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EUVD-2026-317003
European Vulnerability Database identifier assigned by ENISAReserved
2026-10-02 07:37
Assigner
ENISA
Alias of
a CVE record, shown under related vulnerabilities.
This identifier carries no description, severity or references of its own:
they belong to that CVE.
{
"assigner": "ENISA",
"date_reserved": "2026-10-02T07:37:12.396450+00:00",
"id": "EUVD-2026-317003"
}
CVE-2024-37356 (GCVE-0-2024-37356)
Vulnerability from cvelistv5 – Published: 2024-06-21 10:18 – Updated: 2026-05-12 11:54
VLAI
EPSS
VEX
Title
tcp: Fix shift-out-of-bounds in dctcp_update_alpha().
Summary
In the Linux kernel, the following vulnerability has been resolved:
tcp: Fix shift-out-of-bounds in dctcp_update_alpha().
In dctcp_update_alpha(), we use a module parameter dctcp_shift_g
as follows:
alpha -= min_not_zero(alpha, alpha >> dctcp_shift_g);
...
delivered_ce <<= (10 - dctcp_shift_g);
It seems syzkaller started fuzzing module parameters and triggered
shift-out-of-bounds [0] by setting 100 to dctcp_shift_g:
memcpy((void*)0x20000080,
"/sys/module/tcp_dctcp/parameters/dctcp_shift_g\000", 47);
res = syscall(__NR_openat, /*fd=*/0xffffffffffffff9cul, /*file=*/0x20000080ul,
/*flags=*/2ul, /*mode=*/0ul);
memcpy((void*)0x20000000, "100\000", 4);
syscall(__NR_write, /*fd=*/r[0], /*val=*/0x20000000ul, /*len=*/4ul);
Let's limit the max value of dctcp_shift_g by param_set_uint_minmax().
With this patch:
# echo 10 > /sys/module/tcp_dctcp/parameters/dctcp_shift_g
# cat /sys/module/tcp_dctcp/parameters/dctcp_shift_g
10
# echo 11 > /sys/module/tcp_dctcp/parameters/dctcp_shift_g
-bash: echo: write error: Invalid argument
[0]:
UBSAN: shift-out-of-bounds in net/ipv4/tcp_dctcp.c:143:12
shift exponent 100 is too large for 32-bit type 'u32' (aka 'unsigned int')
CPU: 0 PID: 8083 Comm: syz-executor345 Not tainted 6.9.0-05151-g1b294a1f3561 #2
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS
1.13.0-1ubuntu1.1 04/01/2014
Call Trace:
<TASK>
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0x201/0x300 lib/dump_stack.c:114
ubsan_epilogue lib/ubsan.c:231 [inline]
__ubsan_handle_shift_out_of_bounds+0x346/0x3a0 lib/ubsan.c:468
dctcp_update_alpha+0x540/0x570 net/ipv4/tcp_dctcp.c:143
tcp_in_ack_event net/ipv4/tcp_input.c:3802 [inline]
tcp_ack+0x17b1/0x3bc0 net/ipv4/tcp_input.c:3948
tcp_rcv_state_process+0x57a/0x2290 net/ipv4/tcp_input.c:6711
tcp_v4_do_rcv+0x764/0xc40 net/ipv4/tcp_ipv4.c:1937
sk_backlog_rcv include/net/sock.h:1106 [inline]
__release_sock+0x20f/0x350 net/core/sock.c:2983
release_sock+0x61/0x1f0 net/core/sock.c:3549
mptcp_subflow_shutdown+0x3d0/0x620 net/mptcp/protocol.c:2907
mptcp_check_send_data_fin+0x225/0x410 net/mptcp/protocol.c:2976
__mptcp_close+0x238/0xad0 net/mptcp/protocol.c:3072
mptcp_close+0x2a/0x1a0 net/mptcp/protocol.c:3127
inet_release+0x190/0x1f0 net/ipv4/af_inet.c:437
__sock_release net/socket.c:659 [inline]
sock_close+0xc0/0x240 net/socket.c:1421
__fput+0x41b/0x890 fs/file_table.c:422
task_work_run+0x23b/0x300 kernel/task_work.c:180
exit_task_work include/linux/task_work.h:38 [inline]
do_exit+0x9c8/0x2540 kernel/exit.c:878
do_group_exit+0x201/0x2b0 kernel/exit.c:1027
__do_sys_exit_group kernel/exit.c:1038 [inline]
__se_sys_exit_group kernel/exit.c:1036 [inline]
__x64_sys_exit_group+0x3f/0x40 kernel/exit.c:1036
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xe4/0x240 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x67/0x6f
RIP: 0033:0x7f6c2b5005b6
Code: Unable to access opcode bytes at 0x7f6c2b50058c.
RSP: 002b:00007ffe883eb948 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 00007f6c2b5862f0 RCX: 00007f6c2b5005b6
RDX: 0000000000000001 RSI: 000000000000003c RDI: 0000000000000001
RBP: 0000000000000001 R08: 00000000000000e7 R09: ffffffffffffffc0
R10: 0000000000000006 R11: 0000000000000246 R12: 00007f6c2b5862f0
R13: 0000000000000001 R14: 0000000000000000 R15: 0000000000000001
</TASK>
Severity
No CVSS data available.
