CVE-2021-29648

MEDIUM

Linux Kernel < 5.11.11 - Denial of Service via Uninitialized BTF Data Access

Title source: llm

Description

An issue was discovered in the Linux kernel before 5.11.11. The BPF subsystem does not properly consider that resolved_ids and resolved_sizes are intentionally uninitialized in the vmlinux BPF Type Format (BTF), which can cause a system crash upon an unexpected access attempt (in map_create in kernel/bpf/syscall.c or check_btf_info in kernel/bpf/verifier.c), aka CID-350a5c4dd245.

References (5)

Core 5

Core References

Mailing List, Patch, Vendor Advisory x_refsource_misc

https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.11.11

Mailing List, Patch, Vendor Advisory x_refsource_misc

https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=350a5c4dd2452ea999cc5e1d4a8dbf12de2f97ef

Mailing List, Third Party Advisory vendor-advisory x_refsource_fedora

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/WKRNELXLVFDY6Y5XDMWLIH3VKIMQXLLR/

Mailing List, Third Party Advisory vendor-advisory x_refsource_fedora

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/RZGMUP6QEHJJEKPMLKOSPWYMW7PXFC2M/

Mailing List, Third Party Advisory vendor-advisory x_refsource_fedora

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/VTADK5ELGTATGW2RK3K5MBJ2WGYCPZCM/

Scores

CVSS v3 5.5

EPSS 0.0028

EPSS Percentile 19.9%

Attack Vector LOCAL

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Details

CWE

CWE-307

Status published

Products (4)

fedoraproject/fedora 32

fedoraproject/fedora 33

fedoraproject/fedora 34

linux/linux_kernel < 5.11.11

Published Mar 30, 2021

Tracked Since Feb 18, 2026