CVE-2026-74398
ipv6: addrconf: bail out of dad_failure when state is no longer POSTDAD
Description
In the Linux kernel, the following vulnerability has been resolved: ipv6: addrconf: bail out of dad_failure when state is no longer POSTDAD addrconf_dad_failure() transitions ifp->state from DAD to POSTDAD via addrconf_dad_end(), which drops ifp->lock on return. The lock is re-acquired after net_info_ratelimited(). A concurrent ipv6_del_addr() can take the lock in that window, set ifp->state to DEAD and run list_del_rcu(&ifp->if_list). addrconf_dad_failure() then overwrites DEAD with ERRDAD at errdad: and schedules a new dad_work. The work calls ipv6_del_addr() again, hitting the already-poisoned list entry: general protection fault: 0000 [#1] SMP NOPTI CPU: 4 PID: 217 Comm: kworker/4:1 Workqueue: ipv6_addrconf addrconf_dad_work RIP: 0010:ipv6_del_addr+0xe9/0x280 RAX: dead000000000122 Call Trace: addrconf_dad_stop+0x113/0x140 addrconf_dad_work+0x28c/0x430 process_one_work+0x1eb/0x3b0 worker_thread+0x4d/0x400 kthread+0x104/0x140 ret_from_fork+0x35/0x40 Fold the addrconf_dad_end() logic into addrconf_dad_failure() under a single ifp->lock critical section. The STABLE_PRIVACY branch temporarily drops ifp->lock around address regeneration, so at lock_errdad: verify the state is still POSTDAD before transitioning to ERRDAD; bail out otherwise to avoid overwriting a state set by another path while the lock was released.
INFO
Published Date :
Aug. 15, 2026, 6:22 a.m.
Last Modified :
Aug. 15, 2026, 6:22 a.m.
Remotely Exploit :
No
Source :
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Affected Products
The following products are affected by CVE-2026-74398
vulnerability.
Even if cvefeed.io is aware of the exact versions of the
products
that
are
affected, the information is not represented in the table below.
No affected product recoded yet
Solution
- Fold addrconf_dad_end logic into addrconf_dad_failure.
- Verify state is POSTDAD before transitioning to ERRDAD.
- Bail out if state changed while lock was released.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-74398.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-74398 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-74398
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-74398 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-74398 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
New CVE Received by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Aug. 15, 2026
Action Type Old Value New Value Added Affected [{'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': 'c15b1ccadb323ea50023e8f1cca2954129a62b51', 'lessThan': '47b05836705b63dab93d9ac7c69a3a507375ef80', 'versionType': 'git'}, {'status': 'affected', 'version': 'c15b1ccadb323ea50023e8f1cca2954129a62b51', 'lessThan': 'd21be7d051012c6b572fa4e3334443c250216f7b', 'versionType': 'git'}, {'status': 'affected', 'version': 'c15b1ccadb323ea50023e8f1cca2954129a62b51', 'lessThan': '875c284c0f98b042bb97abad460f63a24c977f88', 'versionType': 'git'}, {'status': 'affected', 'version': 'c15b1ccadb323ea50023e8f1cca2954129a62b51', 'lessThan': '8ed0ce9ea58d677d1bac92614ee5f60f8ea57363', 'versionType': 'git'}, {'status': 'affected', 'version': 'c15b1ccadb323ea50023e8f1cca2954129a62b51', 'lessThan': '3bdc86d89fd6c6523753fa6f42fcfaf30ee699cb', 'versionType': 'git'}, {'status': 'affected', 'version': 'c15b1ccadb323ea50023e8f1cca2954129a62b51', 'lessThan': 'b61af0268e3d1308c466bf0be5dced844eafc1ef', 'versionType': 'git'}, {'status': 'affected', 'version': 'c15b1ccadb323ea50023e8f1cca2954129a62b51', 'lessThan': 