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CVE-2026-80794

nfc: nci: fix uninit-value in the RF discover/activated NTF handlers

Published
Last modified
published
Not listed in CISA KEV
Fix
Fixed in 5.10.269, 5.15.218, 6.1.185, 6.6.154, 6.12.106, and 3 more
None on Exploit-DB, Metasploit or GitHub

Summary

In the Linux kernel, the following vulnerability has been resolved: nfc: nci: fix uninit-value in the RF discover/activated NTF handlers nci_rf_discover_ntf_packet() and nci_rf_intf_activated_ntf_packet() each parse a notification into an on-stack struct (nci_rf_discover_ntf / nci_rf_intf_activated_ntf) that is not initialised. The RF technology-specific parameters are only extracted when rf_tech_specific_params_len is non-zero, so a notification that reports a zero length leaves the rf_tech_specific_params union uninitialised - and both handlers then pass it to nci_add_new_protocol(), which reads it: • discover: nci_add_new_target() -> nci_add_new_protocol(); • activated: nci_target_auto_activated() -> nci_add_new_protocol(). nci_add_new_protocol() uses nfca_poll->nfcid1_len as both a branch condition and a memcpy() length and copies nfcid1/sens_res/sel_res into ndev->targets, which is later exposed to user space via NFC_CMD_GET_TARGET. BUG: KMSAN: uninit-value in nci_add_new_protocol+0x624/0x6c0 nci_add_new_protocol+0x624/0x6c0 nci_ntf_packet+0x25b2/0x3c30 nci_rx_work+0x318/0x5d0 process_scheduled_works+0x84b/0x17a0 worker_thread+0xc10/0x11b0 kthread+0x376/0x500 Local variable ntf.i created at: nci_ntf_packet+0xbc2/0x3c30 Zero-initialise both on-stack notifications so the union reads back as zero when no technology-specific parameters are present.

Timeline

  1. CVE published
  2. Record last updated

Affected versions

  • Linux Linux

    From e8c0dacd9836dc2dcb28d236c9cc3cfaa9965a20 · fixed in 1007a6b429d756513abd25bd00290908f2e89a4a; From e8c0dacd9836dc2dcb28d236c9cc3cfaa9965a20 · fixed in 4bda9ef8392710f21e99027467f3f4afdfb5c99a; From e8c0dacd9836dc2dcb28d236c9cc3cfaa9965a20 · fixed in fe69fed3495f676578d49414a069ad7d8468e2ce; From e8c0dacd9836dc2dcb28d236c9cc3cfaa9965a20 · fixed in 7489f59d1ea2d3298aa41de7baf193e5e6e132f6; From e8c0dacd9836dc2dcb28d236c9cc3cfaa9965a20 · fixed in 7086dab72b3ed95df96842801e10e935cfeb27a3; From e8c0dacd9836dc2dcb28d236c9cc3cfaa9965a20 · fixed in 0d4b5cfab6891a5ca0f6aef209beebba4bd7c095; From e8c0dacd9836dc2dcb28d236c9cc3cfaa9965a20 · fixed in 5bd00c0e1470d90d77a7c60242854257ddf14e00; From e8c0dacd9836dc2dcb28d236c9cc3cfaa9965a20 · fixed in d6f743d3d388913135681cde051c08823730194f; From e8c0dacd9836dc2dcb28d236c9cc3cfaa9965a20 · fixed in 8cbe06c1e699c0a165dae5093a2550e65f914818

  • Linux Linux

    3.3

  • KernelLinux

    From 3.3.0 · fixed in 5.10.269; From 5.11.0 · fixed in 5.15.218; From 5.16.0 · fixed in 6.1.185; From 6.2.0 · fixed in 6.6.154; From 6.7.0 · fixed in 6.12.106; From 6.13.0 · fixed in 6.18.47; From 6.19.0 · fixed in 7.1.11; From 7.2.0 · fixed in 7.2.1

References 9

git.kernel.org