{"cve":"CVE-2024-35888","nvd":{"published":"2024-05-19T09:15:09.910","modified":"2026-10-15T01:17:50.060","status":"Modified","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nerspan: make sure erspan_base_hdr is present in skb->head\n\nsyzbot reported a problem in ip6erspan_rcv() [1]\n\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.\n\nAdd the missing pskb_may_pull() calls.\n\nv2: Reload iph pointer in erspan_rcv() after pskb_may_pull()\n    because skb->head might have changed.\n\n[1]\n\n BUG: KMSAN: uninit-value in pskb_may_pull_reason include/linux/skbuff.h:2742 [inline]\n BUG: KMSAN: uninit-value in pskb_may_pull include/linux/skbuff.h:2756 [inline]\n BUG: KMSAN: uninit-value in ip6erspan_rcv net/ipv6/ip6_gre.c:541 [inline]\n BUG: KMSAN: uninit-value in gre_rcv+0x11f8/0x1930 net/ipv6/ip6_gre.c:610\n  pskb_may_pull_reason include/linux/skbuff.h:2742 [inline]\n  pskb_may_pull include/linux/skbuff.h:2756 [inline]\n  ip6erspan_rcv net/ipv6/ip6_gre.c:541 [inline]\n  gre_rcv+0x11f8/0x1930 net/ipv6/ip6_gre.c:610\n  ip6_protocol_deliver_rcu+0x1d4c/0x2ca0 net/ipv6/ip6_input.c:438\n  ip6_input_finish net/ipv6/ip6_input.c:483 [inline]\n  NF_HOOK include/linux/netfilter.h:314 [inline]\n  ip6_input+0x15d/0x430 net/ipv6/ip6_input.c:492\n  ip6_mc_input+0xa7e/0xc80 net/ipv6/ip6_input.c:586\n  dst_input include/net/dst.h:460 [inline]\n  ip6_rcv_finish+0x955/0x970 net/ipv6/ip6_input.c:79\n  NF_HOOK include/linux/netfilter.h:314 [inline]\n  ipv6_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\n  netif_receive_skb_internal net/core/dev.c:5738 [inline]\n  netif_receive_skb+0x58/0x660 net/core/dev.c:5798\n  tun_rx_batched+0x3ee/0x980 drivers/net/tun.c:1549\n  tun_get_user+0x5566/0x69e0 drivers/net/tun.c:2002\n  tun_chr_write_iter+0x3af/0x5d0 drivers/net/tun.c:2048\n  call_write_iter include/linux/fs.h:2108 [inline]\n  new_sync_write fs/read_write.c:497 [inline]\n  vfs_write+0xb63/0x1520 fs/read_write.c:590\n  ksys_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\n do_syscall_64+0xd5/0x1f0\n entry_SYSCALL_64_after_hwframe+0x6d/0x75\n\nUninit was created at:\n  slab_post_alloc_hook mm/slub.c:3804 [inline]\n  slab_alloc_node mm/slub.c:3845 [inline]\n  kmem_cache_alloc_node+0x613/0xc50 mm/slub.c:3888\n  kmalloc_reserve+0x13d/0x4a0 net/core/skbuff.c:577\n  __alloc_skb+0x35b/0x7a0 net/core/skbuff.c:668\n  alloc_skb include/linux/skbuff.h:1318 [inline]\n  alloc_skb_with_frags+0xc8/0xbf0 net/core/skbuff.c:6504\n  sock_alloc_send_pskb+0xa81/0xbf0 net/core/sock.c:2795\n  tun_alloc_skb drivers/net/tun.c:1525 [inline]\n  tun_get_user+0x209a/0x69e0 drivers/net/tun.c:1846\n  tun_chr_write_iter+0x3af/0x5d0 drivers/net/tun.c:2048\n  call_write_iter include/linux/fs.h:2108 [inline]\n  new_sync_write fs/read_write.c:497 [inline]\n  vfs_write+0xb63/0x1520 fs/read_write.c:590\n  ksys_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\n do_syscall_64+0xd5/0x1f0\n entry_SYSCALL_64_after_hwframe+0x6d/0x75\n\nCPU: 1 PID: 5045 Comm: syz-executor114 Not tainted 6.9.0-rc1-syzkaller-00021-g962490525cff #0","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L","score":7.3},"cwes":["CWE-908"],"references":["https://git.kernel.org/stable/c/06a939f72a24a7d8251f84cf4c042df86c6666ac","https://git.kernel.org/stable/c/0ac328a5a4138a6c03dfc3f46017bd5c19167446","https://git.kernel.org/stable/c/17af420545a750f763025149fa7b833a4fc8b8f0","https://git.kernel.org/stable/c/1db7fcb2b290c47c202b79528824f119fa28937d","https://git.kernel.org/stable/c/4e3fdeecec5707678b0d1f18c259dadb97262e9d"],"products":["debian:debian_linux","linux:linux_kernel"],"source":"nvd","synced_at":"2026-10-19T21:50:30.954589733+00:00"},"epss":{"cve":"CVE-2024-35888","score":0.00606,"percentile":0.48677,"date":"2026-10-25"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}