CVE-2024-40954 (GCVE-0-2024-40954)
Vulnerability from cvelistv5 – Published: 2024-07-12 12:31 – Updated: 2026-08-05 11:34
VLAI
EPSS
VEX
Title
net: do not leave a dangling sk pointer, when socket creation fails
Summary
In the Linux kernel, the following vulnerability has been resolved:
net: do not leave a dangling sk pointer, when socket creation fails
It is possible to trigger a use-after-free by:
* attaching an fentry probe to __sock_release() and the probe calling the
bpf_get_socket_cookie() helper
* running traceroute -I 1.1.1.1 on a freshly booted VM
A KASAN enabled kernel will log something like below (decoded and stripped):
==================================================================
BUG: KASAN: slab-use-after-free in __sock_gen_cookie (./arch/x86/include/asm/atomic64_64.h:15 ./include/linux/atomic/atomic-arch-fallback.h:2583 ./include/linux/atomic/atomic-instrumented.h:1611 net/core/sock_diag.c:29)
Read of size 8 at addr ffff888007110dd8 by task traceroute/299
CPU: 2 PID: 299 Comm: traceroute Tainted: G E 6.10.0-rc2+ #2
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
Call Trace:
<TASK>
dump_stack_lvl (lib/dump_stack.c:117 (discriminator 1))
print_report (mm/kasan/report.c:378 mm/kasan/report.c:488)
? __sock_gen_cookie (./arch/x86/include/asm/atomic64_64.h:15 ./include/linux/atomic/atomic-arch-fallback.h:2583 ./include/linux/atomic/atomic-instrumented.h:1611 net/core/sock_diag.c:29)
kasan_report (mm/kasan/report.c:603)
? __sock_gen_cookie (./arch/x86/include/asm/atomic64_64.h:15 ./include/linux/atomic/atomic-arch-fallback.h:2583 ./include/linux/atomic/atomic-instrumented.h:1611 net/core/sock_diag.c:29)
kasan_check_range (mm/kasan/generic.c:183 mm/kasan/generic.c:189)
__sock_gen_cookie (./arch/x86/include/asm/atomic64_64.h:15 ./include/linux/atomic/atomic-arch-fallback.h:2583 ./include/linux/atomic/atomic-instrumented.h:1611 net/core/sock_diag.c:29)
bpf_get_socket_ptr_cookie (./arch/x86/include/asm/preempt.h:94 ./include/linux/sock_diag.h:42 net/core/filter.c:5094 net/core/filter.c:5092)
bpf_prog_875642cf11f1d139___sock_release+0x6e/0x8e
bpf_trampoline_6442506592+0x47/0xaf
__sock_release (net/socket.c:652)
__sock_create (net/socket.c:1601)
...
Allocated by task 299 on cpu 2 at 78.328492s:
kasan_save_stack (mm/kasan/common.c:48)
kasan_save_track (mm/kasan/common.c:68)
__kasan_slab_alloc (mm/kasan/common.c:312 mm/kasan/common.c:338)
kmem_cache_alloc_noprof (mm/slub.c:3941 mm/slub.c:4000 mm/slub.c:4007)
sk_prot_alloc (net/core/sock.c:2075)
sk_alloc (net/core/sock.c:2134)
inet_create (net/ipv4/af_inet.c:327 net/ipv4/af_inet.c:252)
__sock_create (net/socket.c:1572)
__sys_socket (net/socket.c:1660 net/socket.c:1644 net/socket.c:1706)
__x64_sys_socket (net/socket.c:1718)
do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83)
entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130)
Freed by task 299 on cpu 2 at 78.328502s:
kasan_save_stack (mm/kasan/common.c:48)
kasan_save_track (mm/kasan/common.c:68)
kasan_save_free_info (mm/kasan/generic.c:582)
poison_slab_object (mm/kasan/common.c:242)
__kasan_slab_free (mm/kasan/common.c:256)
kmem_cache_free (mm/slub.c:4437 mm/slub.c:4511)
__sk_destruct (net/core/sock.c:2117 net/core/sock.c:2208)
inet_create (net/ipv4/af_inet.c:397 net/ipv4/af_inet.c:252)
__sock_create (net/socket.c:1572)
__sys_socket (net/socket.c:1660 net/socket.c:1644 net/socket.c:1706)
__x64_sys_socket (net/socket.c:1718)
do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83)
entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130)
Fix this by clearing the struct socket reference in sk_common_release() to cover
all protocol families create functions, which may already attached the
reference to the sk object with sock_init_data().
