CVE-2026-98309— drm/vc4: Use managed KMS polling to fix UAF on unbind
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： drm/vc4：使用托管的 KMS 轮询机制，修复解绑时的 UAF（使用已释放内存）漏洞 函数调用了 ，但该驱动未提供匹配的 函数。因此，在设备解绑后，输出轮询工作（output poll work）仍被调度并在已释放的 结构上执行： 改用 可确保在设备销毁时同步完成轮询机制的清理工作，与其他驱动的行为保持一致。
Possible ATT&CK Techniques 1 AI
T1059 · Command and Scripting InterpreterAffected Version Matrix 12
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| Linux | Linux | c8b75bca92cbf064b9fa125fc74a85994452e935< b6beee927e7f4e3142032ff91b2d0417cdddc0f6 |
affected |
c8b75bca92cbf064b9fa125fc74a85994452e935< cf0c4432bda37b02e7d430ff5017228ceb7caf0c |
affected | ||
c8b75bca92cbf064b9fa125fc74a85994452e935< ee507691c18f9fee5d4751e295ab9a7ff31d59ae |
affected | ||
c8b75bca92cbf064b9fa125fc74a85994452e935< 7f9780df677370a19b4ec9764f13b1b82073e0d9 |
affected | ||
c8b75bca92cbf064b9fa125fc74a85994452e935< 073a30d75f309812ed61af134f24ffef4107b13a |
affected | ||
4.4 |
affected | ||
< 4.4 |
unaffected | ||
6.6.158≤ 6.6.* |
unaffected | ||
| … +4 more rows | |||
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I. Basic Information for CVE-2026-98309
Vulnerability Information
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Vulnerability Title
drm/vc4: Use managed KMS polling to fix UAF on unbind
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved:
drm/vc4: Use managed KMS polling to fix UAF on unbind
vc4_kms_load() calls drm_kms_helper_poll_init() but the driver provides
no matching drm_kms_helper_poll_fini(). The output poll work stays
scheduled after unbind and runs on the freed drm_device:
# modprobe vc4; rmmod vc4; sleep 10
BUG: KASAN: slab-use-after-free in delayed_work_timer_fn
BUG: KASAN: slab-use-after-free in drm_client_dev_hotplug [drm]
Workqueue: events output_poll_execute [drm_kms_helper]
Allocated by task 171: __devm_drm_dev_alloc
Freed by task 262 (rmmod): drm_dev_put / component_del
Use drmm_kms_helper_poll_init() so polling is finalized with the device,
as other drivers do.
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
II. Public POCs for CVE-2026-98309
| # | POC Description | Source Link | Shenlong Link |
|---|
AI-Generated POC
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Patches & Fixes for CVE-2026-98309 (5)
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-2026-98305 | 7.8 HIGH | net: dsa: mxl862xx: disable the stats poll on teardown |
| CVE-2026-98341 | 7.8 HIGH | wifi: cfg80211: don't free driver-owned scan requests |
| 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 → →
IV. Related Vulnerabilities
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CVE-2026-98381
veth: manage XDP program pointers during channel resize -
CVE-2026-98380
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Same vendor: Linux
-
CVE-2026-98384
bpf: Fix out-of-bounds read of sk_protocol in bpf_sock_destr -
CVE-2026-98383
bpf: Disallow bpf_skb_pull_data() for LWT_SEG6LOCAL -
CVE-2026-98382
bpf: Reject dev-bound-only programs on other devices -
CVE-2026-98381
veth: manage XDP program pointers during channel resize -
CVE-2026-98380
net/sched: reject IDR error pointers when deleting actions
V. Comments for CVE-2026-98309
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