VulnerabilityPublished 24 Jun 2026Updated 6 Nov 2026

CVE-2026-52985: Linux kernel · netdevsim: zero initialize struct iphdr in dummy sk_buff

Affects Linux kernelSource CVE Database V5

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Not known to be exploited · fixed in bc6002865e8c4fcf9e94975f7cf023448d8764e2 : 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 bc6002865e8c4fcf9e94975f7cf023448d8764e2, 175556c049eaec14efde8c6475e763b7579b9de7, 978ca6ff789f1f19c03288ac20cc1f4774e88490 +5

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 to a fixed release listed under Affected software.

Affected software

Product	Affected	Fixed in
LinuxLinux	Affected ≥ da58f90f11f597520f226caff1d3cfc115abedc9, < bc6002865e8c4fcf9e94975f7cf023448d8764e2	Fixed in bc6002865e8c4fcf9e94975f7cf023448d8764e2
LinuxLinux	Affected ≥ da58f90f11f597520f226caff1d3cfc115abedc9, < 175556c049eaec14efde8c6475e763b7579b9de7	Fixed in 175556c049eaec14efde8c6475e763b7579b9de7
LinuxLinux	Affected ≥ da58f90f11f597520f226caff1d3cfc115abedc9, < 978ca6ff789f1f19c03288ac20cc1f4774e88490	Fixed in 978ca6ff789f1f19c03288ac20cc1f4774e88490
LinuxLinux	Affected ≥ da58f90f11f597520f226caff1d3cfc115abedc9, < 818f7673ed7f4a29d4b9cee8184c47d6e57162b4	Fixed in 818f7673ed7f4a29d4b9cee8184c47d6e57162b4
LinuxLinux	Affected ≥ da58f90f11f597520f226caff1d3cfc115abedc9, < 750d0091bebf44975421268d37484ef87060d263	Fixed in 750d0091bebf44975421268d37484ef87060d263
LinuxLinux	Affected ≥ da58f90f11f597520f226caff1d3cfc115abedc9, < 35eaa6d8d6c2ee65e96f507add856e0eacf24591	Fixed in 35eaa6d8d6c2ee65e96f507add856e0eacf24591

Description

In the Linux kernel, the following vulnerability has been resolved: netdevsim: zero initialize struct iphdr in dummy sk_buff Syzbot reports a KMSAN uninit-value originating from nsim_dev_trap_skb_build, with the allocation also being performed in the same function. Fix this by calling skb_put_zero instead of skb_put to guarantee zero initialization of the whole IP header.

References

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