CVE-2026-23339

Description

In the Linux kernel, the following vulnerability has been resolved: nfc: nci: free skb on nci_transceive early error paths nci_transceive() takes ownership of the skb passed by the caller, but the -EPROTO, -EINVAL, and -EBUSY error paths return without freeing it. Due to issues clearing NCI_DATA_EXCHANGE fixed by subsequent changes the nci/nci_dev selftest hits the error path occasionally in NIPA, and kmemleak detects leaks: unreferenced object 0xff11000015ce6a40 (size 640): comm "nci_dev", pid 3954, jiffies 4295441246 hex dump (first 32 bytes): 6b 6b 6b 6b 00 a4 00 0c 02 e1 03 6b 6b 6b 6b 6b kkkk.......kkkkk 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk backtrace (crc 7c40cc2a): kmem_cache_alloc_node_noprof+0x492/0x630 __alloc_skb+0x11e/0x5f0 alloc_skb_with_frags+0xc6/0x8f0 sock_alloc_send_pskb+0x326/0x3f0 nfc_alloc_send_skb+0x94/0x1d0 rawsock_sendmsg+0x162/0x4c0 do_syscall_64+0x117/0xfc0

References

• https://git.kernel.org/stable/c/3245801d44a44c090acefe19a12d22d12cac45c5
• https://git.kernel.org/stable/c/33f6b8a96dda045789796c3bcb451c74ac158039
• https://git.kernel.org/stable/c/54f7f0eaafa56b5994cdb5c7967946922c2e1d22
• https://git.kernel.org/stable/c/7bd4b0c4779f978a6528c9b7937d2ca18e936e2c
• https://git.kernel.org/stable/c/9d448bbab724b94d6c561e1f314656f5b88a7cb3