CVE-2026-46331: net/sched: fix pedit partial COW leading to page cache corruption

highCVSS 8.1CVE-2026-46331

CSIRTS triage

vendor: Linux product: net/schedOther

What: A partial copy-on-write (COW) issue leads to page cache corruption.
Who is affected: Deployments using net/sched are affected.
Urgency: Remediation is urgent due to high severity and potential for exploitation.
Action: Update to the patched version for CVE-2026-46331.

AI-assisted analysis generated from the source advisory — verify against the original.

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Details

Source: Microsoft Security Response Center (INTL · vendor-psirt · site)
Severity: high — CVSS 8.1
Published: 2026-06-09
Exploitation: Not in CISA KEV at last sync

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-46331

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Low exploitation riskCVE-2026-463310.32% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 24% of all scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2026-46331	coverage & exploitation status	NVD · CVE.org

Same CVEs, other sources

How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.

high[UPDATE] [high] Linux Kernel: Vulnerability allows privilege escalationcert-bund
unknownMultiple vulnerabilities in Red Hat Linux kernel (July 10, 2026)cert-fr-avis
unknownMultiple vulnerabilities in Red Hat Linux kernel (July 3, 2026)cert-fr-avis
unknownRedHat Linux Kernel Multiple Vulnerabilitieshkcert
unknownDebian Linux Kernel Multiple Vulnerabilitieshkcert
unknownMultiple vulnerabilities in the Debian Linux kernel (June 26, 2026)cert-fr-avis
unknownMultiple vulnerabilities in the Red Hat Linux kernel (June 26, 2026)cert-fr-avis
unknownDSA-6355-1 linux - security updatedebian

Recent advisories for net/sched

A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.

highCVE-2026-46319: net/sched: act_ct: Only release RCU read lock after ct_ftmsrc · 2026-06-09
highCVE-2026-53011: net/sched: taprio: fix use-after-free in advance_sched() on schedule switchmsrc · 2026-06-09
mediumCVE-2026-52984: net/sched: netem: fix queue limit check to include reordered packetsmsrc · 2026-06-09
highCVE-2026-53264: net/sched: act_api: use RCU with deferred freeing for action lifecyclemsrc · 2026-06-09
mediumCVE-2026-53080: net/sched: cls_fw: fix NULL dereference of "old" filters before change()msrc · 2026-06-09