VulnerabilityPublished 22 Aug 2026Updated 21 Oct 2026

CVE-2026-74600: Linux kernel · mm/page_table_check: skip special zero mappings

Affects Linux kernelSource CVE Database V5

Not known to be exploited · fixed in f6cf9832e677ec07b1675782bd2bad472cfd3cdc : update Linux kernel when convenient.

Data as of 26 Oct 2026, 14:05 UTC

Severity

Unrated

Rated by Threat Radar · CVSS not yet scored by NVD

EPSS: 0.1% chance of exploitation in 30 days – higher than 6% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch: Available – fixed in f6cf9832e677ec07b1675782bd2bad472cfd3cdc, b726eb3c94d23e09da0e0f46b0fa09fb2b5d99cc, 7755be923e325dc300f4b0c3e1ad7e91b28b3cb9 +2

Exploitation evidence

Disclosed: evidence found.
CVE published 22 Aug 2026
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 ≥ df4e817b710809425d899340dbfa8504a3ca4ba5, < f6cf9832e677ec07b1675782bd2bad472cfd3cdc	Fixed in f6cf9832e677ec07b1675782bd2bad472cfd3cdc
LinuxLinux	Affected ≥ df4e817b710809425d899340dbfa8504a3ca4ba5, < b726eb3c94d23e09da0e0f46b0fa09fb2b5d99cc	Fixed in b726eb3c94d23e09da0e0f46b0fa09fb2b5d99cc
LinuxLinux	Affected ≥ df4e817b710809425d899340dbfa8504a3ca4ba5, < 7755be923e325dc300f4b0c3e1ad7e91b28b3cb9	Fixed in 7755be923e325dc300f4b0c3e1ad7e91b28b3cb9
LinuxLinux	Affected ≥ df4e817b710809425d899340dbfa8504a3ca4ba5, < 51e16e5adadaa78b56f31a1cb02eb7267787625e	Fixed in 51e16e5adadaa78b56f31a1cb02eb7267787625e
LinuxLinux	Affected ≥ df4e817b710809425d899340dbfa8504a3ca4ba5, < 8db4bab826ccc9ec10fa41736a48031cd338d392	Fixed in 8db4bab826ccc9ec10fa41736a48031cd338d392
LinuxLinux	Affected =5.17	Fixed in–

Description

In the Linux kernel, the following vulnerability has been resolved: mm/page_table_check: skip special zero mappings page_table_check_set() and page_table_check_clear() account mappings based on PageAnon(). Shared zero-page PTEs and huge zero PMDs are special mappings, but page_table_check can still account them as file-backed pages. An unprivileged process can populate enough zero mappings to overflow file_map_count and hit the existing BUG_ON(). The PTE path can do this with the shared zero page, and the PMD path can do the same with huge zero mappings. Skip special zero mappings in the user page-table accounting paths. Keep the PTE-side pte_special() check, and identify huge zero PMDs from the mapped folio instead of pmd_special(). That covers architectures where pmd_special() is a no-op without adding huge_zero_pfn checks to the generic counter helpers.

References

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