Severity
7.8 (High)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2024-09-10 17:03 UTC
Assigner
References
6 references
Impacted products
2 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Linux | Linux |
Affected:
c5dbb89fc2ac013afe67b9e4fcb3743c02b567cd , < 78e4aa528a7b1204219d808310524344f627d069
(git)
Affected: c5dbb89fc2ac013afe67b9e4fcb3743c02b567cd , < 893eeba94c40d513cd0fe6539330ebdaea208c0e (git) Affected: c5dbb89fc2ac013afe67b9e4fcb3743c02b567cd , < 454c454ed645fed051216b79622f7cb69c1638f5 (git) Affected: c5dbb89fc2ac013afe67b9e4fcb3743c02b567cd , < 5dfe2408fd7dc4d2e7ac38a116ff0a37b1cfd3b9 (git) Affected: c5dbb89fc2ac013afe67b9e4fcb3743c02b567cd , < 6cd4a78d962bebbaf8beb7d2ead3f34120e3f7b2 (git) |
guessed | |
| Linux | Linux |
Affected:
5.12
Unaffected: 0 , < 5.12 (semver) Unaffected: 5.15.162 , ≤ 5.15.* (semver) Unaffected: 6.1.96 , ≤ 6.1.* (semver) Unaffected: 6.6.36 , ≤ 6.6.* (semver) Unaffected: 6.9.7 , ≤ 6.9.* (semver) Unaffected: 6.10 , ≤ * (original_commit_for_fix) |
guessed |
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: do not leave a dangling sk pointer, when socket creation fails\n\nIt is possible to trigger a use-after-free by:\n * attaching an fentry probe to __sock_release() and the probe calling the\n bpf_get_socket_cookie() helper\n * running traceroute -I 1.1.1.1 on a freshly booted VM\n\nA KASAN enabled kernel will log something like below (decoded and stripped):\n==================================================================\nBUG: KASAN: slab-use-after-free in __sock_gen_cookie (./arch/x86/include/asm/atomic64_64.h:15 ./include/linux/atomic/atomic-arch-fallback.h:2583 ./include/linux/atomic/atomic-instrumented.h:1611 net/core/sock_diag.c:29)\nRead of size 8 at addr ffff888007110dd8 by task traceroute/299\n\nCPU: 2 PID: 299 Comm: traceroute Tainted: G E 6.10.0-rc2+ #2\nHardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.2-debian-1.16.2-1 04/01/2014\nCall Trace:\n \u003cTASK\u003e\ndump_stack_lvl (lib/dump_stack.c:117 (discriminator 1))\nprint_report (mm/kasan/report.c:378 mm/kasan/report.c:488)\n? __sock_gen_cookie (./arch/x86/include/asm/atomic64_64.h:15 ./include/linux/atomic/atomic-arch-fallback.h:2583 ./include/linux/atomic/atomic-instrumented.h:1611 net/core/sock_diag.c:29)\nkasan_report (mm/kasan/report.c:603)\n? __sock_gen_cookie (./arch/x86/include/asm/atomic64_64.h:15 ./include/linux/atomic/atomic-arch-fallback.h:2583 ./include/linux/atomic/atomic-instrumented.h:1611 net/core/sock_diag.c:29)\nkasan_check_range (mm/kasan/generic.c:183 mm/kasan/generic.c:189)\n__sock_gen_cookie (./arch/x86/include/asm/atomic64_64.h:15 ./include/linux/atomic/atomic-arch-fallback.h:2583 ./include/linux/atomic/atomic-instrumented.h:1611 net/core/sock_diag.c:29)\nbpf_get_socket_ptr_cookie (./arch/x86/include/asm/preempt.h:94 ./include/linux/sock_diag.h:42 net/core/filter.c:5094 net/core/filter.c:5092)\nbpf_prog_875642cf11f1d139___sock_release+0x6e/0x8e\nbpf_trampoline_6442506592+0x47/0xaf\n__sock_release (net/socket.c:652)\n__sock_create (net/socket.c:1601)\n...\nAllocated by task 299 on cpu 2 at 78.328492s:\nkasan_save_stack (mm/kasan/common.c:48)\nkasan_save_track (mm/kasan/common.c:68)\n__kasan_slab_alloc (mm/kasan/common.c:312 mm/kasan/common.c:338)\nkmem_cache_alloc_noprof (mm/slub.c:3941 mm/slub.c:4000 mm/slub.c:4007)\nsk_prot_alloc (net/core/sock.c:2075)\nsk_alloc (net/core/sock.c:2134)\ninet_create (net/ipv4/af_inet.c:327 net/ipv4/af_inet.c:252)\n__sock_create (net/socket.c:1572)\n__sys_socket (net/socket.c:1660 net/socket.c:1644 net/socket.c:1706)\n__x64_sys_socket (net/socket.c:1718)\ndo_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83)\nentry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130)\n\nFreed by task 299 on cpu 2 at 78.328502s:\nkasan_save_stack (mm/kasan/common.c:48)\nkasan_save_track (mm/kasan/common.c:68)\nkasan_save_free_info (mm/kasan/generic.c:582)\npoison_slab_object (mm/kasan/common.c:242)\n__kasan_slab_free (mm/kasan/common.c:256)\nkmem_cache_free (mm/slub.c:4437 mm/slub.c:4511)\n__sk_destruct (net/core/sock.c:2117 net/core/sock.c:2208)\ninet_create (net/ipv4/af_inet.c:397 net/ipv4/af_inet.c:252)\n__sock_create (net/socket.c:1572)\n__sys_socket (net/socket.c:1660 net/socket.c:1644 net/socket.c:1706)\n__x64_sys_socket (net/socket.c:1718)\ndo_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83)\nentry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130)\n\nFix this by clearing the struct socket reference in sk_common_release() to cover\nall protocol families create functions, which may already attached the\nreference to the sk object with sock_init_data()."
