CVE-2024-37356 (GCVE-0-2024-37356)

Vulnerability from cvelistv5 – Published: 2024-06-21 10:18 – Updated: 2025-11-04 17:21
VLAI?
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.
Assigner
References
Impacted 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)
Create a notification for this product.
    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)
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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"
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    "nvd": "{\"cve\":{\"id\":\"CVE-2024-37356\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2024-06-21T11:15:10.677\",\"lastModified\":\"2025-11-04T18:16:25.340\",\"vulnStatus\":\"Modified\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"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\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: tcp: corrige el desplazamiento fuera de los l\u00edmites en dctcp_update_alpha(). En dctcp_update_alpha(), utilizamos un par\u00e1metro de m\u00f3dulo dctcp_shift_g de la siguiente manera: alpha -= min_not_zero(alpha, alpha \u0026gt;\u0026gt; dctcp_shift_g); ... entregado_ce \u0026lt;\u0026lt;= (10 - dctcp_shift_g); Parece que syzkaller comenz\u00f3 a modificar los par\u00e1metros del m\u00f3dulo y activ\u00f3 el desplazamiento fuera de los l\u00edmites [0] estableciendo 100 en 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); Limitemos el valor m\u00e1ximo de dctcp_shift_g mediante param_set_uint_minmax(). Con este parche: # echo 10 \u0026gt; /sys/module/tcp_dctcp/parameters/dctcp_shift_g # cat /sys/module/tcp_dctcp/parameters/dctcp_shift_g 10 # echo 11 \u0026gt; /sys/module/tcp_dctcp/parameters/dctcp_shift_g -bash: echo: error de escritura: argumento no v\u00e1lido [0]: UBSAN: desplazamiento fuera de los l\u00edmites en net/ipv4/tcp_dctcp.c:143:12 el exponente de desplazamiento 100 es demasiado grande para el tipo \u0027u32\u0027 de 32 bits (tambi\u00e9n conocido como \u0027int sin signo\u0027 ) CPU: 0 PID: 8083 Comm: syz-executor345 No contaminado 6.9.0-05151-g1b294a1f3561 #2 Nombre del hardware: PC est\u00e1ndar QEMU (i440FX + PIIX, 1996), BIOS 1.13.0-1ubuntu1.1 01/04/2014 Seguimiento de llamadas:  __dump_stack lib/dump_stack.c:88 [en l\u00ednea] dump_stack_lvl+0x201/0x300 lib/dump_stack.c:114 ubsan_epilogue lib/ubsan.c:231 [en l\u00ednea] __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 [en l\u00ednea] tcp_ack+0x17b1/0x3bc0 net/ipv4/tcp_input.c:3948 v_state_process+0x57a/0x2290 neto/ 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 [en l\u00ednea] __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+0x238/0x ad0 net/mptcp/protocolo .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 [en l\u00ednea] 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 [en l\u00ednea] 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 [en l\u00ednea] __se_sys_exit_group kernel/exit.c:1036 [en l\u00ednea] __x64_sys_exit_group+0x3f/0x40 kernel/exit.c:10 36 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 C\u00f3digo: no se puede acceder a los bytes del c\u00f3digo de operaci\u00f3n en 0x7f6c2b50058c . RSP: 002b:00007ffe883eb948 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 RAX: ffffffffffffffda RBX: 00007f6c2b5862f0 RCX: 00007f6c2b5005b6 RDX: 0000000001 RSI: 000000000000003c RDI: 0000000000000001 RBP: 0000000000000001 R08: 00000000000000e7 R09: ffffffffffffffc0 R10: 06 R11: 0000000000000246 R12: 00007f6c2b5862f0 R13: 0000000000000001 R14: 0000000000000000 R15: 0000000000000001 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\"lessThanOrEqual\": \"4.19.*\"}, {\"status\": \"unaffected\", \"version\": \"5.4.278\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.4.*\"}, {\"status\": \"unaffected\", \"version\": \"5.10.219\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.10.*\"}, {\"status\": \"unaffected\", \"version\": \"5.15.161\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.15.*\"}, {\"status\": \"unaffected\", \"version\": \"6.1.93\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.1.*\"}, {\"status\": \"unaffected\", \"version\": \"6.6.33\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.6.*\"}, {\"status\": \"unaffected\", \"version\": \"6.9.4\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.9.*\"}, {\"status\": \"unaffected\", \"version\": \"6.10\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"net/ipv4/tcp_dctcp.c\"], \"defaultStatus\": \"affected\"}], \"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\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"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\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"4.19.316\", \"versionStartIncluding\": \"3.18\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.4.278\", \"versionStartIncluding\": \"3.18\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.219\", \"versionStartIncluding\": \"3.18\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.161\", \"versionStartIncluding\": \"3.18\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.93\", \"versionStartIncluding\": \"3.18\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6.33\", \"versionStartIncluding\": \"3.18\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.9.4\", \"versionStartIncluding\": \"3.18\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.10\", \"versionStartIncluding\": \"3.18\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2025-05-04T09:13:22.548Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2024-37356\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2025-11-04T17:21:20.246Z\", \"dateReserved\": \"2024-06-21T10:13:16.306Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-06-21T10:18:11.642Z\", \"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.