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CVE-2026-23056— uacce: implement mremap in uacce_vm_ops to return -EPERM

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，该漏洞源于未实现mremap操作，可能导致内存重复释放。

AI Predicted 4.9 Difficulty: Hard EPSS 0.21% · P10

Possible ATT&CK Techniques 1 AI

T1055 · Process Injection

Affected Version Matrix 16

VendorProduct Version RangeStatus
Linux Linux 015d239ac0142ad0e26567fd890ef8d171f13709< 78d99f062d42e3af2ca46bde1a8e46e0dfd372e3 affected
015d239ac0142ad0e26567fd890ef8d171f13709< ebfa85658a39b49ec3901ceea7535b73aa0429e6 affected
015d239ac0142ad0e26567fd890ef8d171f13709< 75b29bdc935ff93b8e8bf6f6b4d8a4810b26e06f affected
015d239ac0142ad0e26567fd890ef8d171f13709< 4c042bc71474dbe417c268f4bfb8ec196f802f07 affected
015d239ac0142ad0e26567fd890ef8d171f13709< a407ddd61b3e6afc5ccfcd1478797171cf5686ee affected
015d239ac0142ad0e26567fd890ef8d171f13709< ba29b59d124e725e0377f09b2044909c91d657a1 affected
015d239ac0142ad0e26567fd890ef8d171f13709< 02695347be532b628f22488300d40c4eba48b9b7 affected
5.7 affected
… +8 more rows
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I. Basic Information for CVE-2026-23056

Vulnerability Information
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Vulnerability Title
uacce: implement mremap in uacce_vm_ops to return -EPERM
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: uacce: implement mremap in uacce_vm_ops to return -EPERM The current uacce_vm_ops does not support the mremap operation of vm_operations_struct. Implement .mremap to return -EPERM to remind users. The reason we need to explicitly disable mremap is that when the driver does not implement .mremap, it uses the default mremap method. This could lead to a risk scenario: An application might first mmap address p1, then mremap to p2, followed by munmap(p1), and finally munmap(p2). Since the default mremap copies the original vma's vm_private_data (i.e., q) to the new vma, both munmap operations would trigger vma_close, causing q->qfr to be freed twice(qfr will be set to null here, so repeated release is ok).
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，该漏洞源于未实现mremap操作，可能导致内存重复释放。
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 015d239ac0142ad0e26567fd890ef8d171f13709 ~ 78d99f062d42e3af2ca46bde1a8e46e0dfd372e3 -
Linux Linux 5.7 -

II. Public POCs for CVE-2026-23056

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III. Intelligence Information for CVE-2026-23056

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

CVE-2026-23098 8.8 HIGH netrom: fix double-free in nr_route_frame()
CVE-2026-23066 7.8 HIGH rxrpc: Fix recvmsg() unconditional requeue
CVE-2026-23074 7.8 HIGH net/sched: Enforce that teql can only be used as root qdisc
CVE-2026-23077 7.8 HIGH mm/vma: fix anon_vma UAF on mremap() faulted, unfaulted merge
CVE-2026-23105 7.8 HIGH net/sched: qfq: Use cl_is_active to determine whether class is active in qfq_rm_from_ag
CVE-2026-23103 7.8 HIGH ipvlan: Make the addrs_lock be per port
CVE-2026-23095 7.5 HIGH gue: Fix skb memleak with inner IP protocol 0.
CVE-2025-71192 7.0 HIGH ALSA: ac97: fix a double free in snd_ac97_controller_register()
CVE-2026-23064 net/sched: act_ife: avoid possible NULL deref
CVE-2026-23065 platform/x86/amd: Fix memory leak in wbrf_record()
CVE-2026-23067 iommu/io-pgtable-arm: fix size_t signedness bug in unmap path
CVE-2026-23042 idpf: fix aux device unplugging when rdma is not supported by vport
CVE-2026-23060 crypto: authencesn - reject too-short AAD (assoclen<8) to match ESP/ESN spec
CVE-2026-23059 scsi: qla2xxx: Sanitize payload size to prevent member overflow
CVE-2026-23058 can: ems_usb: ems_usb_read_bulk_callback(): fix URB memory leak
CVE-2026-23057 vsock/virtio: Coalesce only linear skb
CVE-2025-71199 iio: adc: at91-sama5d2_adc: Fix potential use-after-free in sama5d2_adc driver
CVE-2025-71198 iio: imu: st_lsm6dsx: fix iio_chan_spec for sensors without event detection
CVE-2025-71197 w1: therm: Fix off-by-one buffer overflow in alarms_store
CVE-2026-23061 can: kvaser_usb: kvaser_usb_read_bulk_callback(): fix URB memory leak

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

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-23056

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