CVE-2025-39727: mm: swap: fix potential buffer overflow in setup_clusters()
Vulnerability summary
CVE-2025-39727 is a high (CVSS 7.8) vulnerability in linux. EPSS estimates a 0.18% chance of exploitation in the next 30 days, higher than 7.1% 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 13 · Related 11Timeline
- 07-09-2025PublishedVulnerability first disclosed.
- 11-05-2026Last modifiedVulnerability information updated.
Description
In the Linux kernel, the following vulnerability has been resolved: mm: swap: fix potential buffer overflow in setup_clusters() In setup_swap_map(), we only ensure badpages are in range (0, last_page]. As maxpages might be < last_page, setup_clusters() will encounter a buffer overflow when a badpage is >= maxpages. Only call inc_cluster_info_page() for badpage which is < maxpages to fix the issue.
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
0.18%
Chance of exploitation in the next 30 days
Percentile
7%
Versus all other CVEs
30-day change
No change 0.00 pp
From 0.18% 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.
Ubuntu92 products
- linux-allwinner-5.19All versions (No fix recorded)
- linux-aws-5.0All versions (No fix recorded)
- linux-aws-5.11All versions (No fix recorded)
- linux-aws-5.13All versions (No fix recorded)
- linux-aws-5.19All versions (No fix recorded)
Linux2 products
- linux≥ b843786b0bd01ced7fcdbf3b033d68db2f7c61b2, < 91b370800b3f2b3dda244c0ab06719c4971190a5 | ≥ b843786b0bd01ced7fcdbf3b033d68db2f7c61b2, < 9b01ada580ee84fb319e7ecb5fb5b1f54a9eb799 | ≥ b843786b0bd01ced7fcdbf3b033d68db2f7c61b2, < 815c528b13f2bb9b3130c13bedeabf2351a68129 | ≥ b843786b0bd01ced7fcdbf3b033d68db2f7c61b2, < 152c1339dc13ad46f1b136e8693de15980750835 | 6.12
- linux_kernel≥ 6.12, < 6.12.42 | ≥ 6.13, < 6.15.10 | ≥ 6.16, < 6.16.1
Debian1 product
- linux< 6.12.43-1 | < 6.16.3-1
3 vendors · 95 products
