CVE-2024-35888

CVE Details

Release Date:

2024-05-19

Description

In the Linux kernel, the following vulnerability has been resolved:\nerspan: make sure erspan_base_hdr is present in skb->head\nsyzbot reported a problem in ip6erspan_rcv() [1]\nIssue is that ip6erspan_rcv() (and erspan_rcv()) no longer make\nsure erspan_base_hdr is present in skb linear part (skb->head)\nbefore getting @ver field from it.\nAdd the missing pskb_may_pull() calls.\nv2: Reload iph pointer in erspan_rcv() after pskb_may_pull()\nbecause skb->head might have changed.\n[1]\nBUG: KMSAN: uninit-value in pskb_may_pull_reason include/linux/skbuff.h:2742 [inline]\nBUG: KMSAN: uninit-value in pskb_may_pull include/linux/skbuff.h:2756 [inline]\nBUG: KMSAN: uninit-value in ip6erspan_rcv net/ipv6/ip6_gre.c:541 [inline]\nBUG: KMSAN: uninit-value in gre_rcv+0x11f8/0x1930 net/ipv6/ip6_gre.c:610\npskb_may_pull_reason include/linux/skbuff.h:2742 [inline]\npskb_may_pull include/linux/skbuff.h:2756 [inline]\nip6erspan_rcv net/ipv6/ip6_gre.c:541 [inline]\ngre_rcv+0x11f8/0x1930 net/ipv6/ip6_gre.c:610\nip6_protocol_deliver_rcu+0x1d4c/0x2ca0 net/ipv6/ip6_input.c:438\nip6_input_finish net/ipv6/ip6_input.c:483 [inline]\nNF_HOOK include/linux/netfilter.h:314 [inline]\nip6_input+0x15d/0x430 net/ipv6/ip6_input.c:492\nip6_mc_input+0xa7e/0xc80 net/ipv6/ip6_input.c:586\ndst_input include/net/dst.h:460 [inline]\nip6_rcv_finish+0x955/0x970 net/ipv6/ip6_input.c:79\nNF_HOOK include/linux/netfilter.h:314 [inline]\nipv6_rcv+0xde/0x390 net/ipv6/ip6_input.c:310\n__netif_receive_skb_one_core net/core/dev.c:5538 [inline]\n__netif_receive_skb+0x1da/0xa00 net/core/dev.c:5652\nnetif_receive_skb_internal net/core/dev.c:5738 [inline]\nnetif_receive_skb+0x58/0x660 net/core/dev.c:5798\ntun_rx_batched+0x3ee/0x980 drivers/net/tun.c:1549\ntun_get_user+0x5566/0x69e0 drivers/net/tun.c:2002\ntun_chr_write_iter+0x3af/0x5d0 drivers/net/tun.c:2048\ncall_write_iter include/linux/fs.h:2108 [inline]\nnew_sync_write fs/read_write.c:497 [inline]\nvfs_write+0xb63/0x1520 fs/read_write.c:590\nksys_write+0x20f/0x4c0 fs/read_write.c:643\n__do_sys_write fs/read_write.c:655 [inline]\n__se_sys_write fs/read_write.c:652 [inline]\n__x64_sys_write+0x93/0xe0 fs/read_write.c:652\ndo_syscall_64+0xd5/0x1f0\nentry_SYSCALL_64_after_hwframe+0x6d/0x75\nUninit was created at:\nslab_post_alloc_hook mm/slub.c:3804 [inline]\nslab_alloc_node mm/slub.c:3845 [inline]\nkmem_cache_alloc_node+0x613/0xc50 mm/slub.c:3888\nkmalloc_reserve+0x13d/0x4a0 net/core/skbuff.c:577\n__alloc_skb+0x35b/0x7a0 net/core/skbuff.c:668\nalloc_skb include/linux/skbuff.h:1318 [inline]\nalloc_skb_with_frags+0xc8/0xbf0 net/core/skbuff.c:6504\nsock_alloc_send_pskb+0xa81/0xbf0 net/core/sock.c:2795\ntun_alloc_skb drivers/net/tun.c:1525 [inline]\ntun_get_user+0x209a/0x69e0 drivers/net/tun.c:1846\ntun_chr_write_iter+0x3af/0x5d0 drivers/net/tun.c:2048\ncall_write_iter include/linux/fs.h:2108 [inline]\nnew_sync_write fs/read_write.c:497 [inline]\nvfs_write+0xb63/0x1520 fs/read_write.c:590\nksys_write+0x20f/0x4c0 fs/read_write.c:643\n__do_sys_write fs/read_write.c:655 [inline]\n__se_sys_write fs/read_write.c:652 [inline]\n__x64_sys_write+0x93/0xe0 fs/read_write.c:652\ndo_syscall_64+0xd5/0x1f0\nentry_SYSCALL_64_after_hwframe+0x6d/0x75\nCPU: 1 PID: 5045 Comm: syz-executor114 Not tainted 6.9.0-rc1-syzkaller-00021-g962490525cff #0

See more information about CVE-2024-35888 from MITRE CVE dictionary and NIST NVD

CVSS Scoring

NOTE: The following CVSS v3.1 metrics and score provided are preliminary and subject to review.

Base Score:	5.5	CVSS Vector:	CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Attack Vector:	Local network	Attack Complexity:	Low
Privileges Required:	Low	User Interaction:	None
Scope:	Unchanged	Confidentiality Impact:	None
Integrity Impact:	None	Availability Impact:	High

Errata information

Platform	Errata	Release Date
Oracle Linux version 8 (kernel)	ELSA-2024-4211	2024-07-02
Oracle Linux version 9 (kernel)	ELSA-2024-9315	2024-11-14