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CVE-2026-98248— arm64: percpu: Fix LSE operations on {8,16}-bit types

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： arm64: percpu: 修复针对 8 位和 16 位类型的 LSE 原子操作问题 和 的汇编代码未使用 宏参数来构造 LSE 指令。缺少 后缀时，W 寄存器参数将被隐式解释为 32 位内存访问，从而导致在使用 LSE 指令时，原本应操作 8 位或 16 位数据的操作错误地读取和写入 32 位内存。 修复方法是在 LSE 指令的 后附加 后缀。对于 则无需（且无效）附加 ，因为 是寄存器到寄存器的操作，不直接访问内存，因此也不支持大小后缀。

AI Predicted 4.3 Difficulty: Moderate EPSS 0.20% · P9

Possible ATT&CK Techniques 1 AI

T1620 · Reflective Code Loading

Affected Version Matrix 10

VendorProduct Version RangeStatus
Linux Linux 959bf2fd03b59fc107584c21425f3dc73c49f762< d69ab4480e49bf925f4781afcc9f284affcb96b6 affected
959bf2fd03b59fc107584c21425f3dc73c49f762< 390742871a723b52de9b92a94c0d1c85a2531e3e affected
959bf2fd03b59fc107584c21425f3dc73c49f762< 843ace1d0a39e9b1cfcbfb3856a7b0fbdd9cd003 affected
959bf2fd03b59fc107584c21425f3dc73c49f762< 8cf2093f5372952a9ebc805c418d45df7112cd14 affected
5.0 affected
< 5.0 unaffected
6.12.112≤ 6.12.* unaffected
6.18.54≤ 6.18.* unaffected
… +2 more rows
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I. Basic Information for CVE-2026-98248

Vulnerability Information
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Vulnerability Title
arm64: percpu: Fix LSE operations on {8,16}-bit types
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: arm64: percpu: Fix LSE operations on {8,16}-bit types The assembly for __percpu_##name##_case_##sz() and __percpu_##name##_return_case_##sz() doesn't use the 'sfx' macro argument to form the LSE instruction. Without 'sfx', a W register argument will imply a 32-bit memory location, and consequently {8,16}-bit ops will erroneously read and write 32 bits of memory when the LSE instruction is used. Fix this by appending 'sfx' to 'op_lse' to LSE instruction. It is not necessary (and not valid) to append 'sfx' to 'op_llsc', as 'op_llsc' is a register-register operation which does not access memory (and does not take a size suffix).
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

Vendor Product Affected Versions CPE Subscribe
Linux Linux 959bf2fd03b59fc107584c21425f3dc73c49f762 ~ d69ab4480e49bf925f4781afcc9f284affcb96b6 -
Linux Linux 5.0 -

II. Public POCs for CVE-2026-98248

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III. Intelligence Information for CVE-2026-98248

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Patches & Fixes for CVE-2026-98248 (4)

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

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