IM
IronMonkey Threat Research

CVE-2025-21653 MEDIUM

Published: 2025-01-19 | Last Modified: 2026-05-12 | Status: Modified

Description

In the Linux kernel, the following vulnerability has been resolved: net_sched: cls_flow: validate TCA_FLOW_RSHIFT attribute syzbot found that TCA_FLOW_RSHIFT attribute was not validated. Right shitfing a 32bit integer is undefined for large shift values. UBSAN: shift-out-of-bounds in net/sched/cls_flow.c:329:23 shift exponent 9445 is too large for 32-bit type 'u32' (aka 'unsigned int') CPU: 1 UID: 0 PID: 54 Comm: kworker/u8:3 Not tainted 6.13.0-rc3-syzkaller-00180-g4f619d518db9 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 Workqueue: ipv6_addrconf addrconf_dad_work Call Trace: <TASK> __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120 ubsan_epilogue lib/ubsan.c:231 [inline] __ubsan_handle_shift_out_of_bounds+0x3c8/0x420 lib/ubsan.c:468 flow_classify+0x24d5/0x25b0 net/sched/cls_flow.c:329 tc_classify include/net/tc_wrapper.h:197 [inline] __tcf_classify net/sched/cls_api.c:1771 [inline] tcf_classify+0x420/0x1160 net/sched/cls_api.c:1867 sfb_classify net/sched/sch_sfb.c:260 [inline] sfb_enqueue+0x3ad/0x18b0 net/sched/sch_sfb.c:318 dev_qdisc_enqueue+0x4b/0x290 net/core/dev.c:3793 __dev_xmit_skb net/core/dev.c:3889 [inline] __dev_queue_xmit+0xf0e/0x3f50 net/core/dev.c:4400 dev_queue_xmit include/linux/netdevice.h:3168 [inline] neigh_hh_output include/net/neighbour.h:523 [inline] neigh_output include/net/neighbour.h:537 [inline] ip_finish_output2+0xd41/0x1390 net/ipv4/ip_output.c:236 iptunnel_xmit+0x55d/0x9b0 net/ipv4/ip_tunnel_core.c:82 udp_tunnel_xmit_skb+0x262/0x3b0 net/ipv4/udp_tunnel_core.c:173 geneve_xmit_skb drivers/net/geneve.c:916 [inline] geneve_xmit+0x21dc/0x2d00 drivers/net/geneve.c:1039 __netdev_start_xmit include/linux/netdevice.h:5002 [inline] netdev_start_xmit include/linux/netdevice.h:5011 [inline] xmit_one net/core/dev.c:3590 [inline] dev_hard_start_xmit+0x27a/0x7d0 net/core/dev.c:3606 __dev_queue_xmit+0x1b73/0x3f50 net/core/dev.c:4434

Additional Descriptions (1)

