CVE-2023-1295 — A time-of-check to time-of-use issue exists in io_uring subsystem's IORING_OP_CL
A time-of-check to time-of-use issue exists in io_uring subsystem's IORING_OP_CLOSE operation in the Linux kernel's versions 5.6 - 5.11 (inclusive), which allows a local user to elevate their privileges to root. Introduced in b5dba59e0cf7e2cc4d3b3b1ac5fe81ddf21959eb, pa
Published
2023-06-28T11:08:54.348Z
Last modified
2025-02-13T16:39:20.773Z
CVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
01What is this vulnerability?
A time-of-check to time-of-use issue exists in io_uring subsystem's IORING_OP_CLOSE operation in the Linux kernel's versions 5.6 - 5.11 (inclusive), which allows a local user to elevate their privileges to root. Introduced in b5dba59e0cf7e2cc4d3b3b1ac5fe81ddf21959eb, patched in 9eac1904d3364254d622bf2c771c4f85cd435fc2, backported to stable in 788d0824269bef539fe31a785b1517882eafed93.
02Affected products
| Vendor | Product | Versions |
|---|
| Linux | Linux Kernel | 5.6 |
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: 2023-06-28T11:08:54.348Z
- Last modified: 2025-02-13T16:39:20.773Z
09References
- git.kernel.org — https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=9e…
- git.kernel.org — https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=788d…
- kernel.dance — https://kernel.dance/9eac1904d3364254d622bf2c771c4f85cd435fc2
- kernel.dance — https://kernel.dance/788d0824269bef539fe31a785b1517882eafed93
- git.kernel.org — https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=b5…
- security.netapp.com — https://security.netapp.com/advisory/ntap-20230731-0006/
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