QID 352375

<DIV ID="issue_overview"> an issue was discovered in the linux kernel related to mm/gup.c and mm/huge_memory.c.
The get_user_pages (aka gup) implementation, when used for a copy-on-write page, does not properly consider the semantics of read operations and therefore can grant unintended write access. (
cve-2020-29374 ) a use-after-free flaw was found in the linux kernel's sctp socket functionality that triggers a race condition.
This flaw allows a local user to escalate their privileges on the system.
The highest threat from this vulnerability is to confidentiality, integrity, as well as system availability. (
cve-2021-23133 ) a vulnerability was discovered in retrieve_ptr_limit in kernel/bpf/verifier.c in the linux kernel mechanism to mitigate speculatively out-of-bounds loads (spectre mitigation).
In this flaw a local, special user privileged (cap_sys_admin) bpf program running on affected systems may bypass the protection, and execute speculatively out-of-bounds loads from the kernel memory.
This can be abused to extract contents of kernel memory via side-channel. (
cve-2021-29155 ) a flaw was found in the linux kernel's ebpf verification code.
By default, accessing the ebpf verifier is only accessible to privileged users with cap_sys_admin.
This flaw allows a local user who can insert ebpf instructions, to use the ebpf verifier to abuse a spectre-like flaw and infer all system memory.
The highest threat from this vulnerability is to confidentiality. (
cve-2021-31829 ) </DIV>

Note: The preceding description block is extracted directly from the security advisory. Using automation, we have attempted to clean and format it as much as possible without introducing additional issues.

Allows unauthorized disclosure of information; allows unauthorized modification; allows disruption of service.