CVE-2025-21724: iommufd/iova_bitmap: Fix shift-out-of-bounds in iova_bitmap_offset_to_index()
Vulnerability summary
CVE-2025-21724 is a high (CVSS 7.8) Out-of-bounds Write vulnerability in linux. EPSS estimates a 0.19% chance of exploitation in the next 30 days, higher than 8.7% of scored vulnerabilities.
Not severe (CVSS 7.8, local access); no exploitation reported by the 5 checked sources
Source freshness unavailable
How is this decided?Advisory lineage
Upstream 0 · Downstream 23 · Related 20Timeline
- 27-02-2025PublishedVulnerability first disclosed.
- 15-10-2026Last modifiedVulnerability information updated.
Description
In the Linux kernel, the following vulnerability has been resolved: iommufd/iova_bitmap: Fix shift-out-of-bounds in iova_bitmap_offset_to_index() Resolve a UBSAN shift-out-of-bounds issue in iova_bitmap_offset_to_index() where shifting the constant "1" (of type int) by bitmap->mapped.pgshift (an unsigned long value) could result in undefined behavior. The constant "1" defaults to a 32-bit "int", and when "pgshift" exceeds 31 (e.g., pgshift = 63) the shift operation overflows, as the result cannot be represented in a 32-bit type. To resolve this, the constant is updated to "1UL", promoting it to an unsigned long type to match the operand's type.
CVSS metrics
3 scores · 3 sources · 1 version- OSV · UbuntuEcosystem advisory · calculated7.8HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- OSV · DebianEcosystem advisory · calculated7.8HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
EPSS trend
Probability
0.19%
Chance of exploitation in the next 30 days
Percentile
9%
Versus all other CVEs
30-day change
No change 0.00 pp
From 0.19% 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.
Ubuntu106 products
- linux< 6.8.0-64.67
- linux-allwinner-5.19All versions (No fix recorded)
- linux-aws< 6.8.0-1032.34
- linux-aws-5.0All versions (No fix recorded)
- linux-aws-5.11All versions (No fix recorded)
Linux2 products
- linux≥ 58ccf0190d19d9a8a41f8a02b9e06742b58df4a1, < 44d9c94b7a3f29a3e07c4753603a35e9b28842a3 | ≥ 58ccf0190d19d9a8a41f8a02b9e06742b58df4a1, < 38ac76fc06bc6826a3e4b12a98efbe98432380a9 | ≥ 58ccf0190d19d9a8a41f8a02b9e06742b58df4a1, < d5d33f01b86af44b23eea61ee309e4ef22c0cdfe | ≥ 58ccf0190d19d9a8a41f8a02b9e06742b58df4a1, < b1f8453b8ff1ab79a03820ef608256c499769cb6 | ≥ 58ccf0190d19d9a8a41f8a02b9e06742b58df4a1, < e24c1551059268b37f6f40639883eafb281b8b9c | 6.1
- linux_kernel≥ 6.1, < 6.1.129 | ≥ 6.2, < 6.6.76 | ≥ 6.7, < 6.12.13 | ≥ 6.13, < 6.13.2
Debian1 product
- linux< 6.1.129-1 | < 6.12.13-1
3 vendors · 109 products
