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CVE-2026-63831

mac802154: llsec: add skb_cow_data() before in-place crypto

Published
Last modified
published
Not listed in CISA KEV
Fix
Fixed in 5.10.260, 5.15.211, 6.1.177, 6.6.144, 6.12.95, and 2 more
None on Exploit-DB, Metasploit or GitHub
  • Exploitation: none
  • Automatable: no
  • Technical impact: total

Summary

In the Linux kernel, the following vulnerability has been resolved: mac802154: llsec: add skb_cow_data() before in-place crypto llsec_do_encrypt_unauth(), llsec_do_encrypt_auth(), llsec_do_decrypt_unauth(), and llsec_do_decrypt_auth() all perform in-place cryptographic transformations on skb data. They build a scatterlist with sg_init_one() pointing into the skb's linear data area and then pass the same scatterlist as both src and dst to the crypto API (e.g. crypto_skcipher_encrypt/decrypt, crypto_aead_encrypt/decrypt). On the RX path, __ieee802154_rx_handle_packet() clones the received skb before handing it to each subscriber via ieee802154_subif_frame(). The cloned skb shares the same underlying data buffer via reference counting. When llsec_do_decrypt() subsequently modifies this shared buffer in place, it corrupts data that other clones -- potentially belonging to other sockets or subsystems -- still reference. On the TX path, similar data sharing can occur when an skb's head has been cloned (skb_cloned() returns true). The fix is to call skb_cow_data() before performing any in-place crypto operation. skb_cow_data() ensures that the skb's data area is not shared: if the skb head is cloned or the data spans multiple fragments, it copies the data into a private buffer that can be safely modified in place. This is the same pattern used by: • ESP (net/ipv4/esp4.c, net/ipv6/esp6.c) • MACsec (drivers/net/macsec.c) • WireGuard (drivers/net/wireguard/receive.c) • TIPC (net/tipc/crypto.c) Without this guard, in-place crypto on shared skb data leads to: • Silent data corruption of other skb clones • Use-after-free when the crypto API scatterwalk writes through a page that has already been freed by another clone's kfree_skb() • Kernel crashes under concurrent 802.15.4 traffic with security enabled (KASAN/KMSAN reports slab-use-after-free) Found by 0sec (https://0sec.ai) using automated source analysis.

Timeline

  1. CVE published
  2. CISA SSVC assessment

    Exploitation: none · Automatable: no · Technical impact: total

  3. Record last updated

Affected versions

  • Linux Linux

    From 03556e4d0dbbbf4af9df76f4a3839c86f6afb015 · fixed in 3a2b378b3a9ca75d3518d879148d2ad25b5714a9; From 03556e4d0dbbbf4af9df76f4a3839c86f6afb015 · fixed in 7a831bcd0486788283ef35e396d4282ee01bb0d5; From 03556e4d0dbbbf4af9df76f4a3839c86f6afb015 · fixed in ff976ef7c39199ebff33c18034636595016db9f0; From 03556e4d0dbbbf4af9df76f4a3839c86f6afb015 · fixed in e28e7fd34c449028325322a3f5127b92594b7396; From 03556e4d0dbbbf4af9df76f4a3839c86f6afb015 · fixed in 993fd674fe85d114e6a8d3963033d4fbbc2170a8; From 03556e4d0dbbbf4af9df76f4a3839c86f6afb015 · fixed in bd968bdd568beacfdf98ec537a87527e85f1d0cf; From 03556e4d0dbbbf4af9df76f4a3839c86f6afb015 · fixed in 86d531337ea1ba02d9f2bc830d07c683d9bfaade; From 03556e4d0dbbbf4af9df76f4a3839c86f6afb015 · fixed in 84a04eb5b210643bd67aab81ff805d32f62aa865

  • Linux Linux

    3.16

  • KernelLinux

    From 3.16.0 · fixed in 5.10.260; From 5.11.0 · fixed in 5.15.211; From 5.16.0 · fixed in 6.1.177; From 6.2.0 · fixed in 6.6.144; From 6.7.0 · fixed in 6.12.95; From 6.13.0 · fixed in 6.18.38; From 6.19.0 · fixed in 7.1.3

References 8

git.kernel.org