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CVE Record

CVE-2026-23175: net: cpsw: Execute ndo_set_rx_mode callback in a work queue

In the Linux kernel, the following vulnerability has been resolved: net: cpsw: Execute ndo_set_rx_mode callback in a work queue Commit 1767bb2d47b7 ("ipv6: mcast: Don't hold RTNL for IPV6_ADD_MEMBERSHIP and MCAST_JOIN_GROUP.") removed the RTNL lock for IPV6_ADD_MEMBERSHIP and MCAST_JOIN_GROUP operations. However, this change triggered the following call trace on my BeagleBone Black board: WARNING: net/8021q/vlan_core.c:236 at vlan_for_each+0x120/0x124, CPU#0: rpcbind/481 RTNL: assertion failed at net/8021q/vlan_core.c (236) Modules linked in: CPU: 0 UID: 997 PID: 481 Comm: rpcbind Not tainted 6.19.0-rc7-next-20260130-yocto-standard+ #35 PREEMPT Hardware name: Generic AM33XX (Flattened Device Tree) Call trace: unwind_backtrace from show_stack+0x28/0x2c show_stack from dump_stack_lvl+0x30/0x38 dump_stack_lvl from __warn+0xb8/0x11c __warn from warn_slowpath_fmt+0x130/0x194 warn_slowpath_fmt from vlan_for_each+0x120/0x124 vlan_for_each from cpsw_add_mc_addr+0x54/0x98 cpsw_add_mc_addr from __hw_addr_ref_sync_dev+0xc4/0xec __hw_addr_ref_sync_dev from __dev_mc_add+0x78/0x88 __dev_mc_add from igmp6_group_added+0x84/0xec igmp6_group_added from __ipv6_dev_mc_inc+0x1fc/0x2f0 __ipv6_dev_mc_inc from __ipv6_sock_mc_join+0x124/0x1b4 __ipv6_sock_mc_join from do_ipv6_setsockopt+0x84c/0x1168 do_ipv6_setsockopt from ipv6_setsockopt+0x88/0xc8 ipv6_setsockopt from do_sock_setsockopt+0xe8/0x19c do_sock_setsockopt from __sys_setsockopt+0x84/0xac __sys_setsockopt from ret_fast_syscall+0x0/0x54 This trace occurs because vlan_for_each() is called within cpsw_ndo_set_rx_mode(), which expects the RTNL lock to be held. Since modifying vlan_for_each() to operate without the RTNL lock is not straightforward, and because ndo_set_rx_mode() is invoked both with and without the RTNL lock across different code paths, simply adding rtnl_lock() in cpsw_ndo_set_rx_mode() is not a viable solution. To resolve this issue, we opt to execute the actual processing within a work queue, following the approach used by the icssg-prueth driver. Please note: To reproduce this issue, I manually reverted the changes to am335x-bone-common.dtsi from commit c477358e66a3 ("ARM: dts: am335x-bone: switch to new cpsw switch drv") in order to revert to the legacy cpsw driver.

HighCVSS 7Not KEV-listedUpdated
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Glexia's TakeAutomated analysishigh

Security readout for executives and security teams

Plain-English summary

This Linux kernel issue affects CPSW networking code used by some embedded platforms. A local low-privileged user can trigger an unsafe receive-mode path after IPv6 multicast changes, potentially causing serious confidentiality, integrity, and availability impact. No active exploitation is reported in the provided sources.

Executive priority

Treat as high priority for embedded Linux fleets and appliance products using CPSW networking. It is not internet-facing by itself, but local compromise impact is broad and patch validation may require device-specific kernel review.

Technical view

The legacy cpsw driver calls vlan_for_each() from cpsw_ndo_set_rx_mode() without the RTNL lock after IPv6 multicast operations stopped holding RTNL. The kernel fix moves the processing into a work queue, matching another driver pattern. CVSS is 7.0, local, high complexity, low privilege.

Likely exposure

Exposure appears concentrated in Linux systems using affected 6.17 through 6.19-era kernels with the legacy CPSW driver, especially TI AM335x or BeagleBone-class embedded devices. General servers without this driver path are less likely exposed.

Exploitation context

The CVE is local-only and high-complexity with low privileges required. The source describes a reproducible warning path during IPv6 multicast group joins, not a public exploit. CISA KEV status is false in the bundle.

Researcher notes

Evidence is limited to the CVE record and kernel stable references. The described trigger involves IPv6 multicast membership operations reaching cpsw_ndo_set_rx_mode without RTNL. The bundle does not provide exploit code, weaponized details, or non-kernel mitigations.

Mitigation direction

  • Update to a kernel containing the referenced stable fixes or vendor backport.
  • Prioritize embedded Linux devices using TI CPSW or legacy cpsw networking.
  • Track Linux distribution and device-vendor advisories for patched package versions.
  • Limit untrusted local user access on affected devices until patched.

Validation and detection

  • Inventory kernels in the affected 6.17 through 6.19 range.
  • Identify devices using the legacy cpsw driver or TI AM335x CPSW hardware.
  • Confirm the referenced stable commits or vendor-equivalent patches are present.
  • Review logs for RTNL assertion warnings involving vlan_for_each or cpsw_ndo_set_rx_mode.
Prepared
Confidence
medium
Sources
4

Public sources used

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

Conservative CVE-to-ATT&CK context

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CVE-2026-23175 mapping review

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Vulnerability profileCVE Program record
Severity
High
CVSS
7 (3.1)
Known Exploited
No
Published

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

Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

1CVSS vectors
3Timeline events
0ADP providers
3Source links

CVSS vector scores

1 official score

We collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.

ScoreVersionSeverityVectorExploitImpactSource
7CVSS 3.1HighCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H15.9Linux

Vulnerability scoring details

Base CVSS 3.1 score

7High
CVSS 3.1 vector shape for CVE-2026-23175Attack VectorAttack ComplexityPrivileges RequiredUser InteractionScopeConfidentiality ImpactIntegrity ImpactAvailability Impact

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

Attack Vector
NetworkAdjacentLocalPhysical
Attack Complexity
LowHigh
Privileges Required
NoneLowHigh
User Interaction
NoneRequired
Scope
ChangedUnchanged
Confidentiality Impact
HighLowNone
Integrity Impact
HighLowNone
Availability Impact
HighLowNone

Vulnerability timeline

Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.

  1. CVE reservedCVE Program

    The CVE ID was reserved by the assigning CNA.

  2. CVE publishedCVE Program

    The CVE record was published.

  3. CVE updatedCVE Program

    The CVE record metadata indicates this as the latest update time.

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
LinuxLinux1767bb2d47b715a106287a8f963d9ec6cbab4e69, 1767bb2d47b715a106287a8f963d9ec6cbab4e69unaffected
LinuxLinux6.17, 0, 6.18.10, 6.19affected
Weakness

CWE details

No CWE listed

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