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CVE-2025-39727— mm: swap: fix potential buffer overflow in setup_clusters()

Quick assessment

Affected
Linux Linux
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于未正确检查坏页范围，可能导致缓冲区溢出。

AI Predicted 7.8 Difficulty: Hard EPSS 0.18% · P7

Possible ATT&CK Techniques 1 AI

T1068 · Exploitation for Privilege Escalation

Affected Version Matrix 10

VendorProduct Version RangeStatus
Linux Linux b843786b0bd01ced7fcdbf3b033d68db2f7c61b2< 91b370800b3f2b3dda244c0ab06719c4971190a5 affected
b843786b0bd01ced7fcdbf3b033d68db2f7c61b2< 9b01ada580ee84fb319e7ecb5fb5b1f54a9eb799 affected
b843786b0bd01ced7fcdbf3b033d68db2f7c61b2< 815c528b13f2bb9b3130c13bedeabf2351a68129 affected
b843786b0bd01ced7fcdbf3b033d68db2f7c61b2< 152c1339dc13ad46f1b136e8693de15980750835 affected
6.12 affected
< 6.12 unaffected
6.12.42≤ 6.12.* unaffected
6.15.10≤ 6.15.* unaffected
… +2 more rows
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I. Basic Information for CVE-2025-39727

Vulnerability Information
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Vulnerability Title
mm: swap: fix potential buffer overflow in setup_clusters()
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于未正确检查坏页范围，可能导致缓冲区溢出。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux b843786b0bd01ced7fcdbf3b033d68db2f7c61b2 ~ 91b370800b3f2b3dda244c0ab06719c4971190a5 -
Linux Linux 6.12 -

II. Public POCs for CVE-2025-39727

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III. Intelligence Information for CVE-2025-39727

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Same Patch Batch · Linux · 2025-09-07 · 7 CVEs total

CVE-2025-39732 7.8 HIGH wifi: ath11k: fix sleeping-in-atomic in ath11k_mac_op_set_bitrate_mask()
CVE-2025-39734 Revert "fs/ntfs3: Replace inode_trylock with inode_lock"
CVE-2025-39733 team: replace team lock with rtnl lock
CVE-2025-39731 f2fs: vm_unmap_ram() may be called from an invalid context
CVE-2025-39729 crypto: ccp - Fix dereferencing uninitialized error pointer
CVE-2025-39730 NFS: Fix filehandle bounds checking in nfs_fh_to_dentry()

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2025-39727

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