Goal Reached Thanks to every supporter — we hit 100%!

Goal: 1000 CNY · Raised: 1000 CNY

100.0%
Buy Us a Coffee

CVE-2026-43486— arm64: contpte: fix set_access_flags() no-op check for SMMU/ATS faults

AI Predicted 5.3 Difficulty: Hard EPSS 0.02% · P5

Possible ATT&CK Techniques 1AI

T1059 · Command and Scripting Interpreter

Affected Version Matrix 10

VendorProductVersion RangeStatus
LinuxLinux4602e5757bcceb231c3a13c36c373ad4a750eddb< 05d239f2c95e66e27e7fb4e99ee07eb56e3e34b0affected
4602e5757bcceb231c3a13c36c373ad4a750eddb< 6f92a7a8b48a523f910ef25dd83808710724f59baffected
4602e5757bcceb231c3a13c36c373ad4a750eddb< 09d620555e59768776090073a2c59d2bc8506eb3affected
4602e5757bcceb231c3a13c36c373ad4a750eddb< 97c5550b763171dbef61e6239cab372b9f9cd4a2affected
6.9affected
< 6.9unaffected
6.12.78≤ 6.12.*unaffected
6.18.19≤ 6.18.*unaffected
… +2 more rows
Get alerts for future matching vulnerabilitiesLog in to subscribe

I. Basic Information for CVE-2026-43486

Vulnerability Information
Have questions about the vulnerability? See if Shenlong's analysis helps!
View Shenlong Deep Dive ↗

Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.

Vulnerability Title
arm64: contpte: fix set_access_flags() no-op check for SMMU/ATS faults
Source: NVD (National Vulnerability Database)
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: arm64: contpte: fix set_access_flags() no-op check for SMMU/ATS faults contpte_ptep_set_access_flags() compared the gathered ptep_get() value against the requested entry to detect no-ops. ptep_get() ORs AF/dirty from all sub-PTEs in the CONT block, so a dirty sibling can make the target appear already-dirty. When the gathered value matches entry, the function returns 0 even though the target sub-PTE still has PTE_RDONLY set in hardware. For a CPU with FEAT_HAFDBS this gathered view is fine, since hardware may set AF/dirty on any sub-PTE and CPU TLB behavior is effectively gathered across the CONT range. But page-table walkers that evaluate each descriptor individually (e.g. a CPU without DBM support, or an SMMU without HTTU, or with HA/HD disabled in CD.TCR) can keep faulting on the unchanged target sub-PTE, causing an infinite fault loop. Gathering can therefore cause false no-ops when only a sibling has been updated: - write faults: target still has PTE_RDONLY (needs PTE_RDONLY cleared) - read faults: target still lacks PTE_AF Fix by checking each sub-PTE against the requested AF/dirty/write state (the same bits consumed by __ptep_set_access_flags()), using raw per-PTE values rather than the gathered ptep_get() view, before returning no-op. Keep using the raw target PTE for the write-bit unfold decision. Per Arm ARM (DDI 0487) D8.7.1 ("The Contiguous bit"), any sub-PTE in a CONT range may become the effective cached translation and software must maintain consistent attributes across the range.
Source: NVD (National Vulnerability Database)
CVSS Information
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Type
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于contpte_ptep_set_access_flags函数在检测无操作时使用聚合值，可能导致SMMU或ATS故障时无限循环。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

VendorProductAffected VersionsCPESubscribe
LinuxLinux 4602e5757bcceb231c3a13c36c373ad4a750eddb ~ 05d239f2c95e66e27e7fb4e99ee07eb56e3e34b0 -
LinuxLinux 6.9 -

II. Public POCs for CVE-2026-43486

#POC DescriptionSource LinkShenlong Link
AI-Generated POCPremium

No public POC found.

Login to generate AI POC

III. Intelligence Information for CVE-2026-43486

请登录查看更多情报信息。

Same Patch Batch · Linux · 2026-05-13 · 14 CVEs total

CVE-2026-43489liveupdate: luo_file: remember retrieve() status
CVE-2026-43487ata: libata-core: Disable LPM on ST1000DM010-2EP102
CVE-2026-43488usb: xhci: Prevent interrupt storm on host controller error (HCE)
CVE-2026-43485nouveau/gsp: drop WARN_ON in ACPI probes
CVE-2026-43484mmc: core: Avoid bitfield RMW for claim/retune flags
CVE-2026-43482sched_ext: Disable preemption between scx_claim_exit() and kicking helper work
CVE-2026-43483KVM: SVM: Set/clear CR8 write interception when AVIC is (de)activated
CVE-2026-43480ASoC: amd: acp3x-rt5682-max9836: Add missing error check for clock acquisition
CVE-2026-43481net-shapers: don't free reply skb after genlmsg_reply()
CVE-2026-43479net: usb: lan78xx: fix WARN in __netif_napi_del_locked on disconnect
CVE-2026-43477drm/i915/vrr: Configure VRR timings after enabling TRANS_DDI_FUNC_CTL
CVE-2026-43478ASoC: codecs: rt1011: Use component to get the dapm context in spk_mode_put
CVE-2026-43476iio: chemical: sps30_i2c: fix buffer size in sps30_i2c_read_meas()

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-43486

No comments yet

Leave a comment