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CVE-2026-23067— iommu/io-pgtable-arm: fix size_t signedness bug in unmap path

EPSS 0.02% · P5
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I. Basic Information for CVE-2026-23067

Vulnerability Information
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Vulnerability Title
iommu/io-pgtable-arm: fix size_t signedness bug in unmap path
Source: NVD (National Vulnerability Database)
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: iommu/io-pgtable-arm: fix size_t signedness bug in unmap path __arm_lpae_unmap() returns size_t but was returning -ENOENT (negative error code) when encountering an unmapped PTE. Since size_t is unsigned, -ENOENT (typically -2) becomes a huge positive value (0xFFFFFFFFFFFFFFFE on 64-bit systems). This corrupted value propagates through the call chain: __arm_lpae_unmap() returns -ENOENT as size_t -> arm_lpae_unmap_pages() returns it -> __iommu_unmap() adds it to iova address -> iommu_pgsize() triggers BUG_ON due to corrupted iova This can cause IOVA address overflow in __iommu_unmap() loop and trigger BUG_ON in iommu_pgsize() from invalid address alignment. Fix by returning 0 instead of -ENOENT. The WARN_ON already signals the error condition, and returning 0 (meaning "nothing unmapped") is the correct semantic for size_t return type. This matches the behavior of other io-pgtable implementations (io-pgtable-arm-v7s, io-pgtable-dart) which return 0 on error conditions.
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，该漏洞源于返回类型错误，可能导致地址溢出。
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 3318f7b5cefbff96b1bb49584ac38d2c9997a830 ~ 41ec6988547819756fb65e94fc24f3e0dddf84ac -
LinuxLinux 6.16 -

II. Public POCs for CVE-2026-23067

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III. Intelligence Information for CVE-2026-23067

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Same Patch Batch · Linux · 2026-02-04 · 79 CVEs total

CVE-2026-230988.8 HIGHnetrom: fix double-free in nr_route_frame()
CVE-2026-230777.8 HIGHmm/vma: fix anon_vma UAF on mremap() faulted, unfaulted merge
CVE-2026-230747.8 HIGHnet/sched: Enforce that teql can only be used as root qdisc
CVE-2026-231037.8 HIGHipvlan: Make the addrs_lock be per port
CVE-2026-230667.8 HIGHrxrpc: Fix recvmsg() unconditional requeue
CVE-2026-231057.8 HIGHnet/sched: qfq: Use cl_is_active to determine whether class is active in qfq_rm_from_ag
CVE-2026-230957.5 HIGHgue: Fix skb memleak with inner IP protocol 0.
CVE-2026-23065platform/x86/amd: Fix memory leak in wbrf_record()
CVE-2026-23064net/sched: act_ife: avoid possible NULL deref
CVE-2026-23063uacce: ensure safe queue release with state management
CVE-2026-23062platform/x86: hp-bioscfg: Fix kernel panic in GET_INSTANCE_ID macro
CVE-2026-23061can: kvaser_usb: kvaser_usb_read_bulk_callback(): fix URB memory leak
CVE-2026-23057vsock/virtio: Coalesce only linear skb
CVE-2026-23056uacce: implement mremap in uacce_vm_ops to return -EPERM
CVE-2025-71199iio: adc: at91-sama5d2_adc: Fix potential use-after-free in sama5d2_adc driver
CVE-2025-71198iio: imu: st_lsm6dsx: fix iio_chan_spec for sensors without event detection
CVE-2025-71197w1: therm: Fix off-by-one buffer overflow in alarms_store
CVE-2026-23055i2c: riic: Move suspend handling to NOIRQ phase
CVE-2026-23053NFS: Fix a deadlock involving nfs_release_folio()
CVE-2026-23058can: ems_usb: ems_usb_read_bulk_callback(): fix URB memory leak

Showing top 20 of 79 CVEs. View all on vendor page → →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-23067

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