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.

A flaw was found in the Linux kernel's netdevsim module. An uninitialized memory vulnerability exists in the handling of struct iphdr within a dummy sk_buff due to the use of skb_put instead of skb_put_zero. This could lead to unpredictable system behavior, including crashes (Denial of Service), or potentially the disclosure of sensitive information.

Red Hat Enterprise Linux 10 Fix deferred kernel Red Hat Enterprise Linux 6 Not affected kernel Red Hat Enterprise Linux 7 Not affected kernel Red Hat Enterprise Linux 7 Not affected kernel-rt Red Hat Enterprise Linux 8 Fix deferred kernel Red Hat Enterprise Linux 8 Fix deferred kernel-rt Red Hat Enterprise Linux 9 Fix deferred kernel Red Hat Enterprise Linux 9 Fix deferred kernel-rt https://www.cve.org/CVERecord?id=CVE-2026-52985 https://nvd.nist.gov/vuln/detail/CVE-2026-52985 https://lore.kernel.org/linux-cve-announce/2026062443-CVE-2026-52985-60a1@gregkh/T