Medium 5.5Published Jun 24, 2026

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

Updated under an hour ago (Oct 27, 2026, 8:00 AM ET)

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No exploitation reported and no EPSS estimate yet.

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Exploited in the last 30 days

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.

CVSS: 5.5 MEDIUM (v3.1, NVD)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Weakness (CWE): Not given
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Linux
NVD analysis: Analyzed
Record last updated: Jun 24, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Linux Linux linux:linux (from the name)	from da58f90f11f597520f226caff1d3cfc115abedc9 before 175556c049eaec14efde8c6475e763b7579b9de7; from da58f90f11f597520f226caff1d3cfc115abedc9 before 6e2cfd0904976e701d7a76b86b694e72af230ab0; from da58f90f11f597520f226caff1d3cfc115abedc9 before 1b7b6ae0e93b8d512e208b1378d74af052e4f4e7; from da58f90f11f597520f226caff1d3cfc115abedc9 before 818f7673ed7f4a29d4b9cee8184c47d6e57162b4; from da58f90f11f597520f226caff1d3cfc115abedc9 before 978ca6ff789f1f19c03288ac20cc1f4774e88490; from da58f90f11f597520f226caff1d3cfc115abedc9 before 750d0091bebf44975421268d37484ef87060d263; from da58f90f11f597520f226caff1d3cfc115abedc9 before bc6002865e8c4fcf9e94975f7cf023448d8764e2; from da58f90f11f597520f226caff1d3cfc115abedc9 before 35eaa6d8d6c2ee65e96f507add856e0eacf24591	CNA record
linux linux_kernel linux:linux_kernel	from 5.4 before 5.10.258; from 5.11 before 5.15.209; from 5.16 before 6.1.175; from 6.2 before 6.6.141; from 6.7 before 6.12.91; from 6.13 before 6.18.33; from 6.19 before 7.0.10; 7.1	NVD

References

References

https://git.kernel.org/stable/c/175556c049eaec14efde8c6475e763b7579b9de7	patch
https://git.kernel.org/stable/c/6e2cfd0904976e701d7a76b86b694e72af230ab0	patch
https://git.kernel.org/stable/c/1b7b6ae0e93b8d512e208b1378d74af052e4f4e7	patch
https://git.kernel.org/stable/c/818f7673ed7f4a29d4b9cee8184c47d6e57162b4	patch
https://git.kernel.org/stable/c/978ca6ff789f1f19c03288ac20cc1f4774e88490	patch
https://git.kernel.org/stable/c/750d0091bebf44975421268d37484ef87060d263	patch
https://git.kernel.org/stable/c/bc6002865e8c4fcf9e94975f7cf023448d8764e2	patch
https://git.kernel.org/stable/c/35eaa6d8d6c2ee65e96f507add856e0eacf24591	patch

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.