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CVE-2026-64300— perf/aux: Fix page UAF in map_range()

CVSS 7.8 · High EPSS 0.16% · P6

Affected Version Matrix 8

VendorProductVersion RangeStatus
LinuxLinuxb709eb872e19a19607bbb6d2975bc264d59735cf< c8b7e113f7b61eef2f017e6329c27c2331058c5aaffected
b709eb872e19a19607bbb6d2975bc264d59735cf< 0cff05bd2186020f8706233e261016d149cc24dbaffected
b709eb872e19a19607bbb6d2975bc264d59735cf< 5948aaf64f81f217a25dcc2bf6c0779bca19566caffected
6.14affected
< 6.14unaffected
6.18.39≤ 6.18.*unaffected
7.1.4≤ 7.1.*unaffected
7.2-rc3≤ *unaffected
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I. Basic Information for CVE-2026-64300

Vulnerability Information
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Vulnerability Title
perf/aux: Fix page UAF in map_range()
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: perf/aux: Fix page UAF in map_range() map_range() reads rb->aux_pages[], rb->aux_nr_pages and rb->aux_pgoff via perf_mmap_to_page() while holding only event->mmap_mutex. Those fields are serialized by rb->aux_mutex, and mmap_mutex is per event. Thus, two events sharing one rb via PERF_EVENT_IOC_SET_OUTPUT can race rb_alloc_aux() with map_range(), leading to a page-UAF scenario as follows: CPU 0 CPU 1 ===== ===== rb_alloc_aux() map_range() [1]: allocate rb->aux_pages[0] [2]: rb->aux_nr_pages++ [3]: perf_mmap_to_page() returns rb->aux_pages[0] [4]: map it as VM_PFNMAP [5]: rb->aux_pgoff = 1 munmap the page [6]: free rb->aux_pages[0] Pages mapped as VM_PFNMAP have no refcount protection, so CPU 1 holds a mapping to a freed physical frame. Fix this by taking rb->aux_mutex across the page walk in map_range().
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
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基金会开源的一款操作系统内核。 Linux kernel 6.14版本存在安全漏洞，该漏洞源于map_range()函数在访问rb->aux_pages等字段时未正确锁定rb->aux_mutex，导致竞争条件，进而引发页面释放后重用。
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 b709eb872e19a19607bbb6d2975bc264d59735cf ~ c8b7e113f7b61eef2f017e6329c27c2331058c5a -
LinuxLinux 6.14 -

II. Public POCs for CVE-2026-64300

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III. Intelligence Information for CVE-2026-64300

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Patches & Fixes for CVE-2026-64300 (3)

Same Patch Batch · Linux · 2026-07-25 · 274 CVEs total

CVE-2026-643559.8 CRITICALbpf: Reject fragmented frames in devmap
CVE-2026-644599.8 CRITICALtcp: restore RCU grace period in tcp_ao_destroy_sock
CVE-2026-643039.8 CRITICALspi: fsl-lpspi: terminate the RX channel on TX prepare failure path
CVE-2026-644399.8 CRITICALcrypto: krb5 - filter out async aead implementations at alloc
CVE-2026-644109.8 CRITICALnetfilter: flowtable: IPIP tunnel hardware offload is not yet support
CVE-2026-643999.8 CRITICALksmbd: add permission checks for FSCTL_DUPLICATE_EXTENTS_TO_FILE
CVE-2026-643979.8 CRITICALksmbd: serialize QUERY_DIRECTORY requests per file
CVE-2026-643919.8 CRITICALksmbd: use opener credentials for ADS I/O
CVE-2026-643879.8 CRITICALsmb: client: fix query directory replay double-free
CVE-2026-643869.8 CRITICALsmb: client: fix query_info() replay double-free
CVE-2026-643859.8 CRITICALsmb: client: fix double-free in SMB2_ioctl() replay
CVE-2026-643839.8 CRITICALsmb: client: fix double-free in SMB2_flush() replay
CVE-2026-643849.8 CRITICALsmb: client: fix change notify replay double-free
CVE-2026-642689.8 CRITICALRDMA/siw: bound Read Response placement to the RREAD length
CVE-2026-645239.8 CRITICALnet/handshake: Take a long-lived file reference at submit
CVE-2026-642579.1 CRITICALsmb: client: reject overlapping data areas in SMB2 responses
CVE-2026-643929.1 CRITICALksmbd: use opener credentials for delete-on-close
CVE-2026-643939.1 CRITICALksmbd: run set info with opener credentials
CVE-2026-642699.1 CRITICALRDMA/rtrs-srv: Bound RDMA-Write length to chunk size in rdma_write_sg
CVE-2026-643199.1 CRITICALnvmet-auth: validate reply message payload bounds against transfer length

Showing top 20 of 274 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-64300

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