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CVE PROGRAM SOURCE RECORD9.8 Critical

CVE-2026-43011

net/x25: Fix potential double free of skb

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Status
Published
Published
Updated
Assigning organization
Linux

Description

In the Linux kernel, the following vulnerability has been resolved: net/x25: Fix potential double free of skb When alloc_skb fails in x25_queue_rx_frame it calls kfree_skb(skb) at line 48 and returns 1 (error). This error propagates back through the call chain: x25_queue_rx_frame returns 1 | v x25_state3_machine receives the return value 1 and takes the else branch at line 278, setting queued=0 and returning 0 | v x25_process_rx_frame returns queued=0 | v x25_backlog_rcv at line 452 sees queued=0 and calls kfree_skb(skb) again This would free the same skb twice. Looking at x25_backlog_rcv: net/x25/x25_in.c:x25_backlog_rcv() { ... queued = x25_process_rx_frame(sk, skb); ... if (!queued) kfree_skb(skb); }

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

Linux Linux

Default version status: unaffected

  • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to < 5d0aa038a90b30c9bedde0c41c1fdcd98ecb16e9affected
  • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to < 3f5e3005984645bf5bd129c6b13149879580b1fbaffected
  • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to < f782dd382203b2a8c4552a628431b7de65a19a7baffected
  • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to < 143d4fa68ae9efb83b0c55b12cc7f0d03732a2b1affected
  • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to < 524371398d8463ea7e101fce2cbf3915645d1730affected
  • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to < fa1dbc93530b34fab0da9862426fe9c918c74dc0affected
  • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to < c87dd137c0dad07cc55f98181ff380b0c23d2878affected
  • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to < d10a26aa4d072320530e6968ef945c8c575edf61affected

Linux Linux

Default version status: affected

  • 2.6.12affected
  • 0 to < 2.6.12unaffected
  • 5.10.253 to ≤ 5.10.*unaffected
  • 5.15.203 to ≤ 5.15.*unaffected
  • 6.1.168 to ≤ 6.1.*unaffected
  • 6.6.134 to ≤ 6.6.*unaffected
  • 6.12.81 to ≤ 6.12.*unaffected
  • 6.18.22 to ≤ 6.18.*unaffected
  • 6.19.12 to ≤ 6.19.*unaffected
  • 7.0 to ≤ *unaffected

References