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CVE-2026-43484— mmc: core: Avoid bitfield RMW for claim/retune flags

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.

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claimed和retune控制标志共享位域字，可能导致异步环境中的非预期读写修改操作，触发虚假警告。

AI Predicted 5.5 Difficulty: Hard EPSS 0.16% · P5

Possible ATT&CK Techniques 1 AI

T1564.004 · NTFS File Attributes

Affected Version Matrix 16

VendorProduct Version RangeStatus
Linux Linux 6c0cedd1ef9527ef13e66875746570e76a3188a7< 41dce4dae583a8ce06a7ebf4ce704c46a142957c affected
6c0cedd1ef9527ef13e66875746570e76a3188a7< bb7fc2498c3bb25fa6a91f22f4760005325cfbd5 affected
6c0cedd1ef9527ef13e66875746570e76a3188a7< 270277c2ab631044867adb1bd2f2433d3892de6e affected
6c0cedd1ef9527ef13e66875746570e76a3188a7< 45038e03f15e992c48603fff8c6b1c9be5397ac9 affected
6c0cedd1ef9527ef13e66875746570e76a3188a7< 0e06cc511c61cff1591e5435a207759adcc76b6d affected
6c0cedd1ef9527ef13e66875746570e76a3188a7< d3a3caf44c8ec26f5d63dc17c1c7242effa60ebc affected
6c0cedd1ef9527ef13e66875746570e76a3188a7< 901084c51a0a8fb42a3f37d2e9c62083c495f824 affected
4.15 affected
… +8 more rows
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I. Basic Information for CVE-2026-43484

Vulnerability Information
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Vulnerability Title
mmc: core: Avoid bitfield RMW for claim/retune flags
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: mmc: core: Avoid bitfield RMW for claim/retune flags Move claimed and retune control flags out of the bitfield word to avoid unrelated RMW side effects in asynchronous contexts. The host->claimed bit shared a word with retune flags. Writes to claimed in __mmc_claim_host() or retune_now in mmc_mq_queue_rq() can overwrite other bits when concurrent updates happen in other contexts, triggering spurious WARN_ON(!host->claimed). Convert claimed, can_retune, retune_now and retune_paused to bool to remove shared-word coupling.
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
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claimed和retune控制标志共享位域字，可能导致异步环境中的非预期读写修改操作，触发虚假警告。
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

Vendor Product Affected Versions CPE Subscribe
Linux Linux 6c0cedd1ef9527ef13e66875746570e76a3188a7 ~ 41dce4dae583a8ce06a7ebf4ce704c46a142957c -
Linux Linux 4.15 -

II. Public POCs for CVE-2026-43484

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III. Intelligence Information for CVE-2026-43484

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Patches & Fixes for CVE-2026-43484 (7)

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

CVE-2026-43481 7.8 HIGH net-shapers: don't free reply skb after genlmsg_reply()
CVE-2026-43476 7.8 HIGH iio: chemical: sps30_i2c: fix buffer size in sps30_i2c_read_meas()
CVE-2026-43489 liveupdate: luo_file: remember retrieve() status
CVE-2026-43487 ata: libata-core: Disable LPM on ST1000DM010-2EP102
CVE-2026-43488 usb: xhci: Prevent interrupt storm on host controller error (HCE)
CVE-2026-43485 nouveau/gsp: drop WARN_ON in ACPI probes
CVE-2026-43486 arm64: contpte: fix set_access_flags() no-op check for SMMU/ATS faults
CVE-2026-43482 sched_ext: Disable preemption between scx_claim_exit() and kicking helper work
CVE-2026-43483 KVM: SVM: Set/clear CR8 write interception when AVIC is (de)activated
CVE-2026-43480 ASoC: amd: acp3x-rt5682-max9836: Add missing error check for clock acquisition
CVE-2026-43479 net: usb: lan78xx: fix WARN in __netif_napi_del_locked on disconnect
CVE-2026-43477 drm/i915/vrr: Configure VRR timings after enabling TRANS_DDI_FUNC_CTL
CVE-2026-43478 ASoC: codecs: rt1011: Use component to get the dapm context in spk_mode_put

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-43484

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