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CVE-2024-42233— filemap: replace pte_offset_map() with pte_offset_map_nolock()

EPSS 0.03% · P8
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I. Basic Information for CVE-2024-42233

Vulnerability Information
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Vulnerability Title
filemap: replace pte_offset_map() with pte_offset_map_nolock()
Source: NVD (National Vulnerability Database)
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: filemap: replace pte_offset_map() with pte_offset_map_nolock() The vmf->ptl in filemap_fault_recheck_pte_none() is still set from handle_pte_fault(). But at the same time, we did a pte_unmap(vmf->pte). After a pte_unmap(vmf->pte) unmap and rcu_read_unlock(), the page table may be racily changed and vmf->ptl maybe fails to protect the actual page table. Fix this by replacing pte_offset_map() with pte_offset_map_nolock(). As David said, the PTL pointer might be stale so if we continue to use it infilemap_fault_recheck_pte_none(), it might trigger UAF. Also, if the PTL fails, the issue fixed by commit 58f327f2ce80 ("filemap: avoid unnecessary major faults in filemap_fault()") might reappear.
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 filemap 模块在filemap_fault_recheck_pte_none中使用pte_offset_map可能导致使用已失效的PTL指针，从而触发释放后重用。
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 58f327f2ce80f9c7b4a70e9cf017ae8810d44a20 ~ 6a6c2aec1a89506595801b4cf7e8eef035f33748 -
LinuxLinux 6.9 -

II. Public POCs for CVE-2024-42233

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III. Intelligence Information for CVE-2024-42233

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Same Patch Batch · Linux · 2024-08-07 · 19 CVEs total

CVE-2024-42242mmc: sdhci: Fix max_seg_size for 64KiB PAGE_SIZE
CVE-2024-42232libceph: fix race between delayed_work() and ceph_monc_stop()
CVE-2024-42234mm: fix crashes from deferred split racing folio migration
CVE-2024-42235s390/mm: Add NULL pointer check to crst_table_free() base_crst_free()
CVE-2024-42236usb: gadget: configfs: Prevent OOB read/write in usb_string_copy()
CVE-2024-42237firmware: cs_dsp: Validate payload length before processing block
CVE-2024-42238firmware: cs_dsp: Return error if block header overflows file
CVE-2024-42239bpf: Fail bpf_timer_cancel when callback is being cancelled
CVE-2024-42240x86/bhi: Avoid warning in #DB handler due to BHI mitigation
CVE-2024-42250cachefiles: add missing lock protection when polling
CVE-2024-42241mm/shmem: disable PMD-sized page cache if needed
CVE-2024-42244USB: serial: mos7840: fix crash on resume
CVE-2024-42243mm/filemap: make MAX_PAGECACHE_ORDER acceptable to xarray
CVE-2024-42245Revert "sched/fair: Make sure to try to detach at least one movable task"
CVE-2024-42246net, sunrpc: Remap EPERM in case of connection failure in xs_tcp_setup_socket
CVE-2024-42247wireguard: allowedips: avoid unaligned 64-bit memory accesses
CVE-2024-42249spi: don't unoptimize message in spi_async()
CVE-2024-42248tty: serial: ma35d1: Add a NULL check for of_node

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2024-42233

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