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CVE-2022-49744— mm/uffd: fix pte marker when fork() without fork event

EPSS 0.04% · P13
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I. Basic Information for CVE-2022-49744

Vulnerability Information
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Vulnerability Title
mm/uffd: fix pte marker when fork() without fork event
Source: NVD (National Vulnerability Database)
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: mm/uffd: fix pte marker when fork() without fork event Patch series "mm: Fixes on pte markers". Patch 1 resolves the syzkiller report from Pengfei. Patch 2 further harden pte markers when used with the recent swapin error markers. The major case is we should persist a swapin error marker after fork(), so child shouldn't read a corrupted page. This patch (of 2): When fork(), dst_vma is not guaranteed to have VM_UFFD_WP even if src may have it and has pte marker installed. The warning is improper along with the comment. The right thing is to inherit the pte marker when needed, or keep the dst pte empty. A vague guess is this happened by an accident when there's the prior patch to introduce src/dst vma into this helper during the uffd-wp feature got developed and I probably messed up in the rebase, since if we replace dst_vma with src_vma the warning & comment it all makes sense too. Hugetlb did exactly the right here (copy_hugetlb_page_range()). Fix the general path. Reproducer: https://github.com/xupengfe/syzkaller_logs/blob/main/221208_115556_copy_page_range/repro.c Bugzilla report: https://bugzilla.kernel.org/show_bug.cgi?id=216808
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fork时未正确处理pte标记。
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 c56d1b62cce83695823c13e52f73e92eb568c0c1 ~ 2d11727655bf931776fb541f5862daf04bd5bf02 -
LinuxLinux 5.19 -

II. Public POCs for CVE-2022-49744

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III. Intelligence Information for CVE-2022-49744

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Same Patch Batch · Linux · 2025-03-27 · 124 CVEs total

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CVE-2023-52992bpf: Skip task with pid=1 in send_signal_common()
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CVE-2023-52988ALSA: hda/via: Avoid potential array out-of-bound in add_secret_dac_path()
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CVE-2023-52986bpf, sockmap: Check for any of tcp_bpf_prots when cloning a listener
CVE-2023-52985arm64: dts: imx8mm-verdin: Do not power down eth-phy
CVE-2023-52984net: phy: dp83822: Fix null pointer access on DP83825/DP83826 devices
CVE-2023-52973vc_screen: move load of struct vc_data pointer in vcs_read() to avoid UAF
CVE-2022-49761btrfs: always report error in run_one_delayed_ref()
CVE-2022-49760mm/hugetlb: fix PTE marker handling in hugetlb_change_protection()
CVE-2023-52974scsi: iscsi_tcp: Fix UAF during login when accessing the shost ipaddress

Showing top 20 of 124 CVEs. View all on vendor page → →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2022-49744

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