CVE-2024-36927 (GCVE-0-2024-36927)

Vulnerability from cvelistv5 – Published: 2024-05-30 15:29 – Updated: 2026-01-19 12:17
VLAI?
Title
ipv4: Fix uninit-value access in __ip_make_skb()
Summary
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
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 566785731c6dd41ef815196ddc36d1ae30a63763 , < 88c66f1879f322f11de34d37b2d3d87497afdcb6 (git)
Affected: a54ec573d9b81b05d368f8e6edc1b3e49f688658 , < 20d3eb00ab81462d554ac6d09691b8d9aa5a5741 (git)
Affected: fc60067260c20da8cddcf968bec47416f3e2cde2 , < 55bf541e018b76b3750cb6c6ea18c46e1ac5562e (git)
Affected: 99e5acae193e369b71217efe6f1dad42f3f18815 , < 5db08343ddb1b239320612036c398e4e1bb52818 (git)
Affected: 99e5acae193e369b71217efe6f1dad42f3f18815 , < f5c603ad4e6fcf42f84053e882ebe20184bb309e (git)
Affected: 99e5acae193e369b71217efe6f1dad42f3f18815 , < fc1092f51567277509563800a3c56732070b6aa4 (git)
Affected: dc4e3bb0710178c8d03fc43064e0a71fe7440cdd (git)
Affected: 022ea4374c319690c804706bda9dc42946d1556d (git)
Affected: 27c468ec1af113f6ae94fb5378f65e6038bd16e7 (git)
Affected: 32a5a13d556e4f804e5a447a08c70b172d600707 (git)
Affected: 9e3c96aed8fe32907e0a4bca05aad457629a820c (git)
Create a notification for this product.
    Linux Linux Affected: 6.4
Unaffected: 0 , < 6.4 (semver)
Unaffected: 5.10.248 , ≤ 5.10.* (semver)
Unaffected: 5.15.198 , ≤ 5.15.* (semver)
Unaffected: 6.1.140 , ≤ 6.1.* (semver)
Unaffected: 6.6.31 , ≤ 6.6.* (semver)
Unaffected: 6.8.10 , ≤ 6.8.* (semver)
Unaffected: 6.9 , ≤ * (original_commit_for_fix)
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\"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2024-05-30T18:44:35.278Z\"}, \"title\": \"CISA ADP Vulnrichment\"}], \"cna\": {\"title\": \"ipv4: Fix uninit-value access in __ip_make_skb()\", \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"566785731c6dd41ef815196ddc36d1ae30a63763\", \"lessThan\": \"88c66f1879f322f11de34d37b2d3d87497afdcb6\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"a54ec573d9b81b05d368f8e6edc1b3e49f688658\", \"lessThan\": \"20d3eb00ab81462d554ac6d09691b8d9aa5a5741\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"fc60067260c20da8cddcf968bec47416f3e2cde2\", \"lessThan\": \"55bf541e018b76b3750cb6c6ea18c46e1ac5562e\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": 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\"9e3c96aed8fe32907e0a4bca05aad457629a820c\", \"versionType\": \"git\"}], \"programFiles\": [\"net/ipv4/ip_output.c\", \"net/ipv4/raw.c\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"6.4\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"6.4\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"5.10.248\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.10.*\"}, {\"status\": \"unaffected\", \"version\": \"5.15.198\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.15.*\"}, {\"status\": \"unaffected\", \"version\": \"6.1.140\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.1.*\"}, {\"status\": \"unaffected\", \"version\": \"6.6.31\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.6.*\"}, {\"status\": \"unaffected\", \"version\": \"6.8.10\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.8.*\"}, {\"status\": \"unaffected\", \"version\": \"6.9\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"net/ipv4/ip_output.c\", \"net/ipv4/raw.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/88c66f1879f322f11de34d37b2d3d87497afdcb6\"}, {\"url\": \"https://git.kernel.org/stable/c/20d3eb00ab81462d554ac6d09691b8d9aa5a5741\"}, {\"url\": \"https://git.kernel.org/stable/c/55bf541e018b76b3750cb6c6ea18c46e1ac5562e\"}, {\"url\": \"https://git.kernel.org/stable/c/5db08343ddb1b239320612036c398e4e1bb52818\"}, {\"url\": \"https://git.kernel.org/stable/c/f5c603ad4e6fcf42f84053e882ebe20184bb309e\"}, {\"url\": \"https://git.kernel.org/stable/c/fc1092f51567277509563800a3c56732070b6aa4\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\nipv4: Fix uninit-value access in __ip_make_skb()\\n\\nKMSAN reported uninit-value access in __ip_make_skb() [1].  __ip_make_skb()\\ntests HDRINCL to know if the skb has icmphdr. However, HDRINCL can cause a\\nrace condition. If calling setsockopt(2) with IP_HDRINCL changes HDRINCL\\nwhile __ip_make_skb() is running, the function will access icmphdr in the\\nskb even if it is not included. This causes the issue reported by KMSAN.\\n\\nCheck FLOWI_FLAG_KNOWN_NH on fl4-\u003eflowi4_flags instead of testing HDRINCL\\non the socket.\\n\\nAlso, fl4-\u003efl4_icmp_type and fl4-\u003efl4_icmp_code are not initialized. These\\nare union in struct flowi4 and are implicitly initialized by\\nflowi4_init_output(), but we should not rely on specific union layout.\\n\\nInitialize these explicitly in raw_sendmsg().\\n\\n[1]\\nBUG: KMSAN: uninit-value in __ip_make_skb+0x2b74/0x2d20 net/ipv4/ip_output.c:1481\\n __ip_make_skb+0x2b74/0x2d20 net/ipv4/ip_output.c:1481\\n ip_finish_skb include/net/ip.h:243 [inline]\\n ip_push_pending_frames+0x4c/0x5c0 net/ipv4/ip_output.c:1508\\n raw_sendmsg+0x2381/0x2690 net/ipv4/raw.c:654\\n inet_sendmsg+0x27b/0x2a0 net/ipv4/af_inet.c:851\\n sock_sendmsg_nosec net/socket.c:730 [inline]\\n __sock_sendmsg+0x274/0x3c0 net/socket.c:745\\n __sys_sendto+0x62c/0x7b0 net/socket.c:2191\\n __do_sys_sendto net/socket.c:2203 [inline]\\n __se_sys_sendto net/socket.c:2199 [inline]\\n __x64_sys_sendto+0x130/0x200 net/socket.c:2199\\n do_syscall_64+0xd8/0x1f0 arch/x86/entry/common.c:83\\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+0x5f6/0xc50 mm/slub.c:3888\\n kmalloc_reserve+0x13c/0x4a0 net/core/skbuff.c:577\\n __alloc_skb+0x35a/0x7c0 net/core/skbuff.c:668\\n alloc_skb include/linux/skbuff.h:1318 [inline]\\n __ip_append_data+0x49ab/0x68c0 net/ipv4/ip_output.c:1128\\n ip_append_data+0x1e7/0x260 net/ipv4/ip_output.c:1365\\n raw_sendmsg+0x22b1/0x2690 net/ipv4/raw.c:648\\n inet_sendmsg+0x27b/0x2a0 net/ipv4/af_inet.c:851\\n sock_sendmsg_nosec net/socket.c:730 [inline]\\n __sock_sendmsg+0x274/0x3c0 net/socket.c:745\\n __sys_sendto+0x62c/0x7b0 net/socket.c:2191\\n __do_sys_sendto net/socket.c:2203 [inline]\\n __se_sys_sendto net/socket.c:2199 [inline]\\n __x64_sys_sendto+0x130/0x200 net/socket.c:2199\\n do_syscall_64+0xd8/0x1f0 arch/x86/entry/common.c:83\\n entry_SYSCALL_64_after_hwframe+0x6d/0x75\\n\\nCPU: 1 PID: 15709 Comm: syz-executor.7 Not tainted 6.8.0-11567-gb3603fcb79b1 #25\\nHardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.3-1.fc39 04/01/2014\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.248\", \"versionStartIncluding\": \"5.10.180\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.198\", \"versionStartIncluding\": \"5.15.111\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.140\", \"versionStartIncluding\": \"6.1.28\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6.31\", \"versionStartIncluding\": \"6.4\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.8.10\", \"versionStartIncluding\": \"6.4\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.9\", \"versionStartIncluding\": \"6.4\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionStartIncluding\": \"4.14.315\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionStartIncluding\": \"4.19.283\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionStartIncluding\": \"5.4.243\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionStartIncluding\": \"6.2.15\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionStartIncluding\": \"6.3.2\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-01-19T12:17:47.098Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2024-36927\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-01-19T12:17:47.098Z\", \"dateReserved\": \"2024-05-30T15:25:07.069Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-05-30T15:29:20.275Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


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Sightings

Author Source Type Date

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



Detection rules are retrieved from Rulezet.