Unchecked Return Value in Linux kernel - CVE-2026-98236

Vulnerability details

The vulnerability allows a local user to disclose kernel heap memory to the network stack.

The vulnerability exists due to an unchecked return value from skb_copy_bits() in mhi_mbim_rx() when processing modem-supplied network transfer blocks. A local user can supply a datagram pointer entry that references data outside the received socket buffer, causing a failed copy and subsequent delivery of an uninitialized buffer to netif_rx(), to disclose kernel heap memory to the network stack.

Affected software

How to mitigate CVE-2026-98236

External References

• https://git.kernel.org/stable/c/02eba5f36d20283f144f75d47f0354a85e4f78f0
• https://git.kernel.org/stable/c/298659c3677bf622afa9d77549cb4a967f9541e9
• https://git.kernel.org/stable/c/31550d585589fde1ae95bf7f7a8188b2d2fdf1c7
• https://git.kernel.org/stable/c/350fd3125ee26b5243935fd9e2b4d162ffba430a
• https://git.kernel.org/stable/c/650af68435eaee783824457d2ef78cc5c03c1e88
• https://git.kernel.org/stable/c/7e98216e9da08b79e07a514d2a4f7646f8c9ccb9
• https://git.kernel.org/stable/c/dd136f1fdd1059f3bc25ede3a8def8f0ee151ce7

Related Security Bulletins

• Unchecked Return Value in Linux kernel net wwan driver
• Debian update for linux