CVE-2021-46953: ACPI: GTDT: Don't corrupt interrupt mappings on watchdow probe failure
Vulnerability summary
CVE-2021-46953 is a medium (CVSS 6.7) vulnerability in linux. EPSS estimates a 0.24% chance of exploitation in the next 30 days, higher than 15.3% of scored vulnerabilities.
Not severe (CVSS 6.7, local access); no exploitation reported by the 5 checked sources
Source freshness unavailable
How is this decided?Advisory lineage
Upstream 0 · Downstream 6 · Related 6Timeline
- 27-02-2024PublishedVulnerability first disclosed.
- 11-05-2026Last modifiedVulnerability information updated.
Description
In the Linux kernel, the following vulnerability has been resolved: ACPI: GTDT: Don't corrupt interrupt mappings on watchdow probe failure When failing the driver probe because of invalid firmware properties, the GTDT driver unmaps the interrupt that it mapped earlier. However, it never checks whether the mapping of the interrupt actially succeeded. Even more, should the firmware report an illegal interrupt number that overlaps with the GIC SGI range, this can result in an IPI being unmapped, and subsequent fireworks (as reported by Dann Frazier). Rework the driver to have a slightly saner behaviour and actually check whether the interrupt has been mapped before unmapping things.
CVSS metrics
3 scores · 3 sources · 1 version- OSV · UbuntuEcosystem advisory · calculated6.7MediumCVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
- OSV · DebianEcosystem advisory · calculated6.7MediumCVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
EPSS trend
Probability
0.24%
Chance of exploitation in the next 30 days
Percentile
15%
Versus all other CVEs
30-day change
No change 0.00 pp
From 0.24% on 04-10-2026
Known exploited
Compare KEV catalogs
CISA KEVNot in the CISA KEV catalog.
ENISA CNWNot in the ENISA CNW catalog.
CIRCLNot in the CIRCL catalog.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeNo weakness data has been published for this record.
Affected systems
Known conditions: local access, administrative account, no user interaction (CVSS vector). Other conditions: not stated in public data.
Ubuntu85 products
- linux< 4.15.0-151.157 | < 5.4.0-77.86
- linux-allwinner-5.19All versions (No fix recorded)
- linux-aws< 4.15.0-1109.116 | < 5.4.0-1051.53
- linux-aws-5.0All versions (No fix recorded)
- linux-aws-5.11All versions (No fix recorded)
Linux2 products
- linux≥ ca9ae5ec4ef0ed13833b03297ab319676965492c, < c3385a9122f8db15b453e07bfc88117fce7f3724 | ≥ ca9ae5ec4ef0ed13833b03297ab319676965492c, < 7b2162db1498c71962a4bb2f776fa4e76d4d305b | ≥ ca9ae5ec4ef0ed13833b03297ab319676965492c, < 504632a3577a049dd9bb7aabae5b4476f9c586b4 | ≥ ca9ae5ec4ef0ed13833b03297ab319676965492c, < e0f2d86481eaa83df33b0793f75212919db7a19d | ≥ ca9ae5ec4ef0ed13833b03297ab319676965492c, < 42e69521ee1fa5abf21f478d147d06bbfe6bf6a8 | ≥ ca9ae5ec4ef0ed13833b03297ab319676965492c, < 596e079c362ac17ed02aa1b99fdc444d62072a01 | ≥ ca9ae5ec4ef0ed13833b03297ab319676965492c, < 1ecd5b129252249b9bc03d7645a7bda512747277 | 4.12
- linux_kernel≥ 4.12.0, < 4.14.233 | ≥ 4.15.0, < 4.19.191 | ≥ 4.20.0, < 5.4.118 | ≥ 5.5.0, < 5.10.36 | ≥ 5.11.0, < 5.11.20 | ≥ 5.12.0, < 5.12.3
Debian1 product
- linux< 5.10.38-1
3 vendors · 88 products