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: do not leave a dangling sk pointer, when socket creation fails\n\nIt is possible to trigger a use-after-free by:\n * attaching an fentry probe to __sock_release() and the probe calling the\n bpf_get_socket_cookie() helper\n * running traceroute -I 1.1.1.1 on a freshly booted VM\n\nA KASAN enabled kernel will log something like below (decoded and stripped):\n==================================================================\nBUG: KASAN: slab-use-after-free in __sock_gen_cookie (./arch/x86/include/asm/atomic64_64.h:15 ./include/linux/atomic/atomic-arch-fallback.h:2583 ./include/linux/atomic/atomic-instrumented.h:1611 net/core/sock_diag.c:29)\nRead of size 8 at addr ffff888007110dd8 by task traceroute/299\n\nCPU: 2 PID: 299 Comm: traceroute Tainted: G E 6.10.0-rc2+ #2\nHardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.2-debian-1.16.2-1 04/01/2014\nCall Trace:\n \u003cTASK\u003e\ndump_stack_lvl (lib/dump_stack.c:117 (discriminator 1))\nprint_report (mm/kasan/report.c:378 mm/kasan/report.c:488)\n? __sock_gen_cookie (./arch/x86/include/asm/atomic64_64.h:15 ./include/linux/atomic/atomic-arch-fallback.h:2583 ./include/linux/atomic/atomic-instrumented.h:1611 net/core/sock_diag.c:29)\nkasan_report (mm/kasan/report.c:603)\n? __sock_gen_cookie (./arch/x86/include/asm/atomic64_64.h:15 ./include/linux/atomic/atomic-arch-fallback.h:2583 ./include/linux/atomic/atomic-instrumented.h:1611 net/core/sock_diag.c:29)\nkasan_check_range (mm/kasan/generic.c:183 mm/kasan/generic.c:189)\n__sock_gen_cookie (./arch/x86/include/asm/atomic64_64.h:15 ./include/linux/atomic/atomic-arch-fallback.h:2583 ./include/linux/atomic/atomic-instrumented.h:1611 net/core/sock_diag.c:29)\nbpf_get_socket_ptr_cookie (./arch/x86/include/asm/preempt.h:94 ./include/linux/sock_diag.h:42 net/core/filter.c:5094 net/core/filter.c:5092)\nbpf_prog_875642cf11f1d139___sock_release+0x6e/0x8e\nbpf_trampoline_6442506592+0x47/0xaf\n__sock_release (net/socket.c:652)\n__sock_create (net/socket.c:1601)\n...\nAllocated by task 299 on cpu 2 at 78.328492s:\nkasan_save_stack (mm/kasan/common.c:48)\nkasan_save_track (mm/kasan/common.c:68)\n__kasan_slab_alloc (mm/kasan/common.c:312 mm/kasan/common.c:338)\nkmem_cache_alloc_noprof (mm/slub.c:3941 mm/slub.c:4000 mm/slub.c:4007)\nsk_prot_alloc (net/core/sock.c:2075)\nsk_alloc (net/core/sock.c:2134)\ninet_create (net/ipv4/af_inet.c:327 net/ipv4/af_inet.c:252)\n__sock_create (net/socket.c:1572)\n__sys_socket (net/socket.c:1660 net/socket.c:1644 net/socket.c:1706)\n__x64_sys_socket (net/socket.c:1718)\ndo_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83)\nentry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130)\n\nFreed by task 299 on cpu 2 at 78.328502s:\nkasan_save_stack (mm/kasan/common.c:48)\nkasan_save_track (mm/kasan/common.c:68)\nkasan_save_free_info (mm/kasan/generic.c:582)\npoison_slab_object (mm/kasan/common.c:242)\n__kasan_slab_free (mm/kasan/common.c:256)\nkmem_cache_free (mm/slub.c:4437 mm/slub.c:4511)\n__sk_destruct (net/core/sock.c:2117 net/core/sock.c:2208)\ninet_create (net/ipv4/af_inet.c:397 net/ipv4/af_inet.c:252)\n__sock_create (net/socket.c:1572)\n__sys_socket (net/socket.c:1660 net/socket.c:1644 net/socket.c:1706)\n__x64_sys_socket (net/socket.c:1718)\ndo_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83)\nentry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130)\n\nFix this by clearing the struct socket reference in sk_common_release() to cover\nall protocol families create functions, which may already attached the\nreference to the sk object with sock_init_data()."
