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CVE-2026-98347— IB/IPoIB: Avoid restoring OPER_UP after multicast flush

Quick assessment

Affected
Linux Linux
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

在 Linux 内核中，已修复以下漏洞： IB/IPoIB：避免在组播刷新后恢复 OPER_UP 标志 在运行 期间，会临时清除 标志，以防止进行组播加入操作；并在刷新完成后，如果该标志之前已设置，则恢复它。 然而，这一恢复操作与 之间存在竞态条件。如果在刷新进行期间接口被关闭， 会清除 ，但刷新路径可能在设备已经关闭之后再次设置该标志。 自提交 894021a75291（“IB/ipoib：使 carrier_on_task 感知竞态”）以来， 依赖 被清除来终止其 重试循环。如果关闭后该标志仍保持设置状态，工作

AI Predicted 5.0 Difficulty: Moderate EPSS 0.18% · P7

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service

Affected Version Matrix 30

VendorProduct Version RangeStatus
Linux Linux 344bacca8cd811809fc33a249f2738ab757d327f< f973769fb7cb33ba0d4a64b7dcfee0cabaead938 affected
344bacca8cd811809fc33a249f2738ab757d327f< b72f38929f4b5aa83161fd3b22a7327207e51ec5 affected
344bacca8cd811809fc33a249f2738ab757d327f< 1b11e4b55b41d9e69a8e8d07622614202e2eaca9 affected
344bacca8cd811809fc33a249f2738ab757d327f< 326f7d34bd7e64de535566b65c0533b640df5a81 affected
344bacca8cd811809fc33a249f2738ab757d327f< 5ad925d45f28464a5e043c9620880bb6a030da89 affected
344bacca8cd811809fc33a249f2738ab757d327f< 188b334a6db36a8e0bfaaf59bc4020639a0f3aad affected
344bacca8cd811809fc33a249f2738ab757d327f< 1ff3add37c329704ec46181b4ae4f00f9f16ce6f affected
344bacca8cd811809fc33a249f2738ab757d327f< 9a141d3dc869d18b2eab35e999f4790a9b84e40f affected
… +22 more rows
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I. Basic Information for CVE-2026-98347

Vulnerability Information
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Vulnerability Title
IB/IPoIB: Avoid restoring OPER_UP after multicast flush
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux 344bacca8cd811809fc33a249f2738ab757d327f ~ f973769fb7cb33ba0d4a64b7dcfee0cabaead938 -
Linux Linux 4.8 -

II. Public POCs for CVE-2026-98347

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III. Intelligence Information for CVE-2026-98347

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Patches & Fixes for CVE-2026-98347 (8)

Same Patch Batch · Linux · 2026-10-06 · 208 CVEs total

CVE-2026-98323 9.8 CRITICAL RDMA/siw: Bound fragmented header copies by the remaining length
CVE-2026-98365 9.8 CRITICAL RDMA/rxe: Fix integer overflow in mr_check_range() leading to OOB access
CVE-2026-98282 8.8 HIGH powerpc/iommu: Fix the overflow validation in iommu_tce_check_ioba
CVE-2026-98283 8.8 HIGH KVM: PPC: Book3S HV: fix use-after-free in kvmhv_emulate_tlbie_all_lpid()
CVE-2026-98339 8.8 HIGH wifi: cfg80211: don't filter by BSS type when removing stale entries
CVE-2026-98171 8.8 HIGH smb: client: fix next_buffer UAF and NextCommand bounds in compound PDUs
CVE-2026-98261 8.1 HIGH cifs: Fix server use-after-free in cifs_chan_skip_or_disable()
CVE-2026-98357 8.1 HIGH IB/isert: wait for deferred control PDU completions before releasing the connection
CVE-2026-98239 8.1 HIGH net: lan743x: fix RX checksum use-after-free
CVE-2026-98341 7.8 HIGH wifi: cfg80211: don't free driver-owned scan requests
CVE-2026-98281 7.8 HIGH futex: Also allocate private hash on vfork()
CVE-2026-98324 7.8 HIGH dmaengine: pxa: fix double counting of the hw descriptors
CVE-2026-98320 7.8 HIGH netfilter: flowtable: hold reference on ct until flow is released
CVE-2026-98228 7.8 HIGH mips: select CONFIG_WEAK_REORDERING_BEYOND_LLSC from CONFIG_EYEQ
CVE-2026-98229 7.8 HIGH xfrm: save input state data before secpath resets
CVE-2026-98318 7.8 HIGH smb: client: validate absolute native symlink targets before NT fixups
CVE-2026-98315 7.8 HIGH ntfs: protect runlist updates with the runlist lock
CVE-2026-98260 7.8 HIGH exec: Cleanup POSIX timers right after de_thread()
CVE-2026-98256 7.8 HIGH signal: Prevent exec() race
CVE-2026-98258 7.8 HIGH posix-cpu-timers: Prevent freeing a timer which is queued on the expiry list

Showing top 20 of 208 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-98347

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