CVE-2021-3491: fallo de gravedad alta en Linux kernel
Linux kernel io_uring PROVIDE_BUFFERS MAX_RW_COUNT bypass
Publicada el · Actualizada el
21Vexday Risk Score
Sin señal de explotación. Ningún artefacto público de explotación conocido hasta ahora.
ssvc Trackcvss 7.8epss 0.6%
probabilidad de explotación
0.6%top 50% de las CVE
explotación observada
noninguna fuente lo reporta
The io_uring subsystem in the Linux kernel allowed the MAX_RW_COUNT limit to be bypassed in the PROVIDE_BUFFERS operation, which led to negative values being usedin mem_rw when reading /proc/<PID>/mem. This could be used to create a heap overflow leading to arbitrary code execution in the kernel. It was addressed via commit d1f82808877b ("io_uring: truncate lengths larger than MAX_RW_COUNT on provide buffers") (v5.13-rc1) and backported to the stable kernels in v5.12.4, v5.11.21, and v5.10.37. It was introduced in ddf0322db79c ("io_uring: add IORING_OP_PROVIDE_BUFFERS") (v5.7-rc1).
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H
Productos afectados
Linux · Linux kernelCVEs relacionadas — Linux kernel
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Referencias
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=d1f82808877bb10d3deee7cf3374a4eb3fb582dbhttps://security.netapp.com/advisory/ntap-20210716-0004/https://ubuntu.com/security/notices/USN-4949-1https://ubuntu.com/security/notices/USN-4950-1https://www.openwall.com/lists/oss-security/2021/05/11/13https://www.zerodayinitiative.com/advisories/ZDI-21-589/