VulnerabilityPublished 24 Jun 2026Updated 6 Nov 2026

CVE-2026-52994: Linux kernel · vsock/virtio: fix MSG_ZEROCOPY pinned-pages accounting

Affects Linux kernelSource CVE Database V5

Compare

Not known to be exploited · fixed in d0117950075f0a9d5944980784c719d8ebcd4bff : update Linux kernel when convenient.

Data as of 6 Nov 2026, 16:49 UTC

Severity

Unrated

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

Thin evidence

One scorer or none

Exploitation: No evidence of active exploitation and no public proof of concept
Automatable: Attackers cannot reliably automate steps 1–4 of the kill chain
Technical impact: Limited control over the software or limited information exposure

CISA SSVC assessment, 2026-11-06.

Patch

Available – fixed in d0117950075f0a9d5944980784c719d8ebcd4bff, 6af1736b5810bc8a4a43a8518530113f5a757dc1, 1cb36e252211506f51095fe7ced8286cc77b4c80

Exploitation evidence

Disclosed: evidence found.
CVE published 24 Jun 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: 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 6 Nov 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.
Weaponized: A Metasploit exploit module or Exploit-DB entry exists (Metasploit scanner modules do not count), 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 d0117950075f0a9d5944980784c719d8ebcd4bff, 6af1736b5810bc8a4a43a8518530113f5a757dc1 or 1cb36e252211506f51095fe7ced8286cc77b4c80.

Affected software

Product	Affected	Fixed in
LinuxLinux	Affected ≥ 581512a6dc939ef122e49336626ae159f3b8a345, < d0117950075f0a9d5944980784c719d8ebcd4bff	Fixed in d0117950075f0a9d5944980784c719d8ebcd4bff
LinuxLinux	Affected ≥ 581512a6dc939ef122e49336626ae159f3b8a345, < 6af1736b5810bc8a4a43a8518530113f5a757dc1	Fixed in 6af1736b5810bc8a4a43a8518530113f5a757dc1
LinuxLinux	Affected ≥ 581512a6dc939ef122e49336626ae159f3b8a345, < 1cb36e252211506f51095fe7ced8286cc77b4c80	Fixed in 1cb36e252211506f51095fe7ced8286cc77b4c80
LinuxLinux	Affected =6.7	Fixed in–

Description

In the Linux kernel, the following vulnerability has been resolved: vsock/virtio: fix MSG_ZEROCOPY pinned-pages accounting virtio_transport_init_zcopy_skb() uses iter->count as the size argument for msg_zerocopy_realloc(), which in turn passes it to mm_account_pinned_pages() for RLIMIT_MEMLOCK accounting. However, this function is called after virtio_transport_fill_skb() has already consumed the iterator via __zerocopy_sg_from_iter(), so on the last skb, iter->count will be 0, skipping the RLIMIT_MEMLOCK enforcement. Pass pkt_len (the total bytes being sent) as an explicit parameter to virtio_transport_init_zcopy_skb() instead of reading the already-consumed iter->count. This matches TCP and UDP, which both call msg_zerocopy_realloc() with the original message size.

References

Community reviews

Loading reviews…