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Out-of-bounds Write The advisory has been revoked - it doesn't affect any version of package kernel-devel-rt  (opens in a new tab)

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EPSS
0.64% (49th percentile)

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  • Snyk IDSNYK-SLES152-KERNELDEVELRT-2678268
  • published14 Apr 2022
  • disclosed8 Jun 2021
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Introduced: 8 Jun 2021

CVE-2021-3491  (opens in a new tab)
CWE-787  (opens in a new tab)

Amendment

The SLES security team deemed this advisory irrelevant for SLES:15.2.

NVD Description

Note: Versions mentioned in the description apply only to the upstream kernel-devel-rt package and not the kernel-devel-rt package as distributed by SLES.

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).

References