Use After Free in Arm Bifrost GPU Kernel Driver
CVE-2021-29256
. The Arm Mali GPU kernel driver allows an unprivileged user to achieve access to freed memory, leading to information disclosure or root privilege escalation. This affects Bifrost r16p0 through r29p0 before r30p0, Valhall r19p0 through r29p0 before r30p0, and Midgard r28p0 through r30p0.
Vulnerability class: Use-After-Free
Published · last modified .
CVSS v3 metric
CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.030 (87.1th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 87th percentile — 87.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.030 · newest: 0.030 · change: 0.000
Affected products
Weakness classification (CWE)
CISA KEV (Known Exploited Vulnerabilities)
This CVE is on the CISA KEV catalog, added on . CISA KEV inclusion means CISA has confirmed in-the-wild exploitation; US federal agencies are required to remediate within a published due date.
BOD 22-01 due date: .
Required action: Apply updates per vendor instructions or discontinue use of the product if updates are unavailable.
Public proof-of-concept exploits
References
- developer.arm.com/support/arm-security-updates/mali-gpu-kernel-driver (Vendor Advisory)
- 134c704f-9b21-4f2e-91b3-4a467353bcc0 (US Government Resource)
Frequently asked questions
- What is CVE-2021-29256?
- CVE-2021-29256 is a high-severity vulnerability in Arm Bifrost GPU Kernel Driver, classified under Use After Free. CVSS score: 8.8/10. Published 2021-05-24.
- How severe is CVE-2021-29256?
- High severity. CVSS v3 base score is 8.8 out of 10.
- Is CVE-2021-29256 known to be exploited?
- Yes. CVE-2021-29256 is listed in the CISA Known Exploited Vulnerabilities catalog (added 2023-07-07), indicating it is being actively exploited. 3 public proof-of-concept repositories are indexed.