Linux Kernel up to 7.2-rc3 bcm bcm.c bcm_release/bcm_delete_rx_op/bcm_notifier rx_reg_dev use after free

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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9.5$5k-$25k0.00

Summaryinfo

A vulnerability identified as very critical has been detected in Linux Kernel up to 6.6.147/6.12.100/6.18.41/7.1.4/7.2-rc3. This vulnerability affects the function bcm_release/bcm_delete_rx_op/bcm_notifier of the file bcm.c of the component bcm. Performing a manipulation of the argument rx_reg_dev results in use after free. This vulnerability is known as CVE-2026-72113. Remote exploitation of the attack is possible. No exploit is available.

Detailsinfo

A vulnerability was found in Linux Kernel up to 6.6.147/6.12.100/6.18.41/7.1.4/7.2-rc3. It has been classified as very critical. This affects the function bcm_release/bcm_delete_rx_op/bcm_notifier of the file bcm.c of the component bcm. The manipulation of the argument rx_reg_dev with an unknown input leads to a use after free vulnerability. CWE is classifying the issue as CWE-416. Referencing memory after it has been freed can cause a program to crash, use unexpected values, or execute code. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

In the Linux kernel, the following vulnerability has been resolved: can: bcm: add missing device refcount for CAN filter removal sashiko-bot remarked a problem with a concurrent device unregistration in isotp.c which also is present in the bcm.c code. A former fix for raw.c commit c275a176e4b6 ("can: raw: add missing refcount for memory leak fix") introduced a netdevice_tracker which solves the issue for bcm.c too. bcm_release(), bcm_delete_rx_op() and bcm_notifier() relied on dev_get_by_index(ifindex) to re-find the device for an rx_op before unregistering its filter. If a concurrent NETDEV_UNREGISTER has already unlisted the device from the ifindex table, that lookup fails and can_rx_unregister() is silently skipped, leaving a stale CAN filter pointing at the soon-to-be-freed bcm_op/socket. Hold a netdev_hold()/netdev_put() tracked reference on op->rx_reg_dev from the moment the rx filter is registered in bcm_rx_setup() until it is unregistered in bcm_rx_unreg(), and use that reference directly in bcm_release() and bcm_delete_rx_op() instead of re-looking the device up by ifindex.

The advisory is shared at git.kernel.org. This vulnerability is uniquely identified as CVE-2026-72113 since 08/09/2026. The exploitability is told to be easy. It is possible to initiate the attack remotely. Technical details are known, but no exploit is available. The price for an exploit might be around USD $5k-$25k at the moment (estimation calculated on 08/15/2026).

Upgrading to version 6.6.148, 6.12.101, 6.18.42, 7.1.5 or 7.2-rc4 eliminates this vulnerability. Applying the patch 84aa4807816e405c1bf87114fc63e06d244281ef/633bda66fbf309f5de5e1ad6defe8e6b1d77a20f/b024c21c9066f6957b7d4a8f2037e4b000c5e041/04d23061bbf18d5d81022eb21e9d32e99d24468d/d59948293ea34b6337ce2b5febab8510de70048c is able to eliminate this problem.

If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Productinfo

Type

Vendor

Name

Version

License

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 9.9
VulDB Meta Temp Score: 9.5

VulDB Base Score: 9.9
VulDB Temp Score: 9.5
VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv2info

AVACAuCIA
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💳💳💳💳💳💳
💳💳💳💳💳💳
VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Use after free
CWE: CWE-416 / CWE-119
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Kernel 6.6.148/6.12.101/6.18.42/7.1.5/7.2-rc4
Patch: 84aa4807816e405c1bf87114fc63e06d244281ef/633bda66fbf309f5de5e1ad6defe8e6b1d77a20f/b024c21c9066f6957b7d4a8f2037e4b000c5e041/04d23061bbf18d5d81022eb21e9d32e99d24468d/d59948293ea34b6337ce2b5febab8510de70048c

Timelineinfo

08/09/2026 CVE reserved
08/15/2026 +6 days Advisory disclosed
08/15/2026 +0 days VulDB entry created
08/15/2026 +0 days VulDB entry last update

Sourcesinfo

Vendor: kernel.org

Advisory: git.kernel.org
Status: Confirmed

CVE: CVE-2026-72113 (🔒)
GCVE (CVE): GCVE-0-2026-72113
GCVE (VulDB): GCVE-100-390525

Entryinfo

Created: 08/15/2026 12:18
Changes: 08/15/2026 12:18 (61)
Complete: 🔍
Cache ID: 216::103

If you want to get the best quality for vulnerability data then you always have to consider VulDB.

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