CVE-2021-33624CWE-843

CVE-2021-33624

Medium · published June 23, 2021

CVSS v3.1
4.7
EPSS
1%
Percentile
60.0
In the wild
Unconfirmed
What it is

In kernel/bpf/verifier.c in the Linux kernel before 5.12.13, a branch can be mispredicted (e.g., because of type confusion) and consequently an unprivileged BPF program can read arbitrary memory locations via a side-channel attack, aka CID-9183671af6db.

The record
Technical detail
CVSS v3.1
4.7 · MEDIUM
Vector
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N
CVSS v4.0
Not supplied
EPSS
0.00922 · 60.0th percentile
Weakness
CWE-843 · Access of Resource Using Incompatible Type ('Type Confusion')
Published
2021-06-23T20:15Z
Affected products (2)
ProductVersionsFixed in
linux/linux_kernel< 5.12.135.12.13
debian/debian_linuxall versions—
References (9)
http://www.openwall.com/lists/oss-security/2021/06/21/1 · [email protected]https://github.com/benschlueter/CVE-2021-33624 · [email protected]https://github.com/torvalds/linux/commit/9183671af6dbf60a1219371d4ed73e23f43b49db · [email protected]https://lists.debian.org/debian-lts-announce/2021/10/msg00010.html · [email protected]https://www.usenix.org/conference/usenixsecurity21/presentation/kirzner · [email protected]http://www.openwall.com/lists/oss-security/2021/06/21/1 · af854a3a-2127-422b-91ae-364da2661108https://github.com/torvalds/linux/commit/9183671af6dbf60a1219371d4ed73e23f43b49db · af854a3a-2127-422b-91ae-364da2661108https://lists.debian.org/debian-lts-announce/2021/10/msg00010.html · af854a3a-2127-422b-91ae-364da2661108https://www.usenix.org/conference/usenixsecurity21/presentation/kirzner · af854a3a-2127-422b-91ae-364da2661108
EPSS history
Timeline
  • 23 JUN 15:37Z
    In kernel/bpf/verifier.c in the Linux kernel before 5.12.13, a branch can be mispredicted (e.g., because of type confusion) and consequently an unprivileged…
    cvelistv5