CVE-2026-52985

Summary

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.

Affected Software

VendorProductVersion RangeStatus
LinuxLinuxda58f90f11f597520f226caff1d3cfc115abedc9 < 175556c049eaec14efde8c6475e763b7579b9de7affected
LinuxLinuxda58f90f11f597520f226caff1d3cfc115abedc9 < 6e2cfd0904976e701d7a76b86b694e72af230ab0affected
LinuxLinuxda58f90f11f597520f226caff1d3cfc115abedc9 < 1b7b6ae0e93b8d512e208b1378d74af052e4f4e7affected
LinuxLinuxda58f90f11f597520f226caff1d3cfc115abedc9 < 818f7673ed7f4a29d4b9cee8184c47d6e57162b4affected
LinuxLinuxda58f90f11f597520f226caff1d3cfc115abedc9 < 978ca6ff789f1f19c03288ac20cc1f4774e88490affected
LinuxLinuxda58f90f11f597520f226caff1d3cfc115abedc9 < 750d0091bebf44975421268d37484ef87060d263affected
LinuxLinuxda58f90f11f597520f226caff1d3cfc115abedc9 < bc6002865e8c4fcf9e94975f7cf023448d8764e2affected
LinuxLinuxda58f90f11f597520f226caff1d3cfc115abedc9 < 35eaa6d8d6c2ee65e96f507add856e0eacf24591affected
LinuxLinux5.4affected
LinuxLinux0 < 5.4unaffected
LinuxLinux5.10.258 <= 5.10.*unaffected
LinuxLinux5.15.209 <= 5.15.*unaffected
LinuxLinux6.1.175 <= 6.1.*unaffected
LinuxLinux6.6.141 <= 6.6.*unaffected
LinuxLinux6.12.91 <= 6.12.*unaffected
LinuxLinux6.18.33 <= 6.18.*unaffected
LinuxLinux7.0.10 <= 7.0.*unaffected
LinuxLinux7.1 <= *unaffected

Weaknesses

References