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

AI Predicted 5.5 Difficulty: Moderate EPSS 0.15% · P5

Affected Version Matrix 6

VendorProductVersion RangeStatus
LinuxLinuxc56d1b62cce83695823c13e52f73e92eb568c0c1< 2d11727655bf931776fb541f5862daf04bd5bf02affected
c56d1b62cce83695823c13e52f73e92eb568c0c1< 49d6d7fb631345b0f2957a7c4be24ad63903150faffected
5.19affected
< 5.19unaffected
6.1.11≤ 6.1.*unaffected
6.2≤ *unaffected
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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: CVE Program / CVE List V5
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: 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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Patches & Fixes for CVE-2022-49744 (1)

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

CVE-2023-530069.8 CRITICALcifs: Fix oops due to uncleared server->smbd_conn in reconnect
CVE-2025-218768.8 HIGHiommu/vt-d: Fix suspicious RCU usage
CVE-2025-218908.2 HIGHidpf: fix checksums set in idpf_rx_rsc()
CVE-2025-218877.8 HIGHovl: fix UAF in ovl_dentry_update_reval by moving dput() in ovl_link_up
CVE-2023-530337.8 HIGHnetfilter: nft_payload: incorrect arithmetics when fetching VLAN header bits
CVE-2025-218897.8 HIGHperf/core: Add RCU read lock protection to perf_iterate_ctx()
CVE-2023-529307.8 HIGHdrm/i915: Fix potential bit_17 double-free
CVE-2023-529317.8 HIGHdrm/i915: Avoid potential vm use-after-free
CVE-2023-529347.8 HIGHmm/MADV_COLLAPSE: catch !none !huge !bad pmd lookups
CVE-2023-529357.8 HIGHmm/khugepaged: fix ->anon_vma race
CVE-2023-530097.8 HIGHdrm/amdkfd: Add sync after creating vram bo
CVE-2023-529997.8 HIGHnet: fix UaF in netns ops registration error path
CVE-2023-529737.8 HIGHvc_screen: move load of struct vc_data pointer in vcs_read() to avoid UAF
CVE-2023-529837.8 HIGHblock, bfq: fix uaf for bfqq in bic_set_bfqq()
CVE-2023-529817.8 HIGHdrm/i915: Fix request ref counting during error capture & debugfs dump
CVE-2023-529757.8 HIGHscsi: iscsi_tcp: Fix UAF during logout when accessing the shost ipaddress
CVE-2023-529747.8 HIGHscsi: iscsi_tcp: Fix UAF during login when accessing the shost ipaddress
CVE-2022-497607.8 HIGHmm/hugetlb: fix PTE marker handling in hugetlb_change_protection()
CVE-2025-218677.8 HIGHbpf, test_run: Fix use-after-free issue in eth_skb_pkt_type()
CVE-2023-529887.8 HIGHALSA: hda/via: Avoid potential array out-of-bound in add_secret_dac_path()

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

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2022-49744

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