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
Link | Resource |
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https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=d1f82808877bb10d3deee7cf3374a4eb3fb582db | Patch Vendor Advisory |
https://security.netapp.com/advisory/ntap-20210716-0004/ | Third Party Advisory |
https://ubuntu.com/security/notices/USN-4949-1 | Third Party Advisory |
https://ubuntu.com/security/notices/USN-4950-1 | Third Party Advisory |
https://www.openwall.com/lists/oss-security/2021/05/11/13 | Mailing List Patch Third Party Advisory |
https://www.zerodayinitiative.com/advisories/ZDI-21-589/ | Third Party Advisory VDB Entry |
Configurations
Configuration 1 (hide)
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Configuration 2 (hide)
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History
14 Sep 2021, 14:31
Type | Values Removed | Values Added |
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References |
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11 Jun 2021, 19:12
Type | Values Removed | Values Added |
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CWE | CWE-787 | |
CPE | cpe:2.3:o:canonical:ubuntu_linux:20.10:*:*:*:*:*:*:* cpe:2.3:o:canonical:ubuntu_linux:20.04:*:*:*:lts:*:*:* cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* cpe:2.3:o:canonical:ubuntu_linux:21.04:*:*:*:*:*:*:* |
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References | (UBUNTU) https://ubuntu.com/security/notices/USN-4949-1 - Third Party Advisory | |
References | (MISC) https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=d1f82808877bb10d3deee7cf3374a4eb3fb582db - Patch, Vendor Advisory | |
References | (UBUNTU) https://ubuntu.com/security/notices/USN-4950-1 - Third Party Advisory | |
References | (MLIST) https://www.openwall.com/lists/oss-security/2021/05/11/13 - Mailing List, Patch, Third Party Advisory | |
References | (MISC) https://www.zerodayinitiative.com/advisories/ZDI-21-589/ - Third Party Advisory, VDB Entry | |
CVSS |
v2 : v3 : |
v2 : 7.2
v3 : 8.8 |
04 Jun 2021, 02:15
Type | Values Removed | Values Added |
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New CVE |
Information
Published : 2021-06-04 02:15
Updated : 2023-12-10 13:55
NVD link : CVE-2021-3491
Mitre link : CVE-2021-3491
CVE.ORG link : CVE-2021-3491
JSON object : View
Products Affected
linux
- linux_kernel
canonical
- ubuntu_linux