CVE-2021-44733
HIGH
7
CVSS Score
Published: December 22, 2021 at 12:00 AM UTC
Updated: August 5, 2026 at 06:44 PM UTC
20 products affected across 5 vendorsLinux KernelDebian LinuxFedora
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Severity
HIGH7
Exploit prediction
EPSS 0.7%
Description
A use-after-free exists in drivers/tee/tee_shm.c in the TEE subsystem in the Linux kernel through 5.15.11. This occurs because of a race condition in tee_shm_get_from_id during an attempt to free a shared memory object.
Affected
Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.
Debian Linux· Debiandrupal
95%95%
4.12 ≤ v < 4.14.2614.15 ≤ v < 4.19.2244.20 ≤ v < 5.4.1705.11 ≤ v < 5.15.125.5 ≤ v < 5.10.89
Affected range stops below 4.14.261, so it looks safe — our inference, not a vendor statement
Affected range stops below 4.19.224, so it looks safe — our inference, not a vendor statement
Affected range stops below 5.10.89, so it looks safe — our inference, not a vendor statement
Affected range stops below 5.15.12, so it looks safe — our inference, not a vendor statement
Affected range stops below 5.4.170, so it looks safe — our inference, not a vendor statement
Remediation
No guide yetNo remediation guidance has been written for this CVE yet. What the record does show:
References (7)
ExploitThird Party Advisory
Source: [email protected]
https://github.com/pjlantz/optee-qemu/blob/main/README.mdMailing Listx_refsource_MLISTThird Party Advisory
Source: [email protected]
https://lists.debian.org/debian-lts-announce/2022/03/msg00012.htmlThird Party Advisory
Source: [email protected]
https://lore.kernel.org/lkml/20211215092501.1861229-1-jens.wiklander%40linaro.org/Third Party Advisory
Source: [email protected]
https://security.netapp.com/advisory/ntap-20220114-0003/Vendor Advisoryx_refsource_DEBIANThird Party Advisory
Source: [email protected]
https://www.debian.org/security/2022/dsa-5096CVSS
- Attack Vector
- LOCAL
- Complexity
- HIGH
- Privileges
- LOW
- User Interaction
- NONE
- Scope
- UNCHANGED
- Confidentiality
- HIGH
- Integrity
- HIGH
- Availability
- HIGH
Vector?
Quick Info
StatusANALYZED
CWE
CWE-362
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