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CVE-2026-90247— bpf: Fix mmap_lock leak in irq_work path

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： bpf: 修复 irq_work 路径中 mmap_lock 泄漏问题 引入了一个每 CPU 的 ，用于从 NMI 上下文中延迟执行 ，而 后来复用了同一个 。这两个调用方在获取 之前，仅检查工作项是否正忙，因此嵌套的调用方可能在第一个调用方将其入队之前就复用了该槽位。这可能导致同时获取了两个读锁，但只执行了一次延迟的解锁操作，从而导致一个读锁泄漏，进而阻塞 。 修复方案： 在调用 之前预先保留（reserve）每 CPU 槽位。在 和 中使用相同的包装器，以便在 失败

AI Predicted 5.5 Difficulty: Hard

Affected Version Matrix 12

VendorProduct Version RangeStatus
Linux Linux eac9153f2b584c702cea02c1f1a57d85aa9aea42< a052ad5edccf5319f50ed955de4368f8318a9f20 affected
eac9153f2b584c702cea02c1f1a57d85aa9aea42< 051f2da26ce377f683b938a3382e0f16d02f3139 affected
eac9153f2b584c702cea02c1f1a57d85aa9aea42< fa9dcacdcdf487f0ffef64bf67622f1caed509f1 affected
a7f4da875c16f3b8bef0d9ec67528111045bfcd8 affected
f1838da73cccb238b8be4ef464fce0168dc7ba84 affected
4.19.92< 4.20 affected
5.4.7< 5.5 affected
5.5 affected
… +4 more rows
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I. Basic Information for CVE-2026-90247

Vulnerability Information
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Vulnerability Title
bpf: Fix mmap_lock leak in irq_work path
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: bpf: Fix mmap_lock leak in irq_work path stack_map_get_build_id_offset() introduced a per-CPU irq_work to defer mmap_read_unlock() from NMI context, and bpf_find_vma() later reused the same mmap_unlock_work. Both callers only check whether the work is busy before taking mmap_lock, so a nested caller can reuse the slot before the first caller queues it. Two read locks may then be acquired while only one deferred unlock runs, leaking a read lock and blocking exit_mmap(). Reserve the per-CPU slot before mmap_read_trylock(). Use the same wrapper in stackmap and bpf_find_vma() so both callers release the reservation on trylock failure. Keep rejecting the slot while the irq_work remains busy. Release it after the irq_work callback unlocks the mm.
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 eac9153f2b584c702cea02c1f1a57d85aa9aea42 ~ a052ad5edccf5319f50ed955de4368f8318a9f20 -
Linux Linux 5.5 -

II. Public POCs for CVE-2026-90247

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III. Intelligence Information for CVE-2026-90247

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Patches & Fixes for CVE-2026-90247 (1)

Other References for CVE-2026-90247 (2)

Same Patch Batch · Linux · 2026-09-17 · 602 CVEs total

CVE-2026-90257 Bluetooth: virtio_bt: avoid OOB read of build info string
CVE-2026-90238 media: amd: isp4: fix self-deadlock in isp4sd_pwron_and_init() error path
CVE-2026-90240 iommu/vt-d: Flush context cache with correct SID when tearing down aliases
CVE-2026-90239 media: amd: isp4: release partial allocations in isp4if_alloc_fw_gpumem()
CVE-2026-90241 iommu/vt-d: Tear down scalable-mode context on probe failure
CVE-2026-90243 iommu/vt-d: Clear Present bit before tearing down copied context entry
CVE-2026-90242 iommu/vt-d: Fix iopf_refcount leak on RID domain replacement
CVE-2026-90244 iommu/dma: Restore locking around msi_page_list
CVE-2026-90245 fbdev: kyro: Validate overlay viewport coordinates
CVE-2026-90246 apparmor: fix integer overflow in verify_tags() bounds check
CVE-2026-90248 net/sched: cls_api: fix teardown of an adopted proto on insert-race loss
CVE-2026-90249 iio: light: gp2ap002: Fix unbalanced runtime PM on repeated event writes
CVE-2026-90250 bpf, cgroup: Fix storage null-ptr-deref after replacing prog
CVE-2026-90251 Bluetooth: MSFT: validate evt_prefix_len against the response length
CVE-2026-90253 Bluetooth: MGMT: free the mesh send cancel command when it is cancelled
CVE-2026-90252 Bluetooth: MGMT: free the HCI command when it is cancelled
CVE-2026-90254 Bluetooth: hci_sync: free the advertising instance on the failure and cancel paths
CVE-2026-90256 Bluetooth: L2CAP: use proto_lock for l2cap_data to fix l2cap_disconn_ind
CVE-2026-90255 Bluetooth: hci_conn: fix the SCO setup context lifetime
CVE-2026-90267 scsi: sd: Fix special_vec mempool leak when scsi_alloc_sgtables() fails

Showing top 20 of 602 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-90247

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