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CVE-2024-42250— cachefiles: add missing lock protection when polling

Quick assessment

Affected
Linux Linux
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

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 cachefiles 模块在轮询时缺少锁保护，需要添加自旋锁来保护xarray迭代。

CVSS 7.8 · High EPSS 0.17% · P7

Possible ATT&CK Techniques 1 AI

T1068 · Exploitation for Privilege Escalation

Affected Version Matrix 8

VendorProduct Version RangeStatus
Linux Linux 0e19a18f998dcabe8be590e0b39660a1f230209b< 97cfd5e20ddc2e33e16ce369626ce76c9a475fd7 affected
18943864342705fa18dd4e6b8d608491fec81f6e< 6bb6bd3dd6f382dfd36220d4b210a0c77c066651 affected
b817e22b2e91257ace32a6768c3c003faeaa1c5c< 8eadcab7f3dd809edbe5ae20533ff843dfea3a07 affected
b817e22b2e91257ace32a6768c3c003faeaa1c5c< cf5bb09e742a9cf6349127e868329a8f69b7a014 affected
6.8 affected
< 6.8 unaffected
6.9.10≤ 6.9.* unaffected
6.10≤ * unaffected
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I. Basic Information for CVE-2024-42250

Vulnerability Information
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Vulnerability Title
cachefiles: add missing lock protection when polling
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: cachefiles: add missing lock protection when polling Add missing lock protection in poll routine when iterating xarray, otherwise: Even with RCU read lock held, only the slot of the radix tree is ensured to be pinned there, while the data structure (e.g. struct cachefiles_req) stored in the slot has no such guarantee. The poll routine will iterate the radix tree and dereference cachefiles_req accordingly. Thus RCU read lock is not adequate in this case and spinlock is needed here.
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 cachefiles 模块在轮询时缺少锁保护，需要添加自旋锁来保护xarray迭代。
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

Vendor Product Affected Versions CPE Subscribe
Linux Linux 0e19a18f998dcabe8be590e0b39660a1f230209b ~ 97cfd5e20ddc2e33e16ce369626ce76c9a475fd7 -
Linux Linux 6.8 -

II. Public POCs for CVE-2024-42250

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III. Intelligence Information for CVE-2024-42250

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Patches & Fixes for CVE-2024-42250 (4)

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

CVE-2024-42232 9.8 CRITICAL libceph: fix race between delayed_work() and ceph_monc_stop()
CVE-2024-42249 7.8 HIGH spi: don't unoptimize message in spi_async()
CVE-2024-42234 7.8 HIGH mm: fix crashes from deferred split racing folio migration
CVE-2024-42233 7.8 HIGH filemap: replace pte_offset_map() with pte_offset_map_nolock()
CVE-2024-42235 7.8 HIGH s390/mm: Add NULL pointer check to crst_table_free() base_crst_free()
CVE-2024-42236 7.8 HIGH usb: gadget: configfs: Prevent OOB read/write in usb_string_copy()
CVE-2024-42247 7.5 HIGH wireguard: allowedips: avoid unaligned 64-bit memory accesses
CVE-2024-42244 USB: serial: mos7840: fix crash on resume
CVE-2024-42241 mm/shmem: disable PMD-sized page cache if needed
CVE-2024-42242 mmc: sdhci: Fix max_seg_size for 64KiB PAGE_SIZE
CVE-2024-42240 x86/bhi: Avoid warning in #DB handler due to BHI mitigation
CVE-2024-42239 bpf: Fail bpf_timer_cancel when callback is being cancelled
CVE-2024-42238 firmware: cs_dsp: Return error if block header overflows file
CVE-2024-42237 firmware: cs_dsp: Validate payload length before processing block
CVE-2024-42243 mm/filemap: make MAX_PAGECACHE_ORDER acceptable to xarray
CVE-2024-42245 Revert "sched/fair: Make sure to try to detach at least one movable task"
CVE-2024-42246 net, sunrpc: Remap EPERM in case of connection failure in xs_tcp_setup_socket
CVE-2024-42248 tty: serial: ma35d1: Add a NULL check for of_node

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2024-42250

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