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CVE-2026-72117— can: bcm: fix data race on rx_stamp/rx_ifindex in bcm_rx_handler()

Quick assessment

Affected
Linux Linux
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Linux kernel是美国Linux基金会开源的一个操作系统内核。 Linux kernel存在安全漏洞，该漏洞源于bcm_rx_handler()中rx_stamp和rx_ifindex存在数据竞争问题，可能导致并发写入时发生撕裂存储，进而导致报告的时间戳和接口索引与帧内容不一致。

AI Predicted 5.5 Difficulty: Moderate EPSS 0.21% · P12

Possible ATT&CK Techniques 1 AI

T1059 · Command and Scripting Interpreter

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux ffd980f976e7fd666c2e61bf8ab35107efd11828< b64f60c468d149aca22ea56bb842b9730215aaa5 affected
ffd980f976e7fd666c2e61bf8ab35107efd11828< c8a5d7cb095d3b12bd9dcf752d6ca0ff50872ac5 affected
ffd980f976e7fd666c2e61bf8ab35107efd11828< 4b97410f4bba18d2ee2784c8e089104f387bc27c affected
ffd980f976e7fd666c2e61bf8ab35107efd11828< 5f246b96ab47523ec9b8ea870b5c567a3cb1eb1c affected
ffd980f976e7fd666c2e61bf8ab35107efd11828< 656ff69ef235699035e57d9e1ae417e62a38aa7f affected
ffd980f976e7fd666c2e61bf8ab35107efd11828< 136de17f38630307991c59aa7080012a99451783 affected
ffd980f976e7fd666c2e61bf8ab35107efd11828< c312b750bb5ac3348cfc85dab25e90937bd4d251 affected
ffd980f976e7fd666c2e61bf8ab35107efd11828< 58fd6cbc8541216af1d7ed272ea7ac2b66d50fd8 affected
… +10 more rows
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I. Basic Information for CVE-2026-72117

Vulnerability Information
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Vulnerability Title
can: bcm: fix data race on rx_stamp/rx_ifindex in bcm_rx_handler()
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: can: bcm: fix data race on rx_stamp/rx_ifindex in bcm_rx_handler() For an rx op subscribed on all interfaces (ifindex == 0), the same op is registered once in the shared per-netns wildcard filter list, so bcm_rx_handler() can run concurrently on different CPUs for frames arriving on different net devices. op->rx_stamp and op->rx_ifindex were written before bcm_rx_update_lock was taken, allowing concurrent writers to race each other - including a torn store of the 64-bit rx_stamp on 32-bit platforms. Beyond a torn store bcm_send_to_user() must report the timestamp/ifindex of the very same frame whose content it is delivering. So the assignment is placed in the same unbroken bcm_rx_update_lock section as the content comparison. As a side effect, the RTR-request frame feature (which never reach bcm_send_to_user()) no longer updates rx_stamp/rx_ifindex, since only the notification path needs them.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会开源的一个操作系统内核。 Linux kernel存在安全漏洞，该漏洞源于bcm_rx_handler()中rx_stamp和rx_ifindex存在数据竞争问题，可能导致并发写入时发生撕裂存储，进而导致报告的时间戳和接口索引与帧内容不一致。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux ffd980f976e7fd666c2e61bf8ab35107efd11828 ~ b64f60c468d149aca22ea56bb842b9730215aaa5 -
Linux Linux 2.6.25 -

II. Public POCs for CVE-2026-72117

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III. Intelligence Information for CVE-2026-72117

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Patches & Fixes for CVE-2026-72117 (8)

Same Patch Batch · Linux · 2026-08-15 · 845 CVEs total

CVE-2026-74475 10.0 CRITICAL vxlan: use neigh_ha_snapshot() in route_shortcircuit()
CVE-2026-74280 10.0 CRITICAL crypto: marvell/octeontx - fix DMA cleanup using wrong loop index
CVE-2026-74279 10.0 CRITICAL crypto: cavium/cpt - fix DMA cleanup using wrong loop index
CVE-2026-72408 10.0 CRITICAL geneve: gate GRO hint in geneve_gro_complete() on gs->gro_hint
CVE-2026-74309 10.0 CRITICAL vdpa/octeon_ep: fix IRQ-to-ring mapping in interrupt handler
CVE-2026-72421 10.0 CRITICAL ipv4: fib: Don't ignore error route in local/main tables.
CVE-2026-72407 10.0 CRITICAL geneve: validate inner network offset in geneve_gro_complete()
CVE-2026-72493 9.9 CRITICAL net: serialize netif_running() check in enqueue_to_backlog()
CVE-2026-72065 9.8 CRITICAL net: mana: Validate the packet length reported by the NIC
CVE-2026-74361 9.8 CRITICAL nvme: fix FDP fdpcidx bounds check
CVE-2026-72064 9.8 CRITICAL net: mana: Sync page pool RX frags for CPU
CVE-2026-74480 9.8 CRITICAL net: bridge: stop fast-leave after deleting a port group
CVE-2026-72191 9.8 CRITICAL ntfs3: validate split-point offset in indx_insert_into_buffer
CVE-2026-72192 9.8 CRITICAL ntfs3: bound to_move in indx_insert_into_root before hdr_insert_head
CVE-2026-74478 9.8 CRITICAL um: vector: fix use-after-free in vector_mmsg_rx()
CVE-2026-72194 9.8 CRITICAL fs/ntfs3: add depth limit to indx_find_buffer to prevent stack overflow
CVE-2026-74269 9.8 CRITICAL bnxt: fix head underflow on XDP head-grow
CVE-2026-72209 9.8 CRITICAL ntfs: validate attribute values on lookup
CVE-2026-72211 9.8 CRITICAL ntfs: grow index root value before reparent header update
CVE-2026-72041 9.8 CRITICAL espintcp: use sk_msg_free_partial to fix partial send

Showing top 20 of 845 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-72117

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