# CVE-2026-68336: bonding: fix devconf_all NULL dereference when IPv6 is disabled

Status: published. Published: 2026-08-10. Updated: 2026-11-06.

In the Linux kernel, the following vulnerability has been resolved:

bonding: fix devconf_all NULL dereference when IPv6 is disabled

When booting with the 'ipv6.disable=1' parameter, the devconf_all is
never initialized because inet6_init() exits before addrconf_init() is
called which initializes it. bond_send_validate(), however, will still
call bond_ns_send_all() even ipv6 is indeed disabled. It will lead to
NULL derefence of net->ipv6.devconf_all in ip6_pol_route().

 BUG: kernel NULL pointer dereference, address: 000000000000000c
 [...]
 Workqueue: bond0 bond_arp_monitor [bonding]
 RIP: 0010:ip6_pol_route+0x69/0x480
 [...]
 Call Trace:
  <TASK>
  ? srso_return_thunk+0x5/0x5f
  ? __pfx_ip6_pol_route_output+0x10/0x10
  fib6_rule_lookup+0xfe/0x260
  ? wakeup_preempt+0x8a/0x90
  ? srso_return_thunk+0x5/0x5f
  ? srso_return_thunk+0x5/0x5f
  ? sched_balance_rq+0x369/0x810
  ip6_route_output_flags+0xd7/0x170
  bond_ns_send_all+0xde/0x280 [bonding]
  bond_ab_arp_probe+0x296/0x320 [bonding]
  ? srso_return_thunk+0x5/0x5f
  bond_activebackup_arp_mon+0xb4/0x2c0 [bonding]
  process_one_work+0x196/0x370
  worker_thread+0x1af/0x320
  ? srso_return_thunk+0x5/0x5f
  ? __pfx_worker_thread+0x10/0x10
  kthread+0xe3/0x120
  ? __pfx_kthread+0x10/0x10
  ret_from_fork+0x199/0x260
  ? __pfx_kthread+0x10/0x10
  ret_from_fork_asm+0x1a/0x30
  </TASK>

Fix this by adding ipv6_mod_enabled() condition check in the caller.

## Remediation

No remediation reported in collected sources

## Affected products and versions

- Linux / Linux: ≥ 4e24be018eb9dbcefa4b01c07e298b147dc1a4d7; < 451c2d5422a309393aa8ae161fc1a527c2f19ab2 (affected, git); ≥ 4e24be018eb9dbcefa4b01c07e298b147dc1a4d7; < 2a4bad24ac5296b262ad821aa5e08bb265e6b154 (affected, git); ≥ 4e24be018eb9dbcefa4b01c07e298b147dc1a4d7; < 690ce66782778e8c4b1fdd79c0b0890a100e9522 (affected, git); ≥ 4e24be018eb9dbcefa4b01c07e298b147dc1a4d7; < 992dce02bdabbd9883255ea9b36494e34a7821d7 (affected, git); ≥ 4e24be018eb9dbcefa4b01c07e298b147dc1a4d7; < 738039ad21e20ca2c5bbde2f5a4f5ad5fb718038 (affected, git); ≥ 4e24be018eb9dbcefa4b01c07e298b147dc1a4d7; < 1c975de3343cdef506f2eecc833cc1f14b0401c4 (affected, git). Source: CNA: Linux
- Linux / Linux: 5.18 (affected); ≥ 0; < 5.18 (unaffected, semver); ≥ 6.1.183; ≤ 6.1.* (unaffected, semver); ≥ 6.6.148; ≤ 6.6.* (unaffected, semver); ≥ 6.12.101; ≤ 6.12.* (unaffected, semver); ≥ 6.18.42; ≤ 6.18.* (unaffected, semver); ≥ 7.1.6; ≤ 7.1.* (unaffected, semver); ≥ 7.2; ≤ * (unaffected, original_commit_for_fix). Source: CNA: Linux

## Severity and prioritization

- CISA KEV: No listing in collected sources

- EPSS: 0.18% as of 2026-11-06; percentile 7.66%

- SSVC: exploitation none; automatable no; technical impact partial; source ADP: CISA-ADP

- Weaknesses: Not reported

## Exploit evidence

No exploit evidence in collected sources. This is not proof of no exploitation.

## References

- https://git.kernel.org/stable/c/451c2d5422a309393aa8ae161fc1a527c2f19ab2 (CNA: Linux)

- https://git.kernel.org/stable/c/2a4bad24ac5296b262ad821aa5e08bb265e6b154 (CNA: Linux)

- https://git.kernel.org/stable/c/690ce66782778e8c4b1fdd79c0b0890a100e9522 (CNA: Linux)

- https://git.kernel.org/stable/c/992dce02bdabbd9883255ea9b36494e34a7821d7 (CNA: Linux)

- https://git.kernel.org/stable/c/738039ad21e20ca2c5bbde2f5a4f5ad5fb718038 (CNA: Linux)

- https://git.kernel.org/stable/c/1c975de3343cdef506f2eecc833cc1f14b0401c4 (CNA: Linux)

- https://git.kernel.org/stable/c/1c975de3343cdef506f2eecc833cc1f14b0401c4 (416baaa9-dc9f-4396-8d5f-8c081fb06d67)

- https://git.kernel.org/stable/c/2a4bad24ac5296b262ad821aa5e08bb265e6b154 (416baaa9-dc9f-4396-8d5f-8c081fb06d67)

- https://git.kernel.org/stable/c/451c2d5422a309393aa8ae161fc1a527c2f19ab2 (416baaa9-dc9f-4396-8d5f-8c081fb06d67)

- https://git.kernel.org/stable/c/690ce66782778e8c4b1fdd79c0b0890a100e9522 (416baaa9-dc9f-4396-8d5f-8c081fb06d67)

- https://git.kernel.org/stable/c/738039ad21e20ca2c5bbde2f5a4f5ad5fb718038 (416baaa9-dc9f-4396-8d5f-8c081fb06d67)

- https://git.kernel.org/stable/c/992dce02bdabbd9883255ea9b36494e34a7821d7 (416baaa9-dc9f-4396-8d5f-8c081fb06d67)

## Provenance

- CNA: Linux: https://www.cve.org/CVERecord?id=CVE-2026-68336; retrieved 2026-11-06; source updated 2026-11-06

- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-68336; retrieved 2026-11-06; source updated 2026-11-06

- FIRST EPSS: https://api.first.org/data/v1/epss?cve=CVE-2026-68336; retrieved 2026-11-06; source updated Not reported

Revision: 4fdb58d31728cf2de185baa2b410430529af46f0e0905989249976fd6b5de671

Canonical: https://y2.dev/cve/CVE-2026-68336

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