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CVE-2026-98243— dma-buf/dma-fence: fix checking signaling bit for timeline and driver name v3

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： dma-buf/dma-fence：修复时间线及驱动名称的信号状态位检查（v3） 补丁 “dma-buf: dma-fence: 修复潜在的空指针解引用” 将检查逻辑从测试信号状态位（signaled bit）改为测试 ops 指针，以避免当 ops 指针被置为空时可能发生空指针解引用。 但问题是，目前仅当未实现 release 回调和 wait 回调时，ops 指针才会被置空，而许多 dma_fence 实现仍不满足这一条件。因此，对于这些实现而言，在返回字符串发出信号（

CVSS 7.1 · High EPSS 0.12% · P2

Possible ATT&CK Techniques 1 AI

T1068 · Exploitation for Privilege Escalation

Affected Version Matrix 8

VendorProduct Version RangeStatus
Linux Linux 035219a760edb35ae9a9e96beba7f122e26a997b< a4db25b8949d6ff9c1a685a1273a015e8bab29db affected
035219a760edb35ae9a9e96beba7f122e26a997b< 3ed11c671ff7ec58c8fd96410233c677df23f407 affected
15ecfdf0ef6f6d874d0a26690d300857b39ebfd0 affected
7.1.5< 7.2 affected
7.2 affected
< 7.2 unaffected
7.2.8≤ 7.2.* unaffected
7.3-rc4≤ * unaffected
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I. Basic Information for CVE-2026-98243

Vulnerability Information
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Vulnerability Title
dma-buf/dma-fence: fix checking signaling bit for timeline and driver name v3
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: dma-buf/dma-fence: fix checking signaling bit for timeline and driver name v3 The patch "dma-buf: dma-fence: Fix potential NULL pointer dereference" changed the check to test for the ops pointer instead of the signaled bit to avoid a potential NULL dereference when the ops pointer has been cleared. The problem is now that the ops pointer is cleared only when neither the release nor the wait callback is implemented and this isn't true for a lot of dma_fence implementations yet. So those implementations lost the RCU protection after signaling of the returned string resulting in potential use after free. Add the signaling check additional to the ops pointer check so that we have both the protection against NULL dereference as well as the RCU protection after signaling for the returned string. v2: improve comments to note RCU protection and explain why we check both signaling state and ops pointer v3: some comment improvements suggested by Philip
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/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 035219a760edb35ae9a9e96beba7f122e26a997b ~ a4db25b8949d6ff9c1a685a1273a015e8bab29db -
Linux Linux 7.2 -

II. Public POCs for CVE-2026-98243

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III. Intelligence Information for CVE-2026-98243

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Patches & Fixes for CVE-2026-98243 (2)

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-2026-98320 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
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-2026-98243

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