Linux/Unix 主機上安裝了一個或多個受到弱點影響的套件，且供應商未提供可用的修補程式。

  - netlink修正 __skb_datagram_iter 中的 kernel-infoleak-after-free syzbot 報告下列 uninit-value 存取問題 [1]netlink_to_full_skb() 會建立新的「skb」並將「skb->data」作為 的第一個引數傳送netlink_to_full_skb() 複製到新的 `skb`。將資料大小指定為「len」並傳遞至 skb_put_data()。
    此「len」以「skb->end」為基礎，後者不是資料位移，而是緩衝區位移。「skb->end」包含資料和 tailroom。由於建立新的「skb」時 tailroom 並未初始化，KMSAN 會在復制資料時偵測未初始化的記憶體區域。此修補程式已解決此問題，方法是將 len 從「skb->end」更正為「skb->len」，即實際資料位移。錯誤：KMSAN：instrument_copy_to_user include/linux/instrumented.h:114 中的 kernel-infoleak-after-free [內嵌] 錯誤：KMSAN：copy_to_user_iter lib/iov_iter.c:24 中的 kernel-infoleak-after-free [內嵌] 錯誤：KMSAN：iterate_ubuf include/linux/iov_iter.h:29 中的 kernel-infoleak-after-free [內嵌] 錯誤：KMSAN：iterate_and_advance2 include/linux/iov_iter.h:245 中的 kernel-infoleak-after-free [內嵌] 錯誤：KMSAN：iterate_and_advance include/linux/iov_iter.h:271 中的 kernel-infoleak-after-free [內嵌] 錯誤：KMSAN：_copy_to_iter+0x364/0x2520 lib/iov_iter.c:186 instrument_copy_to_user include/linux/instrumented.h:114 中的 kernel-infoleak-after-free [內嵌] copy_to_user_iter lib/iov_iter.c:24 [內嵌] iterate_ubuf include/linux/iov_iter.h:29 [內嵌] iterate_and_advance2 include/linux/iov_iter.h:245 [內嵌] iterate_and_advance include/ linux/iov_iter.h:271 [內嵌]
    _copy_to_iter+0x364/0x2520 lib/iov_iter.c:186 copy_to_iter include/linux/uio.h:197 [內嵌] simple_copy_to_iter+0x68/0xa0 net/core/datagram.c:532 __skb_datagram_iter+0x123/0xdc0 net/core/datagram.c:420 skb_copy_datagram_iter+0x5c/0x200 net/core/datagram.c:546 skb_copy_datagram_msg include/linux/skbuff.h:3960 [內嵌] packet_recvmsg+0xd9c/0x2000 net/packet/af_packet.c:3482 sock_recvmsg_nosec net/socket.c:1044 [內嵌] sock_recvmsg net/socket.c:1066 [內嵌] sock_read_iter+0x467/0x580 net/socket.c:1136 call_read_iter include/linux/fs.h:2014 [內嵌] new_sync_read fs/read_write.c:389 [內嵌] vfs_read+0x8f6/0xe00 fs/read_write.c:470 ksys_read+0x20f/0x4c0 fs/read_write.c:613 __do_sys_read fs/read_write.c:623 [內嵌] __se_sys_read fs/read_write.c:621 [內嵌]
    __x64_sys_read+0x93/0xd0 fs/read_write.c:621 do_syscall_x64 arch/x86/entry/common.c:52 [內嵌] do_syscall_64+0x44/0x110 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x63/0x6b Uninit 是儲存至位於下列位置的記憶體：skb_put_data include/linux/skbuff.h:2622 [內嵌] netlink_to_full_skb net/netlink/af_netlink.c:181 [內嵌] __netlink_deliver_tap_skb net/netlink/af_netlink.c:298 [內嵌]
    __netlink_deliver_tap+0x5be/0xc90 net/netlink/af_netlink.c:325 netlink_deliver_tap net/netlink/af_netlink.c:338 [內嵌] netlink_deliver_tap_kernel net/netlink/af_netlink.c:347 [內嵌] netlink_unicast_kernel net/netlink/af_netlink.c:1341 [inline] netlink_unicast+0x10f1/0x1250 net/netlink/af_netlink.c:1368 netlink_sendmsg+0x1238/0x13d0 net/netlink/af_netlink.c:1910 sock_sendmsg_nosec net/socket.c:730 [內嵌] __sock_sendmsg net/socket.c:745 [內嵌]
    ____sys_sendmsg+0x9c2/0xd60 net/socket.c:2584 ___sys_sendmsg+0x28d/0x3c0 net/socket.c:2638 __sys_sendmsg net/socket.c:2667 [內嵌] __do_sys_sendmsg net/socket.c:2676 [內嵌] __se_sys_sendmsg net/socket.c:2674 [內嵌] __x64_sys_sendmsg+0x307/0x490 net/socket.c:2674 do_syscall_x64 arch/x86/entry/common.c:52 [內嵌] do_syscall_64+0x44/0x110 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x63/0x6b Uninit 的建立位置為：free_pages_prepare mm/page_alloc.c:1087 [內嵌] free_unref_page_prepare+0xb0/0xa40 mm/page_alloc.c:2347 free_unref_page_list+0xeb/0x1100 mm/page_alloc.c:2533 release_pages+0x23d3/0x2410 mm/swap.c:1042 free_pages_and_swap_cache+0xd9/0xf0 mm/swap_state.c:316 tlb_batch_pages ---truncated--- (CVE-2024-26805)

請注意，Nessus 依賴供應商報告的套件存在。

偵測

Linux Distros 未修補的弱點：CVE-2024-26805

medium Nessus Plugin ID 249533

版本 1.6