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CVE-2026-98217— IB/mlx4: Fix use-after-free on pkey sysfs registration failure

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，以下漏洞已得到修复： IB/mlx4：修复 pkey sysfs 注册失败时的 use-after-free（释放后使用）问题 忽略了 返回的错误，并继续注册其余的从设备（slave）。每个从设备的错误处理路径已经释放了 pkey 父级 kobject，但其指针仍然保存在设备结构体中。随后的设备清理操作会将这些失效的指针传递给 ，从而导致 use-after-free。 在释放失败的从设备树后，清除父级指针，并在设备清理期间跳过未注册的树。这既保留了现有的“尽力而为”注册行为，又防止了对失败

AI Predicted 4.4 Difficulty: Hard EPSS 0.18% · P7

Possible ATT&CK Techniques 1 AI

T1068 · Exploitation for Privilege Escalation

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux c1e7e466120b80ce49e91af0c9da1ce6dee4844a< 791471421d848ce13e84f4b21c9e19973d471c4e affected
c1e7e466120b80ce49e91af0c9da1ce6dee4844a< 734f066933484f6c7cedea0312763249beed5845 affected
c1e7e466120b80ce49e91af0c9da1ce6dee4844a< a07bee32127d7c4cd3b1bb9a088e21d0c93634c9 affected
c1e7e466120b80ce49e91af0c9da1ce6dee4844a< cf20d7476754c00eec04ae23d3e929de33ce0345 affected
c1e7e466120b80ce49e91af0c9da1ce6dee4844a< 0c3482e965b18bc242e54e899d1c4d391ca8e5e3 affected
c1e7e466120b80ce49e91af0c9da1ce6dee4844a< ffb80872617b5f9b3dd1536ec2909029fa66f228 affected
c1e7e466120b80ce49e91af0c9da1ce6dee4844a< ced1186fea7c77e16681c7ef4802897885989c3b affected
c1e7e466120b80ce49e91af0c9da1ce6dee4844a< 1af874e9f4ce22ccf8b10ab5462f32c70d3be21a affected
… +10 more rows
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I. Basic Information for CVE-2026-98217

Vulnerability Information
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Vulnerability Title
IB/mlx4: Fix use-after-free on pkey sysfs registration failure
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: IB/mlx4: Fix use-after-free on pkey sysfs registration failure register_pkey_tree() ignores errors from register_one_pkey_tree() and continues registering the remaining slaves. The per-slave error path has already released the pkey parent kobjects, but their pointers remain stored in the device. A later device cleanup therefore passes the stale pointers to kobject_put(), causing a use-after-free. Clear the parent pointers after releasing a failed slave tree and skip unregistered trees during device cleanup. This preserves the existing best-effort registration behavior while preventing a second cleanup of the failed tree.
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 c1e7e466120b80ce49e91af0c9da1ce6dee4844a ~ 791471421d848ce13e84f4b21c9e19973d471c4e -
Linux Linux 3.7 -

II. Public POCs for CVE-2026-98217

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III. Intelligence Information for CVE-2026-98217

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Patches & Fixes for CVE-2026-98217 (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-2026-98324 7.8 HIGH dmaengine: pxa: fix double counting of the hw descriptors
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-2026-98320 7.8 HIGH netfilter: flowtable: hold reference on ct until flow is released
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
CVE-2026-98254 7.8 HIGH swiotlb: use the adjusted address for the highmem page lookup

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-2026-98217

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