},
{
"lang": "es",
"value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: net: no deja un puntero sk colgando cuando falla la creaci\u00f3n del socket. Es posible activar un use-after-free: * adjuntando una sonda fentry a __sock_release() y el sonda que llama al asistente bpf_get_socket_cookie() * ejecuta traceroute -I 1.1.1.1 en una m\u00e1quina virtual reci\u00e9n iniciada. Un kernel habilitado para KASAN registrar\u00e1 algo como lo siguiente (decodificado y eliminado): =============== ==================================================== = ERROR: KASAN: slab-use-after-free en __sock_gen_cookie (./arch/x86/include/asm/atomic64_64.h:15 ./include/linux/atomic/atomic-arch-fallback.h:2583 ./include /linux/atomic/atomic-instrumented.h:1611 net/core/sock_diag.c:29) Lectura de tama\u00f1o 8 en la direcci\u00f3n ffff888007110dd8 mediante tarea traceroute/299 CPU: 2 PID: 299 Comm: traceroute Contaminado: GE 6.10.0- rc2+ #2 Nombre del hardware: PC est\u00e1ndar QEMU (i440FX + PIIX, 1996), BIOS 1.16.2-debian-1.16.2-1 01/04/2014 Seguimiento de llamadas: dump_stack_lvl (lib/dump_stack.c:117 ( discriminador 1)) print_report (mm/kasan/report.c:378 mm/kasan/report.c:488)? __sock_gen_cookie (./arch/x86/include/asm/atomic64_64.h:15 ./include/linux/atomic/atomic-arch-fallback.h:2583 ./include/linux/atomic/atomic-instrumented.h:1611 neto /core/sock_diag.c:29) kasan_report (mm/kasan/report.c:603)? __sock_gen_cookie (./arch/x86/include/asm/atomic64_64.h:15 ./include/linux/atomic/atomic-arch-fallback.h:2583 ./include/linux/atomic/atomic-instrumented.h:1611 neto /core/sock_diag.c:29) kasan_check_range (mm/kasan/generic.c:183 mm/kasan/generic.c:189) __sock_gen_cookie (./arch/x86/include/asm/atomic64_64.h:15 ./include /linux/atomic/atomic-arch-fallback.h:2583 ./include/linux/atomic/atomic-instrumented.h:1611 net/core/sock_diag.c:29) bpf_get_socket_ptr_cookie (./arch/x86/include/asm /preempt.h:94 ./include/linux/sock_diag.h:42 net/core/filter.c:5094 net/core/filter.c:5092) bpf_prog_875642cf11f1d139___sock_release+0x6e/0x8e bpf_trampoline_6442506592+0x47/0xaf __ calcet\u00edn_release (net/ socket.c:652) __sock_create (net/socket.c:1601) ... Asignado por la tarea 299 en la CPU 2 en 78.328492s: kasan_save_stack (mm/kasan/common.c:48) kasan_save_track (mm/kasan/common. c:68) __kasan_slab_alloc (mm/kasan/common.c:312 mm/kasan/common.c:338) kmem_cache_alloc_noprof (mm/slub.c:3941 mm/slub.c:4000 mm/slub.c:4007) sk_prot_alloc (net/core/sock.c:2075) sk_alloc (net/core/sock.c:2134) inet_create (net/ipv4/af_inet.c:327 net/ipv4/af_inet.c:252) __sock_create (net/socket. c:1572) __sys_socket (net/socket.c:1660 net/socket.c:1644 net/socket.c:1706) __x64_sys_socket (net/socket.c:1718) do_syscall_64 (arch/x86/entry/common.c: 52 arch/x86/entry/common.c:83) Entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) Liberado por la tarea 299 en la CPU 2 a las 78.328502s: kasan_save_stack (mm/kasan/common.c:48) kasan_save_track (mm/kasan/common.c:68) kasan_save_free_info (mm/kasan/generic.c:582) veneno_slab_object (mm/kasan/common.c:242) __kasan_slab_free (mm/kasan/common.c:256) kmem_cache_free ( mm/slub.c:4437 mm/slub.c:4511) __sk_destruct (net/core/sock.c:2117 net/core/sock.c:2208) inet_create (net/ipv4/af_inet.c:397 net/ipv4 /af_inet.c:252) __sock_create (net/socket.c:1572) __sys_socket (net/socket.c:1660 net/socket.c:1644 net/socket.c:1706) __x64_sys_socket (net/socket.c:1718 ) do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83) Entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) Solucione este problema borrando la referencia del socket de estructura en sk_common_release () para cubrir todas las familias de protocolos, cree funciones, que pueden ya adjuntar la referencia al objeto sk con sock_init_data()."
