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CVE-2021-46971— perf/core: Fix unconditional security_locked_down() call

EPSS 0.02% · P5
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I. Basic Information for CVE-2021-46971

Vulnerability Information
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Vulnerability Title
perf/core: Fix unconditional security_locked_down() call
Source: NVD (National Vulnerability Database)
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: perf/core: Fix unconditional security_locked_down() call Currently, the lockdown state is queried unconditionally, even though its result is used only if the PERF_SAMPLE_REGS_INTR bit is set in attr.sample_type. While that doesn't matter in case of the Lockdown LSM, it causes trouble with the SELinux's lockdown hook implementation. SELinux implements the locked_down hook with a check whether the current task's type has the corresponding "lockdown" class permission ("integrity" or "confidentiality") allowed in the policy. This means that calling the hook when the access control decision would be ignored generates a bogus permission check and audit record. Fix this by checking sample_type first and only calling the hook when its result would be honored.
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，该漏洞源于锁定状态是无条件查询的，即使只有在 attr.sample_type 中设置了 PERF_SAMPLE_REGS_INTR 位时才使用其结果。
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 b0c8fdc7fdb77586c3d1937050925b960743306e ~ b246759284d6a2bc5b6f1009caeeb3abce2ec9ff -
LinuxLinux 5.4 -

II. Public POCs for CVE-2021-46971

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III. Intelligence Information for CVE-2021-46971

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Same Patch Batch · Linux · 2024-02-27 · 67 CVEs total

CVE-2021-46950md/raid1: properly indicate failure when ending a failed write request
CVE-2021-46970bus: mhi: pci_generic: Remove WQ_MEM_RECLAIM flag from state workqueue
CVE-2021-46969bus: mhi: core: Fix invalid error returning in mhi_queue
CVE-2021-46968s390/zcrypt: fix zcard and zqueue hot-unplug memleak
CVE-2021-46956virtiofs: fix memory leak in virtio_fs_probe()
CVE-2021-46955openvswitch: fix stack OOB read while fragmenting IPv4 packets
CVE-2021-46954net/sched: sch_frag: fix stack OOB read while fragmenting IPv4 packets
CVE-2021-46953ACPI: GTDT: Don't corrupt interrupt mappings on watchdow probe failure
CVE-2021-46952NFS: fs_context: validate UDP retrans to prevent shift out-of-bounds
CVE-2021-46951tpm: efi: Use local variable for calculating final log size
CVE-2021-46957riscv/kprobe: fix kernel panic when invoking sys_read traced by kprobe
CVE-2021-46949sfc: farch: fix TX queue lookup in TX flush done handling
CVE-2021-46948sfc: farch: fix TX queue lookup in TX event handling
CVE-2021-46947sfc: adjust efx->xdp_tx_queue_count with the real number of initialized queues
CVE-2021-46945ext4: always panic when errors=panic is specified
CVE-2021-46944media: staging/intel-ipu3: Fix memory leak in imu_fmt
CVE-2021-46943media: staging/intel-ipu3: Fix set_fmt error handling
CVE-2021-46942io_uring: fix shared sqpoll cancellation hangs
CVE-2021-46941usb: dwc3: core: Do core softreset when switch mode
CVE-2021-46940tools/power turbostat: Fix offset overflow issue in index converting

Showing top 20 of 67 CVEs. View all on vendor page → →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2021-46971

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