CVE-2026-64290: iommufd: Break the loop on failure in iommufd_fault_fops_read()
Vulnerability summary
CVE-2026-64290 is a medium (CVSS 5.5) Loop with Unreachable Exit Condition vulnerability in linux. EPSS estimates a 0.16% chance of exploitation in the next 30 days, higher than 5% of scored vulnerabilities.
Not severe (CVSS 5.5, local access); no exploitation reported by the 5 checked sources
Source freshness unavailable
How is this decided?Advisory lineage
Upstream 0 · Downstream 12 · Related 13Timeline
- 25-07-2026PublishedVulnerability first disclosed.
- 17-08-2026Last modifiedVulnerability information updated.
Description
In the Linux kernel, the following vulnerability has been resolved: iommufd: Break the loop on failure in iommufd_fault_fops_read() On a copy_to_user() failure inside the inner list_for_each_entry, only the inner loop breaks; the outer while re-fetches the just-restored fault group and retries the failing copy_to_user() forever, spinning the reader at 100% CPU with fault->mutex held. Check rc after the inner loop and break the outer while as well.
CVSS metrics
3 scores · 3 sources · 1 version- OSV · UbuntuEcosystem advisory · calculated5.5MediumCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- OSV · DebianEcosystem advisory · calculated5.5MediumCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
EPSS trend
Probability
0.16%
Chance of exploitation in the next 30 days
Percentile
5%
Versus all other CVEs
30-day change
No change 0.00 pp
From 0.16% 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 causeAffected systems
Known conditions: local access, low-privilege account, no user interaction (CVSS vector). Other conditions: not stated in public data.
Ubuntu119 products
- linux< 7.0.0-31.31
- linux-allwinner-5.19All versions (No fix recorded)
- linux-aws< 7.0.0-1012.12
- linux-aws-5.0All versions (No fix recorded)
- linux-aws-5.11All versions (No fix recorded)
Chainguard2 products
- linux-gcp-6.18< 6.18.44-r0
- linux-gcp-6.18-bootc< 6.18.44-r0
Debian2 products
- linux< 6.12.101-1 | < 7.1.4-1
- linux-6.12< 6.12.101-1~deb12u1
Linux2 products
- linux≥ 07838f7fd529c8a6de44b601d4b7057e6c8d36ed, < a38e0714affc5c0bbb40cba5a65d6d32a5e72a71 | ≥ 07838f7fd529c8a6de44b601d4b7057e6c8d36ed, < 5539da127d03c1f6c2e2a49fdfbe331a0ccbdea8 | ≥ 07838f7fd529c8a6de44b601d4b7057e6c8d36ed, < f66c16b175509642ee7082df57c9bf3deaebae1a | ≥ 07838f7fd529c8a6de44b601d4b7057e6c8d36ed, < 172fc8b19825a0f5884c38f2289188284e2d45ee | 6.11
- linux_kernel≥ 6.11, < 6.12.101 | ≥ 6.13, < 6.18.39 | ≥ 6.19, < 7.1.4
4 vendors · 125 products
