VulnerabilityPublished 11 Sep 2025Updated 21 Oct 2026

CVE-2025-39754: Linux kernel · mm/smaps: fix race between smaps_hugetlb_range and migration

Affects Linux kernelSource CVE Database V5

Not known to be exploited · fixed in f76089018b34dbe0c2e9b67c5b7d8860668748bb : update Linux kernel when convenient.

Data as of 26 Oct 2026, 14:18 UTC

Severity

Unrated

Rated by Threat Radar · No CVSS score from NVD or the CNA

EPSS: 0.1% chance of exploitation in 30 days – higher than 3% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch: Available – fixed in f76089018b34dbe0c2e9b67c5b7d8860668748bb, b625883ccbcc2b57808db51d1375b1d7b9bcb3e5, 45d19b4b6c2d422771c29b83462d84afcbb33f01 +2

Exploitation evidence

Disclosed: evidence found.
CVE published 11 Sep 2025
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 26 Oct 2026.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponised: Public exploit code exists in Metasploit or Exploit-DB, or CISA SSVC or the CVSS exploit maturity reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

What to do

Upgrade to a fixed release listed under Affected software.

Affected software

Product	Affected	Fixed in
LinuxLinux	Affected ≥ 25ee01a2fca02dfb5a3ce316e77910c468108199, < f76089018b34dbe0c2e9b67c5b7d8860668748bb	Fixed in f76089018b34dbe0c2e9b67c5b7d8860668748bb
LinuxLinux	Affected ≥ 25ee01a2fca02dfb5a3ce316e77910c468108199, < b625883ccbcc2b57808db51d1375b1d7b9bcb3e5	Fixed in b625883ccbcc2b57808db51d1375b1d7b9bcb3e5
LinuxLinux	Affected ≥ 25ee01a2fca02dfb5a3ce316e77910c468108199, < 45d19b4b6c2d422771c29b83462d84afcbb33f01	Fixed in 45d19b4b6c2d422771c29b83462d84afcbb33f01
LinuxLinux	Affected ≥ 25ee01a2fca02dfb5a3ce316e77910c468108199, < 09fc018f48871123ad5dbd7b03c956580232ed76	Fixed in 09fc018f48871123ad5dbd7b03c956580232ed76
LinuxLinux	Affected ≥ 25ee01a2fca02dfb5a3ce316e77910c468108199, < 2a1f3663974162b8f1e098196f557cfc1d160138	Fixed in 2a1f3663974162b8f1e098196f557cfc1d160138
LinuxLinux	Affected =4.4	Fixed in–

Description

In the Linux kernel, the following vulnerability has been resolved: mm/smaps: fix race between smaps_hugetlb_range and migration smaps_hugetlb_range() handles the pte without holdling ptl, and may be concurrenct with migration, leaing to BUG_ON in pfn_swap_entry_to_page(). The race is as follows. smaps_hugetlb_range migrate_pages huge_ptep_get remove_migration_ptes folio_unlock pfn_swap_entry_folio BUG_ON To fix it, hold ptl lock in smaps_hugetlb_range().

References

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