8.8

CVE-2025-38688: iommufd: Prevent ALIGN() overflow

Modified
AliasesUBUNTU-CVE-2025-38688DEBIAN-CVE-2025-38688
Published 04-09-2025Last modified 15-10-2026

Vulnerability summary

CVE-2025-38688 is a high (CVSS 8.8) vulnerability in linux. EPSS estimates a 0.17% chance of exploitation in the next 30 days, higher than 6.2% of scored vulnerabilities.

Priority
Routine

Not severe (CVSS 8.8, local access); no exploitation reported by the 5 checked sources

Source freshness unavailable

How is this decided?
CVSS score
8.8/10
010
High · v3.1 (CVE.org)
EPSS score
0.17%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 18 · Related 16
MGASA-2025-0234MGASA-2025-0235USN-8028-1USN-8028-2USN-8028-3USN-8028-4

Timeline

  1. 04-09-2025
    PublishedVulnerability first disclosed.
  2. 15-10-2026
    Last modifiedVulnerability information updated.

Description

In the Linux kernel, the following vulnerability has been resolved: iommufd: Prevent ALIGN() overflow When allocating IOVA the candidate range gets aligned to the target alignment. If the range is close to ULONG_MAX then the ALIGN() can wrap resulting in a corrupted iova. Open code the ALIGN() using get_add_overflow() to prevent this. This simplifies the checks as we don't need to check for length earlier either. Consolidate the two copies of this code under a single helper. This bug would allow userspace to create a mapping that overlaps with some other mapping or a reserved range.

CVSS metrics

5 scores · 4 sources · 2 versions

EPSS trend

Probability

0.17%

Chance of exploitation in the next 30 days

Percentile

6%

Versus all other CVEs

30-day change

No change 0.00 pp

From 0.17% on 04-10-2026

04-10-202603-11-2026

Known exploited

Compare KEV catalogs
CISA KEV

Not in the CISA KEV catalog.

ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

No weakness data has been published for this record.

Affected systems

Version check

Known conditions: local access, low-privilege account, no user interaction (CVSS vector). Other conditions: not stated in public data.

Ubuntu122 products
  • linux< 6.8.0-100.100
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-aws< 6.8.0-1046.49
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
Linux2 products
  • linux≥ 51fe6141f0f64ae0bbc096a41a07572273e8c0ef, < d19b817540c0abe84854a64ee9ee34cecc3bbeef | ≥ 51fe6141f0f64ae0bbc096a41a07572273e8c0ef, < ebb6021560b94649bec6b8faba6fe0dca2218e81 | ≥ 51fe6141f0f64ae0bbc096a41a07572273e8c0ef, < e42a046bb41dcdde4f766a17d8211842007ed537 | ≥ 51fe6141f0f64ae0bbc096a41a07572273e8c0ef, < 79fad1917802c28de51a479318a056a6fbe3e2f2 | ≥ 51fe6141f0f64ae0bbc096a41a07572273e8c0ef, < b42497e3c0e74db061eafad41c0cd7243c46436b | 6.2
  • linux_kernel≥ 6.2, < 6.6.103 | ≥ 6.7, < 6.12.43 | ≥ 6.13, < 6.15.11 | ≥ 6.16, < 6.16.2
Debian1 product
  • linux< 6.12.43-1 | < 6.16.3-1

3 vendors · 125 products

References

25 links
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