IB/IPoIB: Avoid restoring OPER_UP after multicast flush
Summary
| CVE | CVE-2026-98347 |
|---|---|
| State | PUBLISHED |
| Assigner | Linux |
| Source Priority | CVE Program / NVD first with legacy fallback |
| Published | 2026-10-06 09:18:27 UTC |
| Updated | 2026-10-19 10:18:37 UTC |
| Description | In the Linux kernel, the following vulnerability has been resolved: IB/IPoIB: Avoid restoring OPER_UP after multicast flush ipoib_ib_dev_flush_light() temporarily clears IPOIB_FLAG_OPER_UP to prevent multicast joins while ipoib_mcast_dev_flush() is running, and restores the flag afterwards if it was previously set. This restore races with ipoib_ib_dev_down(). If the interface is brought down while the flush is in progress, ipoib_ib_dev_down() clears IPOIB_FLAG_OPER_UP, but the flush path may set it again after the device has already gone down. Since commit 894021a75291 ("IB/ipoib: Make the carrier_on_task race aware"), ipoib_mcast_carrier_on_task() relies on IPOIB_FLAG_OPER_UP being cleared to terminate its rtnl_trylock() retry loop. If the flag is left set after shutdown, the workqueue retries forever, causing teardown to deadlock when ipoib_ndo_uninit() waits in destroy_workqueue() while holding RTNL. Instead of overloading IPOIB_FLAG_OPER_UP to block multicast joins during a light flush, introduce a dedicated IPOIB_FLAG_MCAST_FLUSH flag. Use it together with IPOIB_FLAG_OPER_UP to determine whether multicast joins are allowed, avoiding the race with device shutdown. |
Risk And Classification
EPSS: 0.001840000 probability, percentile 0.072960000 (date 2026-10-06)
Vendor Declared Affected Products
| Source | Vendor | Product | Version | Platforms |
|---|---|---|---|---|
| CNA | Linux | Linux | affected 344bacca8cd811809fc33a249f2738ab757d327f f973769fb7cb33ba0d4a64b7dcfee0cabaead938 git | Not specified |
| CNA | Linux | Linux | affected 344bacca8cd811809fc33a249f2738ab757d327f b72f38929f4b5aa83161fd3b22a7327207e51ec5 git | Not specified |
| CNA | Linux | Linux | affected 344bacca8cd811809fc33a249f2738ab757d327f 1b11e4b55b41d9e69a8e8d07622614202e2eaca9 git | Not specified |
| CNA | Linux | Linux | affected 344bacca8cd811809fc33a249f2738ab757d327f 326f7d34bd7e64de535566b65c0533b640df5a81 git | Not specified |
| CNA | Linux | Linux | affected 344bacca8cd811809fc33a249f2738ab757d327f 5ad925d45f28464a5e043c9620880bb6a030da89 git | Not specified |
| CNA | Linux | Linux | affected 344bacca8cd811809fc33a249f2738ab757d327f 188b334a6db36a8e0bfaaf59bc4020639a0f3aad git | Not specified |
| CNA | Linux | Linux | affected 344bacca8cd811809fc33a249f2738ab757d327f 1ff3add37c329704ec46181b4ae4f00f9f16ce6f git | Not specified |
| CNA | Linux | Linux | affected 344bacca8cd811809fc33a249f2738ab757d327f 9a141d3dc869d18b2eab35e999f4790a9b84e40f git | Not specified |
| CNA | Linux | Linux | affected a289c65ca49d2680a3d797e633e57a45573d1df2 git | Not specified |
| CNA | Linux | Linux | affected b81459c78935e4579a577b2366c5f8878d3c7fee git | Not specified |
| CNA | Linux | Linux | affected 8a9d8dc9ce83a90bfbbe69181acc4cf1beff46f5 git | Not specified |
| CNA | Linux | Linux | affected dfe809702a11bd7fb91c882fb55620e39ce22109 git | Not specified |
| CNA | Linux | Linux | affected 87160fb51bc343793cc8f5f031a87f1a35aecb82 git | Not specified |
| CNA | Linux | Linux | affected 749fd55dd210f9676f0d445a6efaaa3bec65174a git | Not specified |
| CNA | Linux | Linux | affected 3.2.84 3.3 semver | Not specified |
| CNA | Linux | Linux | affected 3.10.105 3.11 semver | Not specified |
| CNA | Linux | Linux | affected 3.12.65 3.13 semver | Not specified |
| CNA | Linux | Linux | affected 3.16.39 3.17 semver | Not specified |
| CNA | Linux | Linux | affected 4.4.24 4.5 semver | Not specified |
| CNA | Linux | Linux | affected 4.7.7 4.8 semver | Not specified |
| CNA | Linux | Linux | affected 4.8 | Not specified |
| CNA | Linux | Linux | unaffected 4.8 semver | Not specified |
| CNA | Linux | Linux | unaffected 5.10.271 5.10.* semver | Not specified |
| CNA | Linux | Linux | unaffected 5.15.222 5.15.* semver | Not specified |
| CNA | Linux | Linux | unaffected 6.1.189 6.1.* semver | Not specified |
| CNA | Linux | Linux | unaffected 6.6.158 6.6.* semver | Not specified |
| CNA | Linux | Linux | unaffected 6.12.112 6.12.* semver | Not specified |
| CNA | Linux | Linux | unaffected 6.18.54 6.18.* semver | Not specified |
| CNA | Linux | Linux | unaffected 7.2.8 7.2.* semver | Not specified |
| CNA | Linux | Linux | unaffected 7.3 * original_commit_for_fix | Not specified |
References
| Reference | Source | Link | Tags |
|---|---|---|---|
| git.kernel.org/stable/c/326f7d34bd7e64de535566b65c0533b640df5a81 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/188b334a6db36a8e0bfaaf59bc4020639a0f3aad | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/5ad925d45f28464a5e043c9620880bb6a030da89 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/b72f38929f4b5aa83161fd3b22a7327207e51ec5 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/f973769fb7cb33ba0d4a64b7dcfee0cabaead938 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/1b11e4b55b41d9e69a8e8d07622614202e2eaca9 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/1ff3add37c329704ec46181b4ae4f00f9f16ce6f | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/9a141d3dc869d18b2eab35e999f4790a9b84e40f | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| CVE Program record | CVE.ORG | www.cve.org | canonical |
| NVD vulnerability detail | NVD | nvd.nist.gov | canonical, analysis |
No vendor comments have been submitted for this CVE.
There are currently no legacy QID mappings associated with this CVE.