}
],
"id": "CVE-2024-40954",
"lastModified": "2024-11-21T09:31:56.400",
"metrics": {
"cvssMetricV31": [
{
"cvssData": {
"attackComplexity": "LOW",
"attackVector": "LOCAL",
"availabilityImpact": "HIGH",
"baseScore": 7.8,
"baseSeverity": "HIGH",
"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"privilegesRequired": "LOW",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
"version": "3.1"
},
"exploitabilityScore": 1.8,
"impactScore": 5.9,
"source": "nvd@nist.gov",
"type": "Primary"
}
]
},
"published": "2024-07-12T13:15:17.627",
"references": [
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"tags": [
"Patch"
],
"url": "https://git.kernel.org/stable/c/454c454ed645fed051216b79622f7cb69c1638f5"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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},
{
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"url": "https://git.kernel.org/stable/c/6cd4a78d962bebbaf8beb7d2ead3f34120e3f7b2"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"tags": [
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],
"url": "https://git.kernel.org/stable/c/893eeba94c40d513cd0fe6539330ebdaea208c0e"
},
{
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"tags": [
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],
"url": "https://git.kernel.org/stable/c/454c454ed645fed051216b79622f7cb69c1638f5"
},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"tags": [
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],
"url": "https://git.kernel.org/stable/c/5dfe2408fd7dc4d2e7ac38a116ff0a37b1cfd3b9"
},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"tags": [
"Patch"
],
"url": "https://git.kernel.org/stable/c/6cd4a78d962bebbaf8beb7d2ead3f34120e3f7b2"
},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"tags": [
"Patch"
],
"url": "https://git.kernel.org/stable/c/78e4aa528a7b1204219d808310524344f627d069"
},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"tags": [
"Patch"
],
"url": "https://git.kernel.org/stable/c/893eeba94c40d513cd0fe6539330ebdaea208c0e"
}
],
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"vulnStatus": "Modified",
"weaknesses": [
{
"description": [
{
"lang": "en",
"value": "CWE-416"
}
],
"source": "nvd@nist.gov",
"type": "Primary"
}
]
},
"nvd": {
"cve": {
"affected": [
{
"affectedData": [
{
"defaultStatus": "unaffected",
"product": "Linux",
"programFiles": [
"net/core/sock.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"lessThan": "78e4aa528a7b1204219d808310524344f627d069",
"status": "affected",
"version": "c5dbb89fc2ac013afe67b9e4fcb3743c02b567cd",
"versionType": "git"
},
{
"lessThan": "893eeba94c40d513cd0fe6539330ebdaea208c0e",
"status": "affected",
"version": "c5dbb89fc2ac013afe67b9e4fcb3743c02b567cd",
"versionType": "git"
},
{
"lessThan": "454c454ed645fed051216b79622f7cb69c1638f5",
"status": "affected",
"version": "c5dbb89fc2ac013afe67b9e4fcb3743c02b567cd",
"versionType": "git"
},
{
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"status": "affected",
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"versionType": "git"
},
{
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"status": "affected",
"version": "c5dbb89fc2ac013afe67b9e4fcb3743c02b567cd",
"versionType": "git"
}
]
},
{
"defaultStatus": "affected",
"product": "Linux",
"programFiles": [
"net/core/sock.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"status": "affected",
"version": "5.12"
},
{
"lessThan": "5.12",
"status": "unaffected",
"version": "0",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.15.*",
"status": "unaffected",
"version": "5.15.162",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.1.*",
"status": "unaffected",
"version": "6.1.96",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.6.*",
"status": "unaffected",
"version": "6.6.36",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.9.*",
"status": "unaffected",
"version": "6.9.7",
"versionType": "semver"
},
{
"lessThanOrEqual": "*",
"status": "unaffected",
"version": "6.10",
"versionType": "original_commit_for_fix"
}
]
}
],
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}
],
"configurations": [
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"matchCriteriaId": "BD852924-11EF-4EBB-B88D-50A6300754D3",
"versionEndExcluding": "5.15.162",
"versionStartIncluding": "5.12",
"vulnerable": true
},
{
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},
{
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"versionEndExcluding": "6.6.36",
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},
{
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"matchCriteriaId": "0A047AF2-94AC-4A3A-B32D-6AB930D8EF1C",
"versionEndExcluding": "6.9.7",
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},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:6.10:rc1:*:*:*:*:*:*",
"matchCriteriaId": "2EBB4392-5FA6-4DA9-9772-8F9C750109FA",
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},
{
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"matchCriteriaId": "331C2F14-12C7-45D5-893D-8C52EE38EA10",
"vulnerable": true
},
{
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"matchCriteriaId": "3173713D-909A-4DD3-9DD4-1E171EB057EE",
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{
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"matchCriteriaId": "79F18AFA-40F7-43F0-BA30-7BDB65F918B9",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