'e889aa99ad3ed48bb0ddcff6475b17542532d18b', 'versionType': 'git'}, {'status': 'affected', 'version': 'c15b1ccadb323ea50023e8f1cca2954129a62b51', 'lessThan': '627ac78f2741e2ebd2225e2e953b6964a8a9182f', 'versionType': 'git'}, {'status': 'affected', 'version': '835b474b8f70fa68d68abffad37378e92f661802', 'versionType': 'git'}, {'status': 'affected', 'version': '3.10.105', 'lessThan': '3.11', 'versionType': 'semver'}], 'programFiles': ['net/ipv6/addrconf.c'], 'defaultStatus': 'unaffected'}, {'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '3.14'}, {'status': 'unaffected', 'version': '0', 'lessThan': '3.14', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '5.10.261', 'versionType': 'semver', 'lessThanOrEqual': '5.10.*'}, {'status': 'unaffected', 'version': '5.15.212', 'versionType': 'semver', 'lessThanOrEqual': '5.15.*'}, {'status': 'unaffected', 'version': '6.1.178', 'versionType': 'semver', 'lessThanOrEqual': '6.1.*'}, {'status': 'unaffected', 'version': '6.6.145', 'versionType': 'semver', 'lessThanOrEqual': '6.6.*'}, {'status': 'unaffected', 'version': '6.12.97', 'versionType': 'semver', 'lessThanOrEqual': '6.12.*'}, {'status': 'unaffected', 'version': '6.18.40', 'versionType': 'semver', 'lessThanOrEqual': '6.18.*'}, {'status': 'unaffected', 'version': '7.1.5', 'versionType': 'semver', 'lessThanOrEqual': '7.1.*'}, {'status': 'unaffected', 'version': '7.2-rc1', 'versionType': 'original_commit_for_fix', 'lessThanOrEqual': '*'}], 'programFiles': ['net/ipv6/addrconf.c'], 'defaultStatus': 'affected'}] Added Description In the Linux kernel, the following vulnerability has been resolved: ipv6: addrconf: bail out of dad_failure when state is no longer POSTDAD addrconf_dad_failure() transitions ifp->state from DAD to POSTDAD via addrconf_dad_end(), which drops ifp->lock on return. The lock is re-acquired after net_info_ratelimited(). A concurrent ipv6_del_addr() can take the lock in that window, set ifp->state to DEAD and run list_del_rcu(&ifp->if_list). addrconf_dad_failure() then overwrites DEAD with ERRDAD at errdad: and schedules a new dad_work. The work calls ipv6_del_addr() again, hitting the already-poisoned list entry: general protection fault: 0000 [#1] SMP NOPTI CPU: 4 PID: 217 Comm: kworker/4:1 Workqueue: ipv6_addrconf addrconf_dad_work RIP: 0010:ipv6_del_addr+0xe9/0x280 RAX: dead000000000122 Call Trace: addrconf_dad_stop+0x113/0x140 addrconf_dad_work+0x28c/0x430 process_one_work+0x1eb/0x3b0 worker_thread+0x4d/0x400 kthread+0x104/0x140 ret_from_fork+0x35/0x40 Fold the addrconf_dad_end() logic into addrconf_dad_failure() under a single ifp->lock critical section. The STABLE_PRIVACY branch temporarily drops ifp->lock around address regeneration, so at lock_errdad: verify the state is still POSTDAD before transitioning to ERRDAD; bail out otherwise to avoid overwriting a state set by another path while the lock was released. Added Reference https://git.kernel.org/stable/c/3bdc86d89fd6c6523753fa6f42fcfaf30ee699cb Added Reference https://git.kernel.org/stable/c/47b05836705b63dab93d9ac7c69a3a507375ef80 Added Reference https://git.kernel.org/stable/c/627ac78f2741e2ebd2225e2e953b6964a8a9182f Added Reference https://git.kernel.org/stable/c/875c284c0f98b042bb97abad460f63a24c977f88 Added Reference https://git.kernel.org/stable/c/8ed0ce9ea58d677d1bac92614ee5f60f8ea57363 Added Reference https://git.kernel.org/stable/c/b61af0268e3d1308c466bf0be5dced844eafc1ef Added Reference https://git.kernel.org/stable/c/d21be7d051012c6b572fa4e3334443c250216f7b Added Reference https://git.kernel.org/stable/c/e889aa99ad3ed48bb0ddcff6475b17542532d18b