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CVE-2026-93137— bpf: Fix use-after-free on mm_struct in bpf_find_vma()

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，以下漏洞已被修复： bpf：修复 bpf_find_vma() 中 mm_struct 的释放后使用（use-after-free）问题 函数读取 并调用 ，但在此过程中未持有对 的引用计数。对于外部任务（foreign task），并发执行的 可能在无锁读取与尝试加锁之间释放 ，从而导致释放后使用（use-after-free）。此外， 并非 类型。 对于当前任务， 是稳定的。对于外部任务，应在 的保护下固定（pin） ，并通过 释放该引用，这与提交 d8e27d2d22b6（“bpf：修

CVSS 7.8 · High EPSS 0.17% · P6

Possible ATT&CK Techniques 2 AI

T1069 · Permission Groups Discovery T1015

Affected Version Matrix 14

VendorProduct Version RangeStatus
Linux Linux 7c7e3d31e7856a8260a254f8c71db416f7f9f5a1< db347840d6b6ee9bb9b8e4a985d4b4419f9f3200 affected
7c7e3d31e7856a8260a254f8c71db416f7f9f5a1< 8e1101fc4118019a69c96ced4aec93164f89cbd5 affected
7c7e3d31e7856a8260a254f8c71db416f7f9f5a1< c7ad910e987008e125eeff448892e86852173384 affected
7c7e3d31e7856a8260a254f8c71db416f7f9f5a1< 86d54cf069fc5ae2e111c87933bebf6eb527978e affected
7c7e3d31e7856a8260a254f8c71db416f7f9f5a1< 2b2a903bee56d312539046d9defa8023eec94760 affected
7c7e3d31e7856a8260a254f8c71db416f7f9f5a1< 47b079e2117a2ee52e21f8b72935900c702fc0b5 affected
5.17 affected
< 5.17 unaffected
… +6 more rows
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I. Basic Information for CVE-2026-93137

Vulnerability Information
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Vulnerability Title
bpf: Fix use-after-free on mm_struct in bpf_find_vma()
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: bpf: Fix use-after-free on mm_struct in bpf_find_vma() bpf_find_vma() reads task->mm and calls mmap_read_trylock(mm) without holding a reference on the mm. On a foreign task, a concurrent exit_mm() can free the mm_struct between the lockless read and the trylock, resulting in a use-after-free. mm_struct is not SLAB_TYPESAFE_BY_RCU. For the current task, task->mm is stable. For a foreign task, pin the mm under task->alloc_lock and release it with mmput_async(), mirroring commit d8e27d2d22b6 ("bpf: fix mm lifecycle in open-coded task_vma iterator"). Use spin_trylock() instead of get_task_mm() so BPF context does not block on alloc_lock. Reject irqs-disabled contexts and !CONFIG_MMU on the foreign-task path because dropping the mm reference is not safe there. Race: CPU0 (BPF program) CPU1 (exiting task) ============================ ========================== bpf_find_vma(foreign_task): mm = task->mm exit_mm(): task->mm = NULL mmput(mm) -> frees mm_struct mmap_read_trylock(mm) // UAF on mm
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
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 7c7e3d31e7856a8260a254f8c71db416f7f9f5a1 ~ db347840d6b6ee9bb9b8e4a985d4b4419f9f3200 -
Linux Linux 5.17 -

II. Public POCs for CVE-2026-93137

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III. Intelligence Information for CVE-2026-93137

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Patches & Fixes for CVE-2026-93137 (6)

Same Patch Batch · Linux · 2026-09-17 · 600 CVEs total

CVE-2026-92489 9.8 CRITICAL xfrm: Fix skb double-free in xfrm_dev_direct_output()
CVE-2026-90151 9.8 CRITICAL NFSv4: remove callback IDR entry on client allocation failure
CVE-2026-90235 9.8 CRITICAL sunrpc: xprtsock: annotate shared socket callbacks with READ_ONCE/WRITE_ONCE
CVE-2026-90104 9.8 CRITICAL NFSv4.1: zero referring call lists before decoding
CVE-2026-90173 9.8 CRITICAL smb: smbdirect: free completion queues with ib_free_cq()
CVE-2026-90110 9.4 CRITICAL inetpeer: randomize RB-tree node comparison using SipHash
CVE-2026-90230 9.1 CRITICAL nvmet: fix heap out-of-bounds read in nvmet_auth_negotiate()
CVE-2026-90413 9.1 CRITICAL IB/isert: reject login PDUs declaring more data than was received
CVE-2026-90414 9.1 CRITICAL IB/isert: reject PDUs declaring more data than was received
CVE-2026-90425 8.8 HIGH iommu/tegra241-cmdqv: Require exactly one Stream ID for a vSID
CVE-2026-93042 8.8 HIGH dmaengine: dw-edma: Terminate all descriptors without callbacks
CVE-2026-93189 8.8 HIGH HID: core: quiesce input in hid_hw_stop() to prevent use-after-free
CVE-2026-90329 8.8 HIGH HID: synchronize input before cleaning up a failed probe
CVE-2026-90357 8.8 HIGH wifi: mt76: mt7915: unlink TWT flow if the MCU rejects the agreement
CVE-2026-90256 8.8 HIGH Bluetooth: L2CAP: use proto_lock for l2cap_data to fix l2cap_disconn_ind
CVE-2026-90367 8.8 HIGH wifi: mt76: mt7996: hold dev->mt76.mutex while disabling tx worker in SER
CVE-2026-90381 8.8 HIGH wifi: mt76: fix handling channel context with different bands in mt76_switch_vif_chanctx()
CVE-2026-90379 8.8 HIGH wifi: mt76: mt7921: Add PCIe AER handler support to prevent system crash
CVE-2026-90380 8.8 HIGH wifi: mt76: mt792x: fix use-after-free in mt76_rx_poll_complete
CVE-2026-90371 8.8 HIGH wifi: mt76: fix RXDMAD_C buffer recycling race

Showing top 20 of 600 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-93137

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