]
}
],
"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: do not leave a dangling sk pointer, when socket creation fails\n\nIt is possible to trigger a use-after-free by:\n * attaching an fentry probe to __sock_release() and the probe calling the\n bpf_get_socket_cookie() helper\n * running traceroute -I 1.1.1.1 on a freshly booted VM\n\nA KASAN enabled kernel will log something like below (decoded and stripped):\n==================================================================\nBUG: KASAN: slab-use-after-free in __sock_gen_cookie (./arch/x86/include/asm/atomic64_64.h:15 ./include/linux/atomic/atomic-arch-fallback.h:2583 ./include/linux/atomic/atomic-instrumented.h:1611 net/core/sock_diag.c:29)\nRead of size 8 at addr ffff888007110dd8 by task traceroute/299\n\nCPU: 2 PID: 299 Comm: traceroute Tainted: G E 6.10.0-rc2+ #2\nHardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.2-debian-1.16.2-1 04/01/2014\nCall Trace:\n \u003cTASK\u003e\ndump_stack_lvl (lib/dump_stack.c:117 (discriminator 1))\nprint_report (mm/kasan/report.c:378 mm/kasan/report.c:488)\n? __sock_gen_cookie (./arch/x86/include/asm/atomic64_64.h:15 ./include/linux/atomic/atomic-arch-fallback.h:2583 ./include/linux/atomic/atomic-instrumented.h:1611 net/core/sock_diag.c:29)\nkasan_report (mm/kasan/report.c:603)\n? __sock_gen_cookie (./arch/x86/include/asm/atomic64_64.h:15 ./include/linux/atomic/atomic-arch-fallback.h:2583 ./include/linux/atomic/atomic-instrumented.h:1611 net/core/sock_diag.c:29)\nkasan_check_range (mm/kasan/generic.c:183 mm/kasan/generic.c:189)\n__sock_gen_cookie (./arch/x86/include/asm/atomic64_64.h:15 ./include/linux/atomic/atomic-arch-fallback.h:2583 ./include/linux/atomic/atomic-instrumented.h:1611 net/core/sock_diag.c:29)\nbpf_get_socket_ptr_cookie (./arch/x86/include/asm/preempt.h:94 ./include/linux/sock_diag.h:42 net/core/filter.c:5094 net/core/filter.c:5092)\nbpf_prog_875642cf11f1d139___sock_release+0x6e/0x8e\nbpf_trampoline_6442506592+0x47/0xaf\n__sock_release (net/socket.c:652)\n__sock_create (net/socket.c:1601)\n...\nAllocated by task 299 on cpu 2 at 78.328492s:\nkasan_save_stack (mm/kasan/common.c:48)\nkasan_save_track (mm/kasan/common.c:68)\n__kasan_slab_alloc (mm/kasan/common.c:312 mm/kasan/common.c:338)\nkmem_cache_alloc_noprof (mm/slub.c:3941 mm/slub.c:4000 mm/slub.c:4007)\nsk_prot_alloc (net/core/sock.c:2075)\nsk_alloc (net/core/sock.c:2134)\ninet_create (net/ipv4/af_inet.c:327 net/ipv4/af_inet.c:252)\n__sock_create (net/socket.c:1572)\n__sys_socket (net/socket.c:1660 net/socket.c:1644 net/socket.c:1706)\n__x64_sys_socket (net/socket.c:1718)\ndo_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83)\nentry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130)\n\nFreed by task 299 on cpu 2 at 78.328502s:\nkasan_save_stack (mm/kasan/common.c:48)\nkasan_save_track (mm/kasan/common.c:68)\nkasan_save_free_info (mm/kasan/generic.c:582)\npoison_slab_object (mm/kasan/common.c:242)\n__kasan_slab_free (mm/kasan/common.c:256)\nkmem_cache_free (mm/slub.c:4437 mm/slub.c:4511)\n__sk_destruct (net/core/sock.c:2117 net/core/sock.c:2208)\ninet_create (net/ipv4/af_inet.c:397 net/ipv4/af_inet.c:252)\n__sock_create (net/socket.c:1572)\n__sys_socket (net/socket.c:1660 net/socket.c:1644 net/socket.c:1706)\n__x64_sys_socket (net/socket.c:1718)\ndo_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83)\nentry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130)\n\nFix this by clearing the struct socket reference in sk_common_release() to cover\nall protocol families create functions, which may already attached the\nreference to the sk object with sock_init_data()."
},
{
"lang": "es",
"value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: net: no deja un puntero sk colgando cuando falla la creaci\u00f3n del socket. Es posible activar un use-after-free: * adjuntando una sonda fentry a __sock_release() y el sonda que llama al asistente bpf_get_socket_cookie() * ejecuta traceroute -I 1.1.1.1 en una m\u00e1quina virtual reci\u00e9n iniciada. Un kernel habilitado para KASAN registrar\u00e1 algo como lo siguiente (decodificado y eliminado): =============== ==================================================== = ERROR: KASAN: slab-use-after-free en __sock_gen_cookie (./arch/x86/include/asm/atomic64_64.h:15 ./include/linux/atomic/atomic-arch-fallback.h:2583 ./include /linux/atomic/atomic-instrumented.h:1611 net/core/sock_diag.c:29) Lectura de tama\u00f1o 8 en la direcci\u00f3n ffff888007110dd8 mediante tarea traceroute/299 CPU: 2 PID: 299 Comm: traceroute Contaminado: GE 6.10.0- rc2+ #2 Nombre del hardware: PC est\u00e1ndar QEMU (i440FX + PIIX, 1996), BIOS 1.16.2-debian-1.16.2-1 01/04/2014 Seguimiento de llamadas: dump_stack_lvl (lib/dump_stack.c:117 ( discriminador 1)) print_report (mm/kasan/report.c:378 mm/kasan/report.c:488)? __sock_gen_cookie (./arch/x86/include/asm/atomic64_64.h:15 ./include/linux/atomic/atomic-arch-fallback.h:2583 ./include/linux/atomic/atomic-instrumented.h:1611 neto /core/sock_diag.c:29) kasan_report (mm/kasan/report.c:603)? __sock_gen_cookie (./arch/x86/include/asm/atomic64_64.h:15 ./include/linux/atomic/atomic-arch-fallback.h:2583 ./include/linux/atomic/atomic-instrumented.h:1611 neto /core/sock_diag.c:29) kasan_check_range (mm/kasan/generic.c:183 