CVE-2026-68426 - xfrm: fix stale skb->prev after async crypto steals a GSO segment

CVE-2026-68426 - xfrm: fix stale skb->prev after async crypto steals a GSO segment

https://cvefeed.io/rssfeed/latest.atom / Mon, 08/10/2026 - 16:25
CVE ID :CVE-2026-68426
Published : Aug. 10, 2026, 12:04 p.m. | 1 hour, 23 minutes ago
Description :In the Linux kernel, the following vulnerability has been resolved: xfrm: fix stale skb->prev after async crypto steals a GSO segment skb_gso_segment() leaves the segment list head with ->prev pointing at the last segment, an invariant validate_xmit_skb_list() relies on when it sets its tail pointer (tail = skb->prev). When validate_xmit_xfrm() walks a GSO list and some segments are stolen by async crypto (->xmit() returns -EINPROGRESS), those segments are unlinked from the list but the head ->prev is never updated. If the last segment is the one stolen, the returned head still has ->prev pointing at it, even though it is now owned by the crypto engine and may be freed. validate_xmit_skb_list() later does tail->next = skb, writing through that stale pointer -- a use-after-free. Repoint skb->prev at the last retained segment before returning.
Severity: 0.0 | NA
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