VulnerabilityPublished 15 Aug 2026Updated 21 Oct 2026

CVE-2026-74542: Linux kernel · netfs: Fix folio_queue ENOMEM in writeback by adding a mempool

Affects Linux kernelSource CVE Database V5

Not known to be exploited · fixed in b343252d6f536203dd0660f676190dcbf6d2ecdc : update Linux kernel when convenient.

Data as of 26 Oct 2026, 13:07 UTC

Severity

Unrated

Rated by Threat Radar · CVSS not yet scored by NVD

EPSS: 0.2% chance of exploitation in 30 days – higher than 10% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch: Available – fixed in b343252d6f536203dd0660f676190dcbf6d2ecdc, 15ed8a9b7c63e9171f5139a6aaa1ffb61809861f, 3f6d7f8a5416d852648d15a05e895f1195ee8a85 +1

Exploitation evidence

Disclosed: evidence found.
CVE published 15 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 Linux kernel to b343252d6f536203dd0660f676190dcbf6d2ecdc, 15ed8a9b7c63e9171f5139a6aaa1ffb61809861f, 3f6d7f8a5416d852648d15a05e895f1195ee8a85 or 1d78d56c43ef3768183e8370e7367b162700e049.

Affected software

Product	Affected	Fixed in
LinuxLinux	Affected ≥ cd0277ed0c188dd40e7744e89299af7b78831ca4, < b343252d6f536203dd0660f676190dcbf6d2ecdc	Fixed in b343252d6f536203dd0660f676190dcbf6d2ecdc
LinuxLinux	Affected ≥ cd0277ed0c188dd40e7744e89299af7b78831ca4, < 15ed8a9b7c63e9171f5139a6aaa1ffb61809861f	Fixed in 15ed8a9b7c63e9171f5139a6aaa1ffb61809861f
LinuxLinux	Affected ≥ cd0277ed0c188dd40e7744e89299af7b78831ca4, < 3f6d7f8a5416d852648d15a05e895f1195ee8a85	Fixed in 3f6d7f8a5416d852648d15a05e895f1195ee8a85
LinuxLinux	Affected ≥ cd0277ed0c188dd40e7744e89299af7b78831ca4, < 1d78d56c43ef3768183e8370e7367b162700e049	Fixed in 1d78d56c43ef3768183e8370e7367b162700e049
LinuxLinux	Affected =6.12	Fixed in–

Description

In the Linux kernel, the following vulnerability has been resolved: netfs: Fix folio_queue ENOMEM in writeback by adding a mempool Fix the handling of folio_queue allocation failure in writeback by adding a mempool and passing in gfp_t flags to the rolling buffer functions that allocate memory, using the mempool if gfp != GFP_KERNEL. This is then extended upwards and the gfp to be used for a request is stored in the netfs_io_request struct and is then used for both requests and subrequests, eliminating the sleeping loops there. The failure caused: folio != NULL WARNING: fs/netfs/write_issue.c:603 at netfs_writepages+0x883/0xa10 fs/netfs/write_issue.c:603, CPU#3: syz.0.17/5919

References

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