Fedora 33: FEDORA-2021-05152dbcf5 Critical Kernel Security Fixes

The kernel meta package

The 5.11.20 stable kernel update contains a number of important fixes across the

tree.

* Wed May 12 2021 Justin M. Forbes [5.11.20-0]

- io_uring: truncate lengths larger than MAX_RW_COUNT on provide buffers (Thadeu Lima de Souza Cascardo)

- bpf: Prevent writable memory-mapping of read-only ringbuf pages (Andrii Nakryiko)

- bpf, ringbuf: Deny reserve of buffers larger than ringbuf (Thadeu Lima de Souza Cascardo)

- bpf: Fix alu32 const subreg bound tracking on bitwise operations (Daniel Borkmann)

- net/nfc: fix use-after-free llcp_sock_bind/connect (Or Cohen)

[ 1 ] Bug #1959514 - CVE-2021-23134 kernel: use-after-free in nfc sockets

https://bugzilla.redhat.com/show_bug.cgi?id=1959514

[ 2 ] Bug #1959556 - CVE-2021-3490 kernel: Linux kernel eBPF bitwise ops ALU32 bounds tracking

https://bugzilla.redhat.com/show_bug.cgi?id=1959556

[ 3 ] Bug #1959559 - CVE-2021-3489 kernel: Linux kernel eBPF RINGBUF map oversized allocation

https://bugzilla.redhat.com/show_bug.cgi?id=1959559

[ 4 ] Bug #1959565 - CVE-2021-3491 kernel: Linux kernel io_uring PROVIDE_BUFFERS MAX_RW_COUNT bypass

https://bugzilla.redhat.com/show_bug.cgi?id=1959565

su -c 'dnf upgrade --advisory FEDORA-2021-05152dbcf5' at the command

line. For more information, refer to the dnf documentation available at

https://dnf.readthedocs.io/en/latest/command_ref.html

All packages are signed with the Fedora Project GPG key. More details on the

GPG keys used by the Fedora Project can be found at

https://fedoraproject.org/security/

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