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CVE PROGRAM SOURCE RECORDUnscored

CVE-2024-36927

ipv4: Fix uninit-value access in __ip_make_skb()

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Status
Published
Published
Updated
Assigning organization
Linux

Description

In the Linux kernel, the following vulnerability has been resolved: ipv4: Fix uninit-value access in __ip_make_skb() KMSAN reported uninit-value access in __ip_make_skb() [1]. __ip_make_skb() tests HDRINCL to know if the skb has icmphdr. However, HDRINCL can cause a race condition. If calling setsockopt(2) with IP_HDRINCL changes HDRINCL while __ip_make_skb() is running, the function will access icmphdr in the skb even if it is not included. This causes the issue reported by KMSAN. Check FLOWI_FLAG_KNOWN_NH on fl4->flowi4_flags instead of testing HDRINCL on the socket. Also, fl4->fl4_icmp_type and fl4->fl4_icmp_code are not initialized. These are union in struct flowi4 and are implicitly initialized by flowi4_init_output(), but we should not rely on specific union layout. Initialize these explicitly in raw_sendmsg(). [1] BUG: KMSAN: uninit-value in __ip_make_skb+0x2b74/0x2d20 net/ipv4/ip_output.c:1481 __ip_make_skb+0x2b74/0x2d20 net/ipv4/ip_output.c:1481 ip_finish_skb include/net/ip.h:243 [inline] ip_push_pending_frames+0x4c/0x5c0 net/ipv4/ip_output.c:1508 raw_sendmsg+0x2381/0x2690 net/ipv4/raw.c:654 inet_sendmsg+0x27b/0x2a0 net/ipv4/af_inet.c:851 sock_sendmsg_nosec net/socket.c:730 [inline] __sock_sendmsg+0x274/0x3c0 net/socket.c:745 __sys_sendto+0x62c/0x7b0 net/socket.c:2191 __do_sys_sendto net/socket.c:2203 [inline] __se_sys_sendto net/socket.c:2199 [inline] __x64_sys_sendto+0x130/0x200 net/socket.c:2199 do_syscall_64+0xd8/0x1f0 arch/x86/entry/common.c:83 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+0x5f6/0xc50 mm/slub.c:3888 kmalloc_reserve+0x13c/0x4a0 net/core/skbuff.c:577 __alloc_skb+0x35a/0x7c0 net/core/skbuff.c:668 alloc_skb include/linux/skbuff.h:1318 [inline] __ip_append_data+0x49ab/0x68c0 net/ipv4/ip_output.c:1128 ip_append_data+0x1e7/0x260 net/ipv4/ip_output.c:1365 raw_sendmsg+0x22b1/0x2690 net/ipv4/raw.c:648 inet_sendmsg+0x27b/0x2a0 net/ipv4/af_inet.c:851 sock_sendmsg_nosec net/socket.c:730 [inline] __sock_sendmsg+0x274/0x3c0 net/socket.c:745 __sys_sendto+0x62c/0x7b0 net/socket.c:2191 __do_sys_sendto net/socket.c:2203 [inline] __se_sys_sendto net/socket.c:2199 [inline] __x64_sys_sendto+0x130/0x200 net/socket.c:2199 do_syscall_64+0xd8/0x1f0 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x6d/0x75 CPU: 1 PID: 15709 Comm: syz-executor.7 Not tainted 6.8.0-11567-gb3603fcb79b1 #25 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.3-1.fc39 04/01/2014

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

Linux Linux

Default version status: unaffected

  • 566785731c6dd41ef815196ddc36d1ae30a63763 to < 88c66f1879f322f11de34d37b2d3d87497afdcb6affected
  • a54ec573d9b81b05d368f8e6edc1b3e49f688658 to < 20d3eb00ab81462d554ac6d09691b8d9aa5a5741affected
  • fc60067260c20da8cddcf968bec47416f3e2cde2 to < 55bf541e018b76b3750cb6c6ea18c46e1ac5562eaffected
  • 99e5acae193e369b71217efe6f1dad42f3f18815 to < 5db08343ddb1b239320612036c398e4e1bb52818affected
  • 99e5acae193e369b71217efe6f1dad42f3f18815 to < f5c603ad4e6fcf42f84053e882ebe20184bb309eaffected
  • 99e5acae193e369b71217efe6f1dad42f3f18815 to < fc1092f51567277509563800a3c56732070b6aa4affected
  • dc4e3bb0710178c8d03fc43064e0a71fe7440cddaffected
  • 022ea4374c319690c804706bda9dc42946d1556daffected
  • 27c468ec1af113f6ae94fb5378f65e6038bd16e7affected
  • 32a5a13d556e4f804e5a447a08c70b172d600707affected
  • 9e3c96aed8fe32907e0a4bca05aad457629a820caffected
  • 5.10.180 to < 5.10.248affected
  • 5.15.111 to < 5.15.198affected
  • 6.1.28 to < 6.1.140affected
  • 4.14.315 to < 4.15affected
  • 4.19.283 to < 4.20affected
  • 5.4.243 to < 5.5affected
  • 6.2.15 to < 6.3affected
  • 6.3.2 to < 6.4affected

Linux Linux

Default version status: affected

  • 6.4affected
  • 0 to < 6.4unaffected
  • 5.10.248 to ≤ 5.10.*unaffected
  • 5.15.198 to ≤ 5.15.*unaffected
  • 6.1.140 to ≤ 6.1.*unaffected
  • 6.6.31 to ≤ 6.6.*unaffected
  • 6.8.10 to ≤ 6.8.*unaffected
  • 6.9 to ≤ *unaffected

References