266 in Linux Kernel is on CISA's list of exploited vulnerabilities: CISA listed it on . Our patch-first group: Patch soon.
- Exploited
- Yes: CISA listed it on 30 March 2023
- US federal deadline
- 20 April 202321 days after CISA listed it. US federal civilian agencies must fix it by then.
- Used in ransomware campaigns
- Not known to CISA
- EPSS score
- 0.04Higher than 89% of the CVEs EPSS scores. EPSS estimates the chance of exploitation activity in the next 30 days.
- EPSS when listed
- 0.00 on 30 March 2023EPSS on the day CISA listed it.
- Public exploit
- None foundNeither Metasploit nor Exploit-DB lists one.
- Fix
- Vendor advice: git.kernel.orgLinks below, from CISA's entry.
What CISA says to do
Apply updates per vendor instructions.
CISA's required action
What the flaw is
Linux kernel contains a use-after-free vulnerability that allows for privilege escalation to gain ring0 access from the system user.
CISA's description
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
The CVE record's description, from Google
- CVE published
- 30 January 2023
- Assigned by
- CVSS
- 7.9 High (CVSS 3.1, from the CNA)
- CWE-416
- Use After Free
- CISA SSVC, exploitation
- active
- CISA SSVC, automatable
- no
- CISA SSVC, technical impact
- total
Timeline
- The CVE record was published.
- CISA added it to its list of exploited vulnerabilities.
- The US federal deadline to fix it.
Kernel: other exploited entries
| Vulnerability | Product | Our group | Listed | Deadline | EPSS |
|---|---|---|---|---|---|
| CVE-2025-39682Improper Check for Unusual or Exceptional Conditions | Linux Kernel | Patch nowForensic triage required by CISA | 0.03 | ||
| CVE-2025-39964Race Condition | Linux Kernel | Patch nowForensic triage required by CISA | 0.01 | ||
| CVE-2026-53266Out-of-Bounds Write | Linux Kernel | Patch nowForensic triage required by CISA | 0.01 | ||
| CVE-2026-53362Unspecified | Linux Kernel | Patch nowForensic triage required by CISA | 0.01 | ||
| CVE-2021-22555Heap Out-of-Bounds Write | Linux Kernel | Patch this weekMetasploit module; EPSS 0.79; verified Exploit-DB entry | 0.79 | ||
| CVE-2013-6282Improper Input Validation | Linux Kernel | Patch this weekMetasploit module; verified Exploit-DB entry | 0.40 | ||
| CVE-2019-13272Improper Privilege Management | Linux Kernel | Patch this weekMetasploit module; EPSS 0.52; verified Exploit-DB entry | 0.52 | ||
| CVE-2010-3904Improper Input Validation | Linux Kernel | Patch this weekMetasploit module; verified Exploit-DB entry | 0.16 | ||
| CVE-2022-0847Privilege Escalation | Linux Kernel | Patch this weekMetasploit module; EPSS 0.93 | 0.93 | ||
| CVE-2021-3493Privilege Escalation | Linux Kernel | Patch this weekMetasploit module | 0.49 |
Read further
- CVE recordcve.org
- NVD entrynvd.nist.gov
- CISA's catalogcisa.gov
- EPSS for this CVEapi.first.org