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CVE-2026-89940— iio: buffer: Tie IIO dma fence lock lifetime to the fence

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： iio: buffer: 将 IIO DMA 栅栏（fence）锁的生命周期与栅栏本身绑定 当前 实现使用嵌入在 结构体中的锁。然而， 的生命周期可能长于 ，这可能导致“释放后使用”（use-after-free）问题。 通过将锁嵌入到与栅栏相同的结构体中，将锁的生命周期与栅栏的生命周期绑定起来。 我们不能简单地从 持有对 的引用，因为 可能会睡眠，而栅栏的释放回调（release callback）不允许发生睡眠。 请注意， 框架现在已经拥有一个内部锁，当在 中传入

CVSS 7.8 · High EPSS 0.17% · P6

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 10

VendorProduct Version RangeStatus
Linux Linux 3e26d9f08fbe0b73e951a5e810fdb7a332b7e37f< 6865d79fca17a80fbd60c12550ca9a5e0e20e0eb affected
3e26d9f08fbe0b73e951a5e810fdb7a332b7e37f< 510497e31be4f241103507315a859e2085ccb081 affected
3e26d9f08fbe0b73e951a5e810fdb7a332b7e37f< 8b3e221590181a8beb3735bbabf166df02c839b5 affected
3e26d9f08fbe0b73e951a5e810fdb7a332b7e37f< f25ec4627d935dedfb5fe83bd2c2678cdcc19611 affected
6.11 affected
< 6.11 unaffected
6.12.110≤ 6.12.* unaffected
6.18.51≤ 6.18.* unaffected
… +2 more rows
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I. Basic Information for CVE-2026-89940

Vulnerability Information
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Vulnerability Title
iio: buffer: Tie IIO dma fence lock lifetime to the fence
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: iio: buffer: Tie IIO dma fence lock lifetime to the fence The `iio_dma_fence` implementation currently uses a lock embedded in the `iio_dmabuf_priv`. But the `iio_dma_fence` can outlive the `iio_dmabuf_priv`, which can cause a use-after-free. Tie the lifetime of the lock to the lifetime of the fence by embedding them in the same struct. We can't just hold a reference to the `iio_dmabuf_priv` from the `iio_dma_fence` since `iio_buffer_dmabuf_release()` might sleep and the fence release callback is not allowed to sleep. Note that the `dma_fence` framework now has an internal lock that gets used when the passing `NULL` for `lock` in `dma_fence_init()`, but in order to allow this patch to be backportable use an external lock.
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 3e26d9f08fbe0b73e951a5e810fdb7a332b7e37f ~ 6865d79fca17a80fbd60c12550ca9a5e0e20e0eb -
Linux Linux 6.11 -

II. Public POCs for CVE-2026-89940

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III. Intelligence Information for CVE-2026-89940

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Other References for CVE-2026-89940 (4)

Same Patch Batch · Linux · 2026-09-16 · 276 CVEs total

CVE-2026-90048 9.8 CRITICAL fs/ntfs3: fix slab-out-of-bounds write in ni_create_attr_list()
CVE-2026-90012 9.8 CRITICAL spi: Fix DMA mapping ownership on partial map failure
CVE-2026-89970 9.8 CRITICAL nvmet-auth: Synchronize timeout work during SQ teardown
CVE-2026-89857 9.8 CRITICAL scsi: qla2xxx: Hold qpair lock when sending NVMe LS reject
CVE-2026-89969 9.8 CRITICAL nvmet-tcp: fix out-of-bounds write when receiving an over-long PDU
CVE-2026-89847 9.8 CRITICAL scsi: qla2xxx: Avoid double completion in async IOCB timeout
CVE-2026-89972 9.8 CRITICAL nvme: add missing SRCU grace period in error path
CVE-2026-89990 9.8 CRITICAL ceph: lock mutex in ceph_mds_check_access()
CVE-2026-90036 9.8 CRITICAL NFSD: Prevent client use-after-free during blocked-lock reaping
CVE-2026-90038 9.8 CRITICAL NFSD: Prevent client use-after-free during export state revocation
CVE-2026-90037 9.8 CRITICAL NFSD: Prevent client use-after-free during close_lru reaping
CVE-2026-89788 9.8 CRITICAL ksmbd: fix tree connection use-after-free in smb2_tree_connect()
CVE-2026-89783 9.8 CRITICAL xfrm6: fix out-of-bounds write in xfrm6_input_addr() when secpath is full
CVE-2026-90042 9.8 CRITICAL ceph: properly decrypt filenames in vmalloc() buffers
CVE-2026-89778 9.8 CRITICAL isofs: fix out-of-bounds page array access on empty zisofs block
CVE-2026-89915 9.3 CRITICAL KVM: arm64: Remove VM-wide VNCR mapping counter
CVE-2026-90049 9.3 CRITICAL net: skbuff: don't skb_tx_error() the source skb in skb_zerocopy()
CVE-2026-89775 9.3 CRITICAL KVM: arm64: Handle negative S1 walk levels in VNCR TLB size evaluation
CVE-2026-89916 9.3 CRITICAL KVM: arm64: Make VNCR invalidation participate in MMU invalidation retry
CVE-2026-89930 9.3 CRITICAL KVM: nVMX: Service local TLB flushes on failed nested VM-Enter

Showing top 20 of 276 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-89940

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