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2024-06-21 13:56 UTC
Assigner
References
12 references
Impacted products
9 products
| Vendor | Product | Version | |
|---|---|---|---|
| Linux | Linux |
Affected:
e3118e8359bb7c59555aca60c725106e6d78c5ce , < 06d0fe049b51b0a92a70df8333fd85c4ba3eb2c6
(git)
Affected: e3118e8359bb7c59555aca60c725106e6d78c5ce , < 6aacaa80d962f4916ccf90e2080306cec6c90fcf (git) Affected: e3118e8359bb7c59555aca60c725106e6d78c5ce , < e9b2f60636d18dfd0dd4965b3316f88dfd6a2b31 (git) Affected: e3118e8359bb7c59555aca60c725106e6d78c5ce , < 8602150286a2a860a1dc55cbd04f99316f19b40a (git) Affected: e3118e8359bb7c59555aca60c725106e6d78c5ce , < e65d13ec00a738fa7661925fd5929ab3c765d4be (git) Affected: e3118e8359bb7c59555aca60c725106e6d78c5ce , < 02261d3f9dc7d1d7be7d778f839e3404ab99034c (git) Affected: e3118e8359bb7c59555aca60c725106e6d78c5ce , < 237340dee373b97833a491d2e99fcf1d4a9adafd (git) Affected: e3118e8359bb7c59555aca60c725106e6d78c5ce , < 3ebc46ca8675de6378e3f8f40768e180bb8afa66 (git) |
|
| Linux | Linux |
Affected:
3.18
Unaffected: 0 , < 3.18 (semver) Unaffected: 4.19.316 , ≤ 4.19.* (semver) Unaffected: 5.4.278 , ≤ 5.4.* (semver) Unaffected: 5.10.219 , ≤ 5.10.* (semver) Unaffected: 5.15.161 , ≤ 5.15.* (semver) Unaffected: 6.1.93 , ≤ 6.1.* (semver) Unaffected: 6.6.33 , ≤ 6.6.* (semver) Unaffected: 6.9.4 , ≤ 6.9.* (semver) Unaffected: 6.10 , ≤ * (original_commit_for_fix) |
|
| Siemens | RUGGEDCOM RST2428P |
Affected:
0 , < V3.1
(custom)
|
|
| Siemens | SCALANCE XC-300/XR-300/XC-400/XR-500WG/XR-500 family |
Unaffected:
0 , < *
(custom)
|
|
| Siemens | SCALANCE XCM-/XRM-/XCH-/XRH-300 family |
Affected:
0 , < V3.1
(custom)
|
|
| Siemens | SIMATIC S7-1500 TM MFP - GNU/Linux subsystem |
Affected:
0 , < *
(custom)
|
|
| Siemens | SIMATIC S7-1500 CPU 1518-4 PN/DP MFP |
Affected:
V3.1.0 , < V3.1.5
(custom)
|
|
| Siemens | SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP |
Affected:
V3.1.0 , < V3.1.5
(custom)
|
|
| Siemens | SIPLUS S7-1500 CPU 1518-4 PN/DP MFP |
Affected:
V3.1.0 , < V3.1.5
(custom)
|
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\ntcp: Fix shift-out-of-bounds in dctcp_update_alpha().\n\nIn dctcp_update_alpha(), we use a module parameter dctcp_shift_g\nas follows:\n\n alpha -= min_not_zero(alpha, alpha \u003e\u003e dctcp_shift_g);\n ...\n delivered_ce \u003c\u003c= (10 - dctcp_shift_g);\n\nIt seems syzkaller started fuzzing module parameters and triggered\nshift-out-of-bounds [0] by setting 100 to dctcp_shift_g:\n\n memcpy((void*)0x20000080,\n \"/sys/module/tcp_dctcp/parameters/dctcp_shift_g\\000\", 47);\n res = syscall(__NR_openat, /*fd=*/0xffffffffffffff9cul, /*file=*/0x20000080ul,\n /*flags=*/2ul, /*mode=*/0ul);\n memcpy((void*)0x20000000, \"100\\000\", 4);\n syscall(__NR_write, /*fd=*/r[0], /*val=*/0x20000000ul, /*len=*/4ul);\n\nLet\u0027s limit the max value of dctcp_shift_g by param_set_uint_minmax().\n\nWith this patch:\n\n # echo 10 \u003e /sys/module/tcp_dctcp/parameters/dctcp_shift_g\n # cat /sys/module/tcp_dctcp/parameters/dctcp_shift_g\n 10\n # echo 11 \u003e /sys/module/tcp_dctcp/parameters/dctcp_shift_g\n -bash: echo: write error: Invalid argument\n\n[0]:\nUBSAN: shift-out-of-bounds in net/ipv4/tcp_dctcp.c:143:12\nshift exponent 100 is too large for 32-bit type \u0027u32\u0027 (aka \u0027unsigned int\u0027)\nCPU: 0 PID: 8083 Comm: syz-executor345 Not tainted 6.9.0-05151-g1b294a1f3561 #2\nHardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS\n1.13.0-1ubuntu1.1 04/01/2014\nCall Trace:\n \u003cTASK\u003e\n __dump_stack lib/dump_stack.c:88 [inline]\n dump_stack_lvl+0x201/0x300 lib/dump_stack.c:114\n ubsan_epilogue lib/ubsan.c:231 [inline]\n __ubsan_handle_shift_out_of_bounds+0x346/0x3a0 lib/ubsan.c:468\n dctcp_update_alpha+0x540/0x570 net/ipv4/tcp_dctcp.c:143\n tcp_in_ack_event net/ipv4/tcp_input.c:3802 [inline]\n tcp_ack+0x17b1/0x3bc0 net/ipv4/tcp_input.c:3948\n tcp_rcv_state_process+0x57a/0x2290 net/ipv4/tcp_input.c:6711\n tcp_v4_do_rcv+0x764/0xc40 net/ipv4/tcp_ipv4.c:1937\n sk_backlog_rcv include/net/sock.h:1106 [inline]\n __release_sock+0x20f/0x350 net/core/sock.c:2983\n release_sock+0x61/0x1f0 net/core/sock.c:3549\n mptcp_subflow_shutdown+0x3d0/0x620 net/mptcp/protocol.c:2907\n mptcp_check_send_data_fin+0x225/0x410 net/mptcp/protocol.c:2976\n __mptcp_close+0x238/0xad0 net/mptcp/protocol.c:3072\n mptcp_close+0x2a/0x1a0 net/mptcp/protocol.c:3127\n inet_release+0x190/0x1f0 net/ipv4/af_inet.c:437\n __sock_release net/socket.c:659 [inline]\n sock_close+0xc0/0x240 net/socket.c:1421\n __fput+0x41b/0x890 fs/file_table.c:422\n task_work_run+0x23b/0x300 kernel/task_work.c:180\n exit_task_work include/linux/task_work.h:38 [inline]\n do_exit+0x9c8/0x2540 kernel/exit.c:878\n do_group_exit+0x201/0x2b0 kernel/exit.c:1027\n __do_sys_exit_group kernel/exit.c:1038 [inline]\n __se_sys_exit_group kernel/exit.c:1036 [inline]\n __x64_sys_exit_group+0x3f/0x40 kernel/exit.c:1036\n do_syscall_x64 arch/x86/entry/common.c:52 [inline]\n do_syscall_64+0xe4/0x240 arch/x86/entry/common.c:83\n entry_SYSCALL_64_after_hwframe+0x67/0x6f\nRIP: 0033:0x7f6c2b5005b6\nCode: Unable to access opcode bytes at 0x7f6c2b50058c.\nRSP: 002b:00007ffe883eb948 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7\nRAX: ffffffffffffffda RBX: 00007f6c2b5862f0 RCX: 00007f6c2b5005b6\nRDX: 0000000000000001 RSI: 000000000000003c RDI: 0000000000000001\nRBP: 0000000000000001 R08: 00000000000000e7 R09: ffffffffffffffc0\nR10: 0000000000000006 R11: 0000000000000246 R12: 00007f6c2b5862f0\nR13: 0000000000000001 R14: 0000000000000000 R15: 0000000000000001\n \u003c/TASK\u003e"
}
],
"providerMetadata": {
"dateUpdated": "2026-05-11T20:18:28.367Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"references": [
{
"url": "https://git.kernel.org/stable/c/06d0fe049b51b0a92a70df8333fd85c4ba3eb2c6"
},
{
"url": "https://git.kernel.org/stable/c/6aacaa80d962f4916ccf90e2080306cec6c90fcf"
},
{
"url": "https://git.kernel.org/stable/c/e9b2f60636d18dfd0dd4965b3316f88dfd6a2b31"
},
{
"url": "https://git.kernel.org/stable/c/8602150286a2a860a1dc55cbd04f99316f19b40a"
},
{
"url": "https://git.kernel.org/stable/c/e65d13ec00a738fa7661925fd5929ab3c765d4be"
},
{
"url": "https://git.kernel.org/stable/c/02261d3f9dc7d1d7be7d778f839e3404ab99034c"
},
{
"url": "https://git.kernel.org/stable/c/237340dee373b97833a491d2e99fcf1d4a9adafd"
},
{
"url": "https://git.kernel.org/stable/c/3ebc46ca8675de6378e3f8f40768e180bb8afa66"
}
],
"title": "tcp: Fix shift-out-of-bounds in dctcp_update_alpha().",
"x_generator": {
"engine": "bippy-1.2.0"
}
}
},
"cveMetadata": {
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"assignerShortName": "Linux",
"cveId": "CVE-2024-37356",
"datePublished": "2024-06-21T10:18:11.642Z",
"dateReserved": "2024-06-21T10:13:16.306Z",
"dateUpdated": "2026-05-12T11:54:30.036Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
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Trend slope:
-
(linear fit over daily sighting counts)
Show additional events:
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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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