cve-2024-36927
Vulnerability from cvelistv5
Published
2024-05-30 15:29
Modified
2024-11-05 09:28
Severity ?
Summary
ipv4: Fix uninit-value access in __ip_make_skb()
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/5db08343ddb1b239320612036c398e4e1bb52818
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/f5c603ad4e6fcf42f84053e882ebe20184bb309e
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/fc1092f51567277509563800a3c56732070b6aa4
Impacted products
LinuxLinux
LinuxLinux
Show details on NVD website

To clipboard 

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                "id": "CVE-2024-36927",
                "options": [
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                  },
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                    "Automatable": "no"
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                  {
                    "Technical Impact": "partial"
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                "role": "CISA Coordinator",
                "timestamp": "2024-05-30T18:44:15.154993Z",
                "version": "2.0.3"
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          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
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          "dateUpdated": "2024-08-02T03:43:50.141Z",
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    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/ipv4/ip_output.c",
            "net/ipv4/raw.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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              "version": "6.4"
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              "status": "unaffected",
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              "status": "unaffected",
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          "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"
        }
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        "dateUpdated": "2024-11-05T09:28:13.996Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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      "references": [
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          "url": "https://git.kernel.org/stable/c/5db08343ddb1b239320612036c398e4e1bb52818"
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          "url": "https://git.kernel.org/stable/c/fc1092f51567277509563800a3c56732070b6aa4"
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      "title": "ipv4: Fix uninit-value access in __ip_make_skb()",
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  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2024-36927",
    "datePublished": "2024-05-30T15:29:20.275Z",
    "dateReserved": "2024-05-30T15:25:07.069Z",
    "dateUpdated": "2024-11-05T09:28:13.996Z",
    "state": "PUBLISHED"
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  "dataVersion": "5.1",
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    "nvd": "{\"cve\":{\"id\":\"CVE-2024-36927\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2024-05-30T16:15:15.957\",\"lastModified\":\"2024-05-30T18:18:58.870\",\"vulnStatus\":\"Awaiting Analysis\",\"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\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se resolvi\u00f3 la siguiente vulnerabilidad: ipv4: corrigi\u00f3 el acceso de valor uninit en __ip_make_skb() KMSAN inform\u00f3 el acceso de valor uninit en __ip_make_skb() [1]. __ip_make_skb() prueba HDRINCL para saber si el skb tiene icmphdr. Sin embargo, HDRINCL puede provocar una condici\u00f3n de ejecuci\u00f3n. Si llamar a setsockopt(2) con IP_HDRINCL cambia HDRINCL mientras se ejecuta __ip_make_skb(), la funci\u00f3n acceder\u00e1 a icmphdr en el skb incluso si no est\u00e1 incluido. Esto provoca el problema informado por KMSAN. Verifique FLOWI_FLAG_KNOWN_NH en fl4-\u0026gt;flowi4_flags en lugar de probar HDRINCL en el socket. Adem\u00e1s, fl4-\u0026gt;fl4_icmp_type y fl4-\u0026gt;fl4_icmp_code no est\u00e1n inicializados. Estas son una uni\u00f3n en la estructura flowi4 y se inicializan impl\u00edcitamente mediante flowi4_init_output(), pero no debemos confiar en un dise\u00f1o de uni\u00f3n espec\u00edfico. Inicial\u00edcelos expl\u00edcitamente en raw_sendmsg(). [1] ERROR: KMSAN: valor uninit en __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 net/socket.c : 730 [en l\u00ednea] __sock_sendmsg+0x274/0x3c0 net/Socket.c: 745 __sys_sendto+0x62c/0x7b0 net/Socket.c: 2191 __do_sys_sendto net/socket.c: 2203 [en l\u00ednea] __se_sys_sendto net/sows. ] __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 se cre\u00f3 en: slab_post_alloc_hook mm/slub.c :3804 [en l\u00ednea] slab_alloc_node mm/slub.c:3845 [en l\u00ednea] 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 [en l\u00ednea] __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 [en l\u00ednea] __sock_sendmsg+0x274/0x3c0 net/socket.c:745 __sys_sendto+0x62c/0x7b0 net / socket.c:2191 __do_sys_sendto net/socket.c:2203 [en l\u00ednea] __se_sys_sendto net/socket.c:2199 [en l\u00ednea] __x64_sys_sendto+0x130/0x200 net/socket.c:2199 do_syscall_64+0xd8/0x1f0 arch/x86/ent ry/ 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 Nombre de hardware: PC est\u00e1ndar QEMU (i440FX + PIIX, 1996), BIOS 1.16 .3-1.fc39 01/04/2014\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/5db08343ddb1b239320612036c398e4e1bb52818\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/f5c603ad4e6fcf42f84053e882ebe20184bb309e\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/fc1092f51567277509563800a3c56732070b6aa4\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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