CVE-2026-90049

/// Technical description

In the Linux kernel, the following vulnerability has been resolved:

net: skbuff: don't skb_tx_error() the source skb in skb_zerocopy()

skb_zerocopy() copies frags from @from into @to. On an

skb_orphan_frags() failure it calls skb_tx_error(@from), a destructive

operation on the source skb the copy helper does not own. That completes

@from's zerocopy uarg and clears SKBFL_ALL_ZEROCOPY, including the

SKBFL_SHARED_FRAG page-ownership marker.

Both callers already report the failure on their own drop path.

nfnetlink_queue does it at nla_put_failure, and Open vSwitch does it in

the flow-miss drop arm of ovs_dp_process_packet(), so nothing is lost by

dropping it here.

On Open vSwitch's OVS_ACTION_ATTR_USERSPACE path the skb is not freed on

this error: do_execute_actions() ignores output_userspace()'s return

value and, unless the upcall was the last action, keeps forwarding the

same skb through the flow's remaining actions. The uarg is completed

while that skb is still in flight, telling th

/// Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

/// References