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NVD / CVE Program· CNA Linux

CVE-2026-74398: ipv6: addrconf: bail out of dad_failure when state is no longer POSTDAD

Noroxi assessment

Priority: Monitor (action score 39/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.51% (FIRST EPSS).
  • Anyone who can reach it over the internet can trigger it. No account or password is required. No user action is required. No special conditions are required; it is repeatable.
  • According to CISA the attack is automatable: targets can be found by mass scanning.
  • Fixed version: Linux Linux 3.11, 3bdc86d89fd6c6523753fa6f42fcfaf30ee699cb, 47b05836705b63dab93d9ac7c69a3a507375ef80.

Low priority for now. Upgrade to Linux Linux 3.11, 3bdc86d89fd6c6523753fa6f42fcfaf30ee699cb, 47b05836705b63dab93d9ac7c69a3a507375ef80 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

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.

CriticalCVSS 9.8 · v3.1—No exploit Fix available
Published
Aug 15, 2026
Updated
Oct 16, 2026
EPSS
0.5% · 44th percentile
CWE
—

Report tools

JSON

Action score

39

Monitor

Low priority for now.

CVSS
39 / 40 · 9.8 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.5%

CISA SSVC decision

Exploitation
none
Automatable
yes
Technical impact
total

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
—
CNA · Linux
9.8
NVD has not scored this yet; the score shown is the CNA’s.

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

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  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

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When you'll hear from us

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  • when exploit code appears or is weaponized
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  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

—

Versions reported by the vendor

Affected version ranges reported by the assigning authority (Linux). Independent of NVD's CPE analysis and usually ahead of it.

  • Linux Linux

    • 835b474b8f70fa68d68abffad37378e92f661802, 3.14affected
    • c15b1ccadb323ea50023e8f1cca2954129a62b51 and later · before 47b05836705b63dab93d9ac7c69a3a507375ef80affected · git
    • c15b1ccadb323ea50023e8f1cca2954129a62b51 and later · before d21be7d051012c6b572fa4e3334443c250216f7baffected · git
    • c15b1ccadb323ea50023e8f1cca2954129a62b51 and later · before 875c284c0f98b042bb97abad460f63a24c977f88affected · git
    • c15b1ccadb323ea50023e8f1cca2954129a62b51 and later · before 8ed0ce9ea58d677d1bac92614ee5f60f8ea57363affected · git
    • c15b1ccadb323ea50023e8f1cca2954129a62b51 and later · before 3bdc86d89fd6c6523753fa6f42fcfaf30ee699cbaffected · git
    • c15b1ccadb323ea50023e8f1cca2954129a62b51 and later · before b61af0268e3d1308c466bf0be5dced844eafc1efaffected · git
    • c15b1ccadb323ea50023e8f1cca2954129a62b51 and later · before e889aa99ad3ed48bb0ddcff6475b17542532d18baffected · git
    • c15b1ccadb323ea50023e8f1cca2954129a62b51 and later · before 627ac78f2741e2ebd2225e2e953b6964a8a9182faffected · git
    • 3.10.105 and later · before 3.11affected · semver

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 6.1.180-16.1.180-1
Debian:13linuxbefore 6.12.100-16.12.100-1
Debian:14linuxbefore 7.1.5-17.1.5-1

Same product

linux: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-74705udp: fix potential use-after-free in tunnel segmentation
    40Plan
  • CVE-2026-74612veth: fix skb length accounting after XDP frag adjustment
    40Plan
  • CVE-2026-74475vxlan: use neigh_ha_snapshot() in route_shortcircuit()
    40Plan

Published before and after this one in the same product

  • ← EarlierCVE-2026-74396Aug 15, 2026 · RDMA/mlx5: Fix UMR XLT cleanup on ODP populate failure
    30Monitor
  • ← EarlierCVE-2026-74397Aug 15, 2026 · IB/mlx5: Fix transport-domain rollback and initialize lb mutex earlier
    31Monitor
  • Later →CVE-2026-74399Aug 15, 2026 · evm: terminate and bound the evm_xattrs read buffer
    0Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
Linux Linux3.11Vendor (CNA)
Linux Linux3bdc86d89fd6c6523753fa6f42fcfaf30ee699cbVendor (CNA)
Linux Linux47b05836705b63dab93d9ac7c69a3a507375ef80Vendor (CNA)
Linux Linux627ac78f2741e2ebd2225e2e953b6964a8a9182fVendor (CNA)
Linux Linux875c284c0f98b042bb97abad460f63a24c977f88Vendor (CNA)
Linux Linux8ed0ce9ea58d677d1bac92614ee5f60f8ea57363Vendor (CNA)
Linux Linuxb61af0268e3d1308c466bf0be5dced844eafc1efVendor (CNA)
Linux Linuxd21be7d051012c6b572fa4e3334443c250216f7bVendor (CNA)
Linux Linuxe889aa99ad3ed48bb0ddcff6475b17542532d18bVendor (CNA)
debian:linux6.1.180-1 · Debian:12Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

  • Anyone who can reach it over the internet can trigger it.
  • No account or password is required.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
high · data can be read
Integrity
high · data or configuration can be modified
Availability
high · the service can be disrupted
Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality impact
High
Integrity impact
High
Availability impact
High

Weakness class (CWE)

—

CVSS vector

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

nvd-secondary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

Change log

  1. SSVC exploitation— → none
  2. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Show all references (7 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records