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CVE-2026-43011

net/x25: Fix potential double free of skb

Published
Last modified
published
Not listed in CISA KEV
Fix
Fixed in 5.10.253, 5.15.203, 6.1.168, 6.6.134, 6.12.81, and 2 more
None on Exploit-DB, Metasploit or GitHub
  • Exploitation: none
  • Automatable: yes
  • Technical impact: total

Summary

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); }

Timeline

  1. CVE published
  2. CISA SSVC assessment

    Exploitation: none · Automatable: yes · Technical impact: total

  3. Record last updated

Affected versions

  • Linux Linux

    From 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 · fixed in 5d0aa038a90b30c9bedde0c41c1fdcd98ecb16e9; From 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 · fixed in 3f5e3005984645bf5bd129c6b13149879580b1fb; From 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 · fixed in f782dd382203b2a8c4552a628431b7de65a19a7b; From 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 · fixed in 143d4fa68ae9efb83b0c55b12cc7f0d03732a2b1; From 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 · fixed in 524371398d8463ea7e101fce2cbf3915645d1730; From 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 · fixed in fa1dbc93530b34fab0da9862426fe9c918c74dc0; From 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 · fixed in c87dd137c0dad07cc55f98181ff380b0c23d2878; From 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 · fixed in d10a26aa4d072320530e6968ef945c8c575edf61

  • Linux Linux

    2.6.12

  • KernelLinux

    From 2.6.12 · fixed in 5.10.253; From 5.11.0 · fixed in 5.15.203; From 5.16.0 · fixed in 6.1.168; From 6.2.0 · fixed in 6.6.134; From 6.7.0 · fixed in 6.12.81; From 6.13.0 · fixed in 6.18.22; From 6.19.0 · fixed in 6.19.12

References 8

git.kernel.org