mm/kasan/generic.c:189) __sock_gen_cookie (./arch/x86/include/asm/atomic64_64.h:15 ./include /linux/atomic/atomic-arch-fallback.h:2583 ./include/linux/atomic/atomic-instrumented.h:1611 net/core/sock_diag.c:29) bpf_get_socket_ptr_cookie (./arch/x86/include/asm /preempt.h:94 ./include/linux/sock_diag.h:42 net/core/filter.c:5094 net/core/filter.c:5092) bpf_prog_875642cf11f1d139___sock_release+0x6e/0x8e bpf_trampoline_6442506592+0x47/0xaf __ calcet\u00edn_release (net/ socket.c:652) __sock_create (net/socket.c:1601) ... Asignado por la tarea 299 en la CPU 2 en 78.328492s: kasan_save_stack (mm/kasan/common.c:48) kasan_save_track (mm/kasan/common. c:68) __kasan_slab_alloc (mm/kasan/common.c:312 mm/kasan/common.c:338) kmem_cache_alloc_noprof (mm/slub.c:3941 mm/slub.c:4000 mm/slub.c:4007) sk_prot_alloc (net/core/sock.c:2075) sk_alloc (net/core/sock.c:2134) inet_create (net/ipv4/af_inet.c:327 net/ipv4/af_inet.c:252) __sock_create (net/socket. c:1572) __sys_socket (net/socket.c:1660 net/socket.c:1644 net/socket.c:1706) __x64_sys_socket (net/socket.c:1718) do_syscall_64 (arch/x86/entry/common.c: 52 arch/x86/entry/common.c:83) Entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) Liberado por la tarea 299 en la CPU 2 a las 78.328502s: kasan_save_stack (mm/kasan/common.c:48) kasan_save_track (mm/kasan/common.c:68) kasan_save_free_info (mm/kasan/generic.c:582) veneno_slab_object (mm/kasan/common.c:242) __kasan_slab_free (mm/kasan/common.c:256) kmem_cache_free ( mm/slub.c:4437 mm/slub.c:4511) __sk_destruct (net/core/sock.c:2117 net/core/sock.c:2208) inet_create (net/ipv4/af_inet.c:397 net/ipv4 /af_inet.c:252) __sock_create (net/socket.c:1572) __sys_socket (net/socket.c:1660 net/socket.c:1644 net/socket.c:1706) __x64_sys_socket (net/socket.c:1718 ) do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83) Entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) Solucione este problema borrando la referencia del socket de estructura en sk_common_release () para cubrir todas las familias de protocolos, cree funciones, que pueden ya adjuntar la referencia al objeto sk con sock_init_data()."
}
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"id": "CVE-2024-40954",
"lastModified": "2026-08-04T11:19:09.170",
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"programFiles": [
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{
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},
{
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"status": "unaffected",
"version": "6.10",
"versionType": "original_commit_for_fix"
}
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}
],
"cpeApplicability": [
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "5.15.162",
"versionStartIncluding": "5.12",
"vulnerable": true
},
{
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"versionEndExcluding": "6.1.96",
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"vulnerable": true
},
{
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},
{
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},
{
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}
],
"negate": false,
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]
}
],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: do not leave a dangling sk pointer, when socket creation fails\n\nIt is possible to trigger a use-after-free by:\n * attaching an fentry probe to __sock_release() and the probe calling the\n bpf_get_socket_cookie() helper\n * running traceroute -I 1.1.1.1 on a freshly booted VM\n\nA KASAN enabled kernel will log something like below (decoded and stripped):\n==================================================================\nBUG: KASAN: slab-use-after-free in __sock_gen_cookie (./arch/x86/include/asm/atomic64_64.h:15 ./include/linux/atomic/atomic-arch-fallback.h:2583 ./include/linux/atomic/atomic-instrumented.h:1611 net/core/sock_diag.c:29)\nRead of size 8 at addr ffff888007110dd8 by task traceroute/299\n\nCPU: 2 PID: 299 Comm: traceroute Tainted: G E 6.10.0-rc2+ #2\nHardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.2-debian-1.16.2-1 04/01/2014\nCall Trace:\n \u003cTASK\u003e\ndump_stack_lvl (lib/dump_stack.c:117 (discriminator 1))\nprint_report (mm/kasan/report.c:378 mm/kasan/report.c:488)\n? __sock_gen_cookie (./arch/x86/include/asm/atomic64_64.h:15 ./include/linux/atomic/atomic-arch-fallback.h:2583 ./include/linux/atomic/atomic-instrumented.h:1611 net/core/sock_diag.c:29)\nkasan_report (mm/kasan/report.c:603)\n? __sock_gen_cookie (./arch/x86/include/asm/atomic64_64.h:15 ./include/linux/atomic/atomic-arch-fallback.h:2583 ./include/linux/atomic/atomic-instrumented.h:1611 net/core/sock_diag.c:29)\nkasan_check_range (mm/kasan/generic.c:183 mm/kasan/generic.c:189)\n__sock_gen_cookie (./arch/x86/include/asm/atomic64_64.h:15 ./include/linux/atomic/atomic-arch-fallback.h:2583 ./include/linux/atomic/atomic-instrumented.h:1611 net/core/sock_diag.c:29)\nbpf_get_socket_ptr_cookie (./arch/x86/include/asm/preempt.h:94 ./include/linux/sock_diag.h:42 net/core/filter.c:5094 net/core/filter.c:5092)\nbpf_prog_875642cf11f1d139___sock_release+0x6e/0x8e\nbpf_trampoline_6442506592+0x47/0xaf\n__sock_release (net/socket.c:652)\n__sock_create (net/socket.c:1601)\n...