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CVE-2026-72122— can: bcm: fix lockless bound/ifindex race and silent RX_SETUP failure

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can: bcm模块中的bcm_sendmsg()在获取锁前无锁读取bo->ifindex和bo->bound，与bcm_notify()、bcm_connect()等函数存在竞争条件，可能导致套接字绑定状态不一致，使原本绑定特定CAN接口的套接字变为匹配任意接口，并导致bcm_rx_setup()在目标设备并发消失时静默返回成功。

CVSS 7.3 · High EPSS 0.16% · P5

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux ffd980f976e7fd666c2e61bf8ab35107efd11828< 9e60c586faeaed80d55ab8ce2a4b8e56133bc395 affected
ffd980f976e7fd666c2e61bf8ab35107efd11828< ffa80a2af27c97453861a5128e537214a31cd18a affected
ffd980f976e7fd666c2e61bf8ab35107efd11828< 6bcc5cd247c2934373bc2a1cdf8bf12321169543 affected
ffd980f976e7fd666c2e61bf8ab35107efd11828< 0f6f9f95294b4cbb26ba02209e893e3bd91237c3 affected
ffd980f976e7fd666c2e61bf8ab35107efd11828< b70f1a15533afeeec5d07f20bec3f3867ab1c7b6 affected
ffd980f976e7fd666c2e61bf8ab35107efd11828< 35f0ac19efb1a3f6c5e12c00e475a9ec2d9c3a6d affected
ffd980f976e7fd666c2e61bf8ab35107efd11828< b9c6ac6fb4e01b34575816066e5d3890a57b3c86 affected
ffd980f976e7fd666c2e61bf8ab35107efd11828< d9b091d9d22fee81ec53fb55d2032951993ceadb affected
… +10 more rows
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I. Basic Information for CVE-2026-72122

Vulnerability Information
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Vulnerability Title
can: bcm: fix lockless bound/ifindex race and silent RX_SETUP failure
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: can: bcm: fix lockless bound/ifindex race and silent RX_SETUP failure bcm_sendmsg() reads bo->ifindex and checks bo->bound before taking lock_sock(), while bcm_notify(), bcm_connect() and bcm_release() all mutate both fields under that same lock. Because the lockless reads and the locked writes are unordered with respect to each other, a racing bcm_notify() (device unregister) or bcm_connect() (concurrent bind on another thread sharing the socket) can make bcm_sendmsg() observe an inconsistent combination, e.g. a stale bound=1 together with the now-cleared ifindex=0, silently turning a socket bound to a specific CAN interface into one that also matches "any" interface. Keep the lockless bo->bound check purely as a fast-path reject, and move the ifindex read (and a bo->bound re-check) into the locked section, where every writer already serializes. This removes the possibility of observing the two fields torn against each other, rather than trying to fix it with more READ_ONCE()/WRITE_ONCE() pairs on two independently updated fields. Annotate the now-purely-lockless bo->bound accesses consistently across all its write sites. Also fix bcm_rx_setup() silently returning success when the target device disappears concurrently instead of reporting -ENODEV, so a broken RX op is no longer left registered as if it had succeeded.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:L
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can: bcm模块中的bcm_sendmsg()在获取锁前无锁读取bo->ifindex和bo->bound，与bcm_notify()、bcm_connect()等函数存在竞争条件，可能导致套接字绑定状态不一致，使原本绑定特定CAN接口的套接字变为匹配任意接口，并导致bcm_rx_setup()在目标设备并发消失时静默返回成功。
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 ~ 9e60c586faeaed80d55ab8ce2a4b8e56133bc395 -
Linux Linux 2.6.25 -

II. Public POCs for CVE-2026-72122

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III. Intelligence Information for CVE-2026-72122

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Patches & Fixes for CVE-2026-72122 (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-2026-72407 10.0 CRITICAL geneve: validate inner network offset in geneve_gro_complete()
CVE-2026-72408 10.0 CRITICAL geneve: gate GRO hint in geneve_gro_complete() on gs->gro_hint
CVE-2026-72421 10.0 CRITICAL ipv4: fib: Don't ignore error route in local/main tables.
CVE-2026-74309 10.0 CRITICAL vdpa/octeon_ep: fix IRQ-to-ring mapping in interrupt handler
CVE-2026-74279 10.0 CRITICAL crypto: cavium/cpt - fix DMA cleanup using wrong loop index
CVE-2026-72493 9.9 CRITICAL net: serialize netif_running() check in enqueue_to_backlog()
CVE-2026-72381 9.8 CRITICAL ksmbd: fix use-after-free of fp->owner.name in durable handle owner check
CVE-2026-72393 9.8 CRITICAL eth: fbnic: don't cache shinfo across skb realloc
CVE-2026-74401 9.8 CRITICAL dlm: fix add msg handle in send_queue ordered
CVE-2026-74406 9.8 CRITICAL vxlan: Fix potential null-ptr-deref in vxlan_gro_prepare_receive().
CVE-2026-72355 9.8 CRITICAL netfs: Fix barriering when walking subrequest list
CVE-2026-72339 9.8 CRITICAL qede: fix off-by-one in BD ring consumption on build_skb failure
CVE-2026-72211 9.8 CRITICAL ntfs: grow index root value before reparent header update
CVE-2026-72194 9.8 CRITICAL fs/ntfs3: add depth limit to indx_find_buffer to prevent stack overflow
CVE-2026-72351 9.8 CRITICAL gue: validate REMCSUM private option length
CVE-2026-72366 9.8 CRITICAL netfs: Fix netfs_create_write_req() to handle async cache object creation
CVE-2026-72098 9.8 CRITICAL dm-verity: fix buffer overflow in FEC calculation
CVE-2026-72083 9.8 CRITICAL scsi: target: core: Fix iSCSI ISID use-after-free in REGISTER AND MOVE

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

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

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