CVE-2026-98196— wifi: brcmsmac: fix UAF in brcms_free_timer()
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： wifi: brcmsmac：修复 brcms_free_timer() 中的 Use-After-Free (UAF) 漏洞 函数会调用 ，后者使用非同步函数 来取消定时器所关联的延迟工作项。如果该工作的回调函数（ ）已经正在执行， 会立即返回 ，而不会等待回调执行完毕。此时， 会继续执行 释放内存，但回调函数仍可能通过 访问已被释放的结构体 ，从而导致 Use-After-Free（UAF）漏洞。 为此，在 之后显式调用 ，以确保在释放定时器结构体之前，所有正在执行的回
Possible ATT&CK Techniques 2 AI
T1190 · Exploit Public-Facing Application T1068 · Exploitation for Privilege EscalationAffected Version Matrix 18
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| Linux | Linux | 5b435de0d786869c95d1962121af0d7df2542009< 10eeb0b29fd7f52487c9ae573e8d79c210a0095d |
affected |
5b435de0d786869c95d1962121af0d7df2542009< 74acccc928851f69184271832d690607877122af |
affected | ||
5b435de0d786869c95d1962121af0d7df2542009< 050d2486e8ed2c0a23b87249ccd23e8072721391 |
affected | ||
5b435de0d786869c95d1962121af0d7df2542009< 856dabd5f2617efb23c043be9e1b22a9e6e97c41 |
affected | ||
5b435de0d786869c95d1962121af0d7df2542009< 2a4841ff0b74b495cddd31ae324e922217fc2f13 |
affected | ||
5b435de0d786869c95d1962121af0d7df2542009< 1edb3ddd261e973a4d577c0547e63bfa25a8170d |
affected | ||
5b435de0d786869c95d1962121af0d7df2542009< 777cb6bba59e875b16a1d8897a483a5fecfcd5d2 |
affected | ||
5b435de0d786869c95d1962121af0d7df2542009< 1eeca1d5e0920fbdad6449768fd2d4364e714180 |
affected | ||
| … +10 more rows | |||
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I. Basic Information for CVE-2026-98196
Vulnerability Information
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Vulnerability Title
wifi: brcmsmac: fix UAF in brcms_free_timer()
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved:
wifi: brcmsmac: fix UAF in brcms_free_timer()
brcms_free_timer() calls brcms_del_timer() which uses the non-synchronous
cancel_delayed_work() to cancel the timer's underlying delayed work. If
the work callback (_brcms_timer) is already running, cancel_delayed_work()
returns false without waiting, and brcms_free_timer() proceeds to kfree(t)
while the callback still accesses t through container_of().
Add an explicit cancel_delayed_work_sync() after brcms_del_timer() to
guarantee that any in-flight callback has completed before the timer
structure is freed.
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-2026-98196
| # | POC Description | Source Link | Shenlong Link |
|---|
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Patches & Fixes for CVE-2026-98196 (8)
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-2026-98228 | 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-2026-98320 | 7.8 HIGH | netfilter: flowtable: hold reference on ct until flow is released |
| 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
Same product: 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
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-2026-98196
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