{"id":"DEBIAN-CVE-2024-35888","details":"In the Linux kernel, the following vulnerability has been resolved:  erspan: make sure erspan_base_hdr is present in skb-\u003ehead  syzbot reported a problem in ip6erspan_rcv() [1]  Issue is that ip6erspan_rcv() (and erspan_rcv()) no longer make sure erspan_base_hdr is present in skb linear part (skb-\u003ehead) before getting @ver field from it.  Add the missing pskb_may_pull() calls.  v2: Reload iph pointer in erspan_rcv() after pskb_may_pull()     because skb-\u003ehead might have changed.  [1]   BUG: KMSAN: uninit-value in pskb_may_pull_reason include/linux/skbuff.h:2742 [inline]  BUG: KMSAN: uninit-value in pskb_may_pull include/linux/skbuff.h:2756 [inline]  BUG: KMSAN: uninit-value in ip6erspan_rcv net/ipv6/ip6_gre.c:541 [inline]  BUG: KMSAN: uninit-value in gre_rcv+0x11f8/0x1930 net/ipv6/ip6_gre.c:610   pskb_may_pull_reason include/linux/skbuff.h:2742 [inline]   pskb_may_pull include/linux/skbuff.h:2756 [inline]   ip6erspan_rcv net/ipv6/ip6_gre.c:541 [inline]   gre_rcv+0x11f8/0x1930 net/ipv6/ip6_gre.c:610   ip6_protocol_deliver_rcu+0x1d4c/0x2ca0 net/ipv6/ip6_input.c:438   ip6_input_finish net/ipv6/ip6_input.c:483 [inline]   NF_HOOK include/linux/netfilter.h:314 [inline]   ip6_input+0x15d/0x430 net/ipv6/ip6_input.c:492   ip6_mc_input+0xa7e/0xc80 net/ipv6/ip6_input.c:586   dst_input include/net/dst.h:460 [inline]   ip6_rcv_finish+0x955/0x970 net/ipv6/ip6_input.c:79   NF_HOOK include/linux/netfilter.h:314 [inline]   ipv6_rcv+0xde/0x390 net/ipv6/ip6_input.c:310   __netif_receive_skb_one_core net/core/dev.c:5538 [inline]   __netif_receive_skb+0x1da/0xa00 net/core/dev.c:5652   netif_receive_skb_internal net/core/dev.c:5738 [inline]   netif_receive_skb+0x58/0x660 net/core/dev.c:5798   tun_rx_batched+0x3ee/0x980 drivers/net/tun.c:1549   tun_get_user+0x5566/0x69e0 drivers/net/tun.c:2002   tun_chr_write_iter+0x3af/0x5d0 drivers/net/tun.c:2048   call_write_iter include/linux/fs.h:2108 [inline]   new_sync_write fs/read_write.c:497 [inline]   vfs_write+0xb63/0x1520 fs/read_write.c:590   ksys_write+0x20f/0x4c0 fs/read_write.c:643   __do_sys_write fs/read_write.c:655 [inline]   __se_sys_write fs/read_write.c:652 [inline]   __x64_sys_write+0x93/0xe0 fs/read_write.c:652  do_syscall_64+0xd5/0x1f0  entry_SYSCALL_64_after_hwframe+0x6d/0x75  Uninit was created at:   slab_post_alloc_hook mm/slub.c:3804 [inline]   slab_alloc_node mm/slub.c:3845 [inline]   kmem_cache_alloc_node+0x613/0xc50 mm/slub.c:3888   kmalloc_reserve+0x13d/0x4a0 net/core/skbuff.c:577   __alloc_skb+0x35b/0x7a0 net/core/skbuff.c:668   alloc_skb include/linux/skbuff.h:1318 [inline]   alloc_skb_with_frags+0xc8/0xbf0 net/core/skbuff.c:6504   sock_alloc_send_pskb+0xa81/0xbf0 net/core/sock.c:2795   tun_alloc_skb drivers/net/tun.c:1525 [inline]   tun_get_user+0x209a/0x69e0 drivers/net/tun.c:1846   tun_chr_write_iter+0x3af/0x5d0 drivers/net/tun.c:2048   call_write_iter include/linux/fs.h:2108 [inline]   new_sync_write fs/read_write.c:497 [inline]   vfs_write+0xb63/0x1520 fs/read_write.c:590   ksys_write+0x20f/0x4c0 fs/read_write.c:643   __do_sys_write fs/read_write.c:655 [inline]   __se_sys_write fs/read_write.c:652 [inline]   __x64_sys_write+0x93/0xe0 fs/read_write.c:652  do_syscall_64+0xd5/0x1f0  entry_SYSCALL_64_after_hwframe+0x6d/0x75  CPU: 1 PID: 5045 Comm: syz-executor114 Not tainted 6.9.0-rc1-syzkaller-00021-g962490525cff #0","modified":"2026-09-15T09:02:56.804661203Z","published":"2024-05-19T09:15:09.910Z","upstream":["CVE-2024-35888"],"references":[{"type":"ADVISORY","url":"https://security-tracker.debian.org/tracker/CVE-2024-35888"}],"affected":[{"package":{"name":"linux","ecosystem":"Debian:12","purl":"pkg:deb/debian/linux?arch=source&distro=bookworm"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.1.85-1"}]}],"versions":["6.1.27-1","6.1.37-1","6.1.38-1","6.1.38-2","6.1.38-2~bpo11+1","6.1.38-3","6.1.38-4","6.1.38-4~bpo11+1","6.1.52-1","6.1.55-1","6.1.55-1~bpo11+1","6.1.64-1","6.1.66-1","6.1.67-1","6.1.69-1","6.1.69-1~bpo11+1","6.1.76-1","6.1.76-1~bpo11+1","6.1.82-1"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2024-35888.json"}},{"package":{"name":"linux","ecosystem":"Debian:13","purl":"pkg:deb/debian/linux?arch=source&distro=trixie"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.8.9-1"}]}],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2024-35888.json"}},{"package":{"name":"linux","ecosystem":"Debian:14","purl":"pkg:deb/debian/linux?arch=source&distro=forky"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.8.9-1"}]}],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2024-35888.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L"}]}