CVE-2022-47946 — An issue was discovered in the Linux kernel 5

An issue was discovered in the Linux kernel 5.10.x before 5.10.155. A use-after-free in io_sqpoll_wait_sq in fs/io_uring.c allows an attacker to crash the kernel, resulting in denial of service. finish_wait can be skipped. An attack can occur in some situations by forking a proce

01What is this vulnerability?

An issue was discovered in the Linux kernel 5.10.x before 5.10.155. A use-after-free in io_sqpoll_wait_sq in fs/io_uring.c allows an attacker to crash the kernel, resulting in denial of service. finish_wait can be skipped. An attack can occur in some situations by forking a process and then quickly terminating it. NOTE: later kernel versions, such as the 5.15 longterm series, substantially…

02Affected products

No structured affected-product list available — see references below for vendor advisories.

03Active exploitation status

Not currently listed on the CISA Known Exploited Vulnerabilities (KEV) catalog. EPSS is the best forward-looking signal — see the EPSS row above.

04Recommended remediation

• Patch to a fixed version listed in the vendor advisory (see references below).
• Mitigate with WAF rules, network egress filters, or feature flags where the patch is not yet available.
• Hunt historical logs for exploitation indicators — see Detection signatures below.

05Technical details

For the full vendor write-up, exploit chains, and reference implementations, see the references list in section 09.

06Detection signatures

Ask SARA in chat to draft a starting detection for this CVE in your stack of choice.

07Related CVEs

No directly-cited follow-up CVEs in the KB record for this advisory. The references list in section 09 carries the vendor cross-references.

08Timeline

• Published: 2022-12-23T22:15:08.773
• Last modified: 2026-10-14T19:16:55.997

09References

• www.openwall.com — http://www.openwall.com/lists/oss-security/2022/12/27/1
• git.kernel.org — https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?h=v5.10…
• www.openwall.com — https://www.openwall.com/lists/oss-security/2022/12/22/2
• www.openwall.com — http://www.openwall.com/lists/oss-security/2022/12/27/1
• git.kernel.org — https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?h=v5.10…
• www.openwall.com — https://www.openwall.com/lists/oss-security/2022/12/22/2
• cert-portal.siemens.com — https://cert-portal.siemens.com/productcert/html/ssa-794697.html