En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: net_sched: cls_flow: validar el atributo TCA_FLOW_RSHIFT syzbot encontró que el atributo TCA_FLOW_RSHIFT no estaba validado. El uso de un entero de 32 bits con valores de desplazamiento grandes no está definido. UBSAN: cambio fuera de los límites en net/sched/cls_flow.c:329:23 El exponente de cambio 9445 es demasiado grande para el tipo de 32 bits 'u32' (también conocido como 'unsigned int') CPU: 1 UID: 0 PID: 54 Comm: kworker/u8:3 No contaminado 6.13.0-rc3-syzkaller-00180-g4f619d518db9 #0 Nombre del hardware: Google Google Compute Engine/Google Compute Engine, BIOS Google 13/09/2024 Cola de trabajo: ipv6_addrconf addrconf_dad_work Seguimiento de llamadas: __dump_stack lib/dump_stack.c:94 [en línea] dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120 ubsan_epilogue lib/ubsan.c:231 [en línea] __ubsan_handle_shift_out_of_bounds+0x3c8/0x420 lib/ubsan.c:468 flow_classify+0x24d5/0x25b0 net/sched/cls_flow.c:329 tc_classify include/net/tc_wrapper.h:197 [en línea] __tcf_classify net/sched/cls_api.c:1771 [en línea] tcf_classify+0x420/0x1160 net/sched/cls_api.c:1867 sfb_classify net/sched/sch_sfb.c:260 [en línea] sfb_enqueue+0x3ad/0x18b0 net/sched/sch_sfb.c:318 dev_qdisc_enqueue+0x4b/0x290 net/core/dev.c:3793 __dev_xmit_skb net/core/dev.c:3889 [en línea] __dev_queue_xmit+0xf0e/0x3f50 net/core/dev.c:4400 dev_queue_xmit include/linux/netdevice.h:3168 [en línea] neigh_hh_output include/net/neighbour.h:523 [en línea] neigh_output include/net/neighbour.h:537 [en línea] ip_finish_output2+0xd41/0x1390 net/ipv4/ip_output.c:236 iptunnel_xmit+0x55d/0x9b0 net/ipv4/ip_tunnel_core.c:82 udp_tunnel_xmit_skb+0x262/0x3b0 net/ipv4/udp_tunnel_core.c:173 geneve_xmit_skb drivers/net/geneve.c:916 [en línea] geneve_xmit+0x21dc/0x2d00 drivers/net/geneve.c:1039 __netdev_start_xmit include/linux/netdevice.h:5002 [en línea] netdev_start_xmit include/linux/netdevice.h:5011 [en línea] xmit_one net/core/dev.c:3590 [en línea] dev_hard_start_xmit+0x27a/0x7d0 net/core/dev.c:3606 __dev_queue_xmit+0x1b73/0x3f50 red/núcleo/dev.c:4434

CVSS Metrics

Base Score: 5.5 (MEDIUM)

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Attack VectorLOCAL
Attack ComplexityLOW
Privileges RequiredLOW
User InteractionNONE
ScopeUNCHANGED
Confidentiality ImpactNONE
Integrity ImpactNONE
Availability ImpactHIGH

Source: [email protected]

Type: Primary

Exploitability Score: 1.8

Impact Score: 3.6

Weaknesses

Source Type Description
[email protected] Primary
en NVD-CWE-noinfo

Affected Products

Vendor Product Version Update Type
linux linux_kernel * <built-in method update of dict object at 0x7fd370360280> Operating System
linux linux_kernel * <built-in method update of dict object at 0x7fd29874b840> Operating System
linux linux_kernel * <built-in method update of dict object at 0x7fd34b8d8d80> Operating System
linux linux_kernel * <built-in method update of dict object at 0x7fd38674cd80> Operating System
linux linux_kernel * <built-in method update of dict object at 0x7fd384a98f40> Operating System
linux linux_kernel * <built-in method update of dict object at 0x7fd384a9acc0> Operating System
linux linux_kernel 6.13 <built-in method update of dict object at 0x7fd34b8d9140> Operating System
linux linux_kernel 6.13 <built-in method update of dict object at 0x7fd340ad55c0> Operating System
linux linux_kernel 6.13 <built-in method update of dict object at 0x7fd34b8db080> Operating System
linux linux_kernel 6.13 <built-in method update of dict object at 0x7fd384a9ad00> Operating System
linux linux_kernel 6.13 <built-in method update of dict object at 0x7fd340ad73c0> Operating System
linux linux_kernel 6.13 <built-in method update of dict object at 0x7fd384a9a280> Operating System

Affected Configurations

Operator: OR

Vulnerable CPE
Yes cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
Yes cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
Yes cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
Yes cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
Yes cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
Yes cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
Yes cpe:2.3:o:linux:linux_kernel:6.13:rc1:*:*:*:*:*:*
Yes cpe:2.3:o:linux:linux_kernel:6.13:rc2:*:*:*:*:*:*
Yes cpe:2.3:o:linux:linux_kernel:6.13:rc3:*:*:*:*:*:*
Yes cpe:2.3:o:linux:linux_kernel:6.13:rc4:*:*:*:*:*:*
Yes cpe:2.3:o:linux:linux_kernel:6.13:rc5:*:*:*:*:*:*
Yes cpe:2.3:o:linux:linux_kernel:6.13:rc6:*:*:*:*:*:*

References