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Vulnerability · Published Jun 28, 2023 · Assigned by Google

CVE-2023-1295Privilege escalation with IO_RING_OP_CLOSE in the Linux Kernel

High 7.8

In plain English

A high-severity security flaw in Linux Kernel from Linux. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 12% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)7.8High
Exploit odds (30 days)0.2%top 87.6% of all CVEs
Exploited in the wildNo reportsnot in CISA KEV
Attack toolingNoneno public tooling known

Official description

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.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Debian:12linux5.14.6-1DEBIAN-CVE-2023-1295
Debian:13linux5.14.6-1DEBIAN-CVE-2023-1295
Debian:14linux5.14.6-1DEBIAN-CVE-2023-1295
Ubuntu:22.04:LTSlinux-azure-5.19no fix listedUBUNTU-CVE-2023-1295
Ubuntu:22.04:LTSlinux-azure-fde-5.19no fix listedUBUNTU-CVE-2023-1295
Ubuntu:22.04:LTSlinux-riscvno fix listedUBUNTU-CVE-2023-1295

Affected products (as reported)

VendorProductVersions
Linux Linux Kernel 5.6 – through 5.11

Weakness: CWE-367 · Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

References