\nAllocated by task 299 on cpu 2 at 78.328492s:\nkasan_save_stack (mm/kasan/common.c:48)\nkasan_save_track (mm/kasan/common.c:68)\n__kasan_slab_alloc (mm/kasan/common.c:312 mm/kasan/common.c:338)\nkmem_cache_alloc_noprof (mm/slub.c:3941 mm/slub.c:4000 mm/slub.c:4007)\nsk_prot_alloc (net/core/sock.c:2075)\nsk_alloc (net/core/sock.c:2134)\ninet_create (net/ipv4/af_inet.c:327 net/ipv4/af_inet.c:252)\n__sock_create (net/socket.c:1572)\n__sys_socket (net/socket.c:1660 net/socket.c:1644 net/socket.c:1706)\n__x64_sys_socket (net/socket.c:1718)\ndo_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83)\nentry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130)\n\nFreed by task 299 on cpu 2 at 78.328502s:\nkasan_save_stack (mm/kasan/common.c:48)\nkasan_save_track (mm/kasan/common.c:68)\nkasan_save_free_info (mm/kasan/generic.c:582)\npoison_slab_object (mm/kasan/common.c:242)\n__kasan_slab_free (mm/kasan/common.c:256)\nkmem_cache_free (mm/slub.c:4437 mm/slub.c:4511)\n__sk_destruct (net/core/sock.c:2117 net/core/sock.c:2208)\ninet_create (net/ipv4/af_inet.c:397 net/ipv4/af_inet.c:252)\n__sock_create (net/socket.c:1572)\n__sys_socket (net/socket.c:1660 net/socket.c:1644 net/socket.c:1706)\n__x64_sys_socket (net/socket.c:1718)\ndo_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83)\nentry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130)\n\nFix this by clearing the struct socket reference in sk_common_release() to cover\nall protocol families create functions, which may already attached the\nreference to the sk object with sock_init_data()."
}
],
"metrics": [
{
"cvssV3_1": {
"baseScore": 7.8,
"baseSeverity": "HIGH",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
"version": "3.1"
},
"scenarios": [
{
"lang": "en",
"value": "AV:L - The dangling pointer is created by the local `socket(2)` syscall reaching `__sock_create()` \u2192 `inet_create()` and failing after `sock_init_data()`; no packet or remote peer data is involved in reaching the vulnerable code. The dereference likewise happens in the syscalling task\u0027s own context.\nAC:L - `ping_init_sock()` returns -EACCES for every user under the kernel-default empty `ping_group_range` ([1,0]), so `socket(AF_INET, SOCK_DGRAM, IPPROTO_ICMP)` frees `sk` and leaves `sock-\u003esk` dangling deterministically on every attempt, with no race to win and no memory layout outside the attacker\u0027s influence. On a target running the socket-lifecycle eBPF instrumentation that constitutes the vulnerable configuration, the freed-object access follows unconditionally.\nPR:L - Any ordinary unprivileged local account \u2014 including an unprivileged container tenant \u2014 can issue the failing `socket()` call; there is no capability check, no user-namespace requirement, and even `traceroute` run by a normal user triggers it. The privileges needed to install the tracing probe belong to the host\u0027s monitoring stack, not to the attacker.\nUI:N - The attacker performs the entire sequence with a single syscall from their own process; no other user must open a file, mount anything, or take any action.\nS:U - The freed `struct sock` and the corrupting access are both inside the kernel\u0027s own security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - This is a slab use-after-free read of the freed `struct sock` (`atomic64_read(\u0026sk-\u003esk_cookie)` at a controllable offset into a reallocated object), and the value read is returned to the reader \u2014 a UAF read of kernel heap contents that can disclose whatever has been sprayed into the reclaimed slot.\nI:H - `__sock_gen_cookie()` does not merely read: with `sk_cookie == 0` it performs an `atomic64_cmpxchg()`, writing 8 bytes into the freed object, so a reallocated victim structure occupying that slot is corrupted at a fixed offset. A use-after-free write into sprayed heap memory is a real corruption primitive with control-flow-hijack potential.\nA:H - The use-after-free reliably produces KASAN slab-use-after-free reports and, on a production kernel, corrupts arbitrary reclaimed slab objects, causing oopses and panics; the trigger can be repeated in a tight loop by an unprivileged user."
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-08-05T11:34:13.912Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"references": [
{
"url": "https://git.kernel.org/stable/c/78e4aa528a7b1204219d808310524344f627d069"
},
{
"url": "https://git.kernel.org/stable/c/893eeba94c40d513cd0fe6539330ebdaea208c0e"
},
{
"url": "https://git.kernel.org/stable/c/454c454ed645fed051216b79622f7cb69c1638f5"
},
{
"url": "https://git.kernel.org/stable/c/5dfe2408fd7dc4d2e7ac38a116ff0a37b1cfd3b9"
},
{
"url": "https://git.kernel.org/stable/c/6cd4a78d962bebbaf8beb7d2ead3f34120e3f7b2"
}
],
"title": "net: do not leave a dangling sk pointer, when socket creation fails",
"x_generator": {
"engine": "bippy-1.2.0"
}
}
},
"cveMetadata": {
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"assignerShortName": "Linux",
"cveId": "CVE-2024-40954",
"datePublished": "2024-07-12T12:31:57.517Z",
"dateReserved": "2024-07-12T12:17:45.592Z",
"dateUpdated": "2026-08-05T11:34:13.912Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
}
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
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.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.
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