CVE-2024-36927

Advisory lineage Upstream: 0 Downstream: 34
Modified
Published: 30 May 2024, 15:29
Last modified:14 Jul 2026, 12:37

Vulnerability Summary

Overall Risk (default)
low
19/100
CVSS Score
4.7 MEDIUM
v3.1 (nvd)
EPSS Score
0.17% LOW
0% probability +0.16%
KEV
Not listed
Ransomware
No reports
Public exploits
None found
Dark Web
Not detected

Timeline

30 May 2024, 15:29
Published
Vulnerability first disclosed
14 Jul 2026, 12:37
Last Modified
Vulnerability information updated

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

CVSS Metrics

  • v3.1•MEDIUM•Score: 4.7CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H

EPSS Trends

Current EPSS score: 0.17%• Percentile: 6%

Techniques & Countermeasures

  • CWE-362•Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')

    The product contains a concurrent code sequence that requires temporary, exclusive access to a shared resource, but a timing window exists in which the shared resource can be modified by another code sequence operating concurrently.

  • CWE-908•Use of Uninitialized Resource

    The product uses or accesses a resource that has not been initialized.

Affected Systems

  • linux•linux

    ≥ 566785731c6dd41ef815196ddc36d1ae30a63763, < 88c66f1879f322f11de34d37b2d3d87497afdcb6 | ≥ a54ec573d9b81b05d368f8e6edc1b3e49f688658, < 20d3eb00ab81462d554ac6d09691b8d9aa5a5741 | ≥ fc60067260c20da8cddcf968bec47416f3e2cde2, < 55bf541e018b76b3750cb6c6ea18c46e1ac5562e | ≥ 99e5acae193e369b71217efe6f1dad42f3f18815, < 5db08343ddb1b239320612036c398e4e1bb52818 | ≥ 99e5acae193e369b71217efe6f1dad42f3f18815, < f5c603ad4e6fcf42f84053e882ebe20184bb309e | ≥ 99e5acae193e369b71217efe6f1dad42f3f18815, < fc1092f51567277509563800a3c56732070b6aa4 | dc4e3bb0710178c8d03fc43064e0a71fe7440cdd | 022ea4374c319690c804706bda9dc42946d1556d | 27c468ec1af113f6ae94fb5378f65e6038bd16e7 | 32a5a13d556e4f804e5a447a08c70b172d600707 | 9e3c96aed8fe32907e0a4bca05aad457629a820c | ≥ 5.10.180, < 5.10.248 | ≥ 5.15.111, < 5.15.198 | ≥ 6.1.28, < 6.1.140 | ≥ 4.14.315, < 4.15 | ≥ 4.19.283, < 4.20 | ≥ 5.4.243, < 5.5 | ≥ 6.2.15, < 6.3 | ≥ 6.3.2, < 6.4 | 6.4

  • linux•linux kernel

    ≥ 4.14.315, < 4.15 | ≥ 4.19.283, < 4.20 | ≥ 5.4.243, < 5.5 | ≥ 5.10.180, < 5.11 | ≥ 5.15.111, < 5.16 | ≥ 6.1.28, < 6.2 | ≥ 6.2.15, < 6.3 | ≥ 6.3.2, < 6.6.31 | ≥ 6.7, < 6.8.10 | 6.9:rc1 | 6.9:rc2 | 6.9:rc3 | 6.9:rc4 | 6.9:rc5 | 6.9:rc6

References (8)