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CVE-2023-53458— media: cx23885: Fix a null-ptr-deref bug in buffer_prepare() and buffer_finish()

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，该漏洞源于未检查cx23885_risc_buffer返回值和risc-cpu值，可能导致空指针取消引用。

AI Predicted 5.5 Difficulty: Easy EPSS 0.17% · P6

Affected Version Matrix 10

VendorProduct Version RangeStatus
Linux Linux 4d63a25c4523b5d18e5307897d56aff785f43bf5< f0a06203f2fe63f04311467200c99c4ee1926578 affected
4d63a25c4523b5d18e5307897d56aff785f43bf5< 6738841f6fcf23e9fc30e2449f32fc84ee19c6f1 affected
4d63a25c4523b5d18e5307897d56aff785f43bf5< 5b8e5e28e85a546dfccc3895befe0e823fdd7c89 affected
4d63a25c4523b5d18e5307897d56aff785f43bf5< 47e8b73bc35d7c54642f78e498697692f6358996 affected
3.18 affected
< 3.18 unaffected
5.15.113≤ 5.15.* unaffected
6.1.30≤ 6.1.* unaffected
… +2 more rows
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I. Basic Information for CVE-2023-53458

Vulnerability Information
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Vulnerability Title
media: cx23885: Fix a null-ptr-deref bug in buffer_prepare() and buffer_finish()
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: media: cx23885: Fix a null-ptr-deref bug in buffer_prepare() and buffer_finish() When the driver calls cx23885_risc_buffer() to prepare the buffer, the function call dma_alloc_coherent may fail, resulting in a empty buffer risc->cpu. Later when we free the buffer or access the buffer, null ptr deref is triggered. This bug is similar to the following one: https://git.linuxtv.org/media_stage.git/commit/?id=2b064d91440b33fba5b452f2d1b31f13ae911d71. We believe the bug can be also dynamically triggered from user side. Similarly, we fix this by checking the return value of cx23885_risc_buffer() and the value of risc->cpu before buffer free.
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，该漏洞源于未检查cx23885_risc_buffer返回值和risc-cpu值，可能导致空指针取消引用。
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

Vendor Product Affected Versions CPE Subscribe
Linux Linux 4d63a25c4523b5d18e5307897d56aff785f43bf5 ~ f0a06203f2fe63f04311467200c99c4ee1926578 -
Linux Linux 3.18 -

II. Public POCs for CVE-2023-53458

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III. Intelligence Information for CVE-2023-53458

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Same Patch Batch · Linux · 2025-10-01 · 169 CVEs total

CVE-2023-53517 9.8 CRITICAL tipc: do not update mtu if msg_max is too small in mtu negotiation
CVE-2023-53454 8.8 HIGH HID: multitouch: Correct devm device reference for hidinput input_dev name
CVE-2025-39918 8.8 HIGH wifi: mt76: fix linked list corruption
CVE-2025-39919 8.8 HIGH wifi: mt76: mt7996: add missing check for rx wcid entries
CVE-2022-50442 8.4 HIGH fs/ntfs3: Validate buffer length while parsing index
CVE-2023-53493 8.4 HIGH accel/qaic: tighten bounds checking in decode_message()
CVE-2023-53465 7.8 HIGH soundwire: qcom: fix storing port config out-of-bounds
CVE-2023-53485 7.8 HIGH fs: jfs: Fix UBSAN: array-index-out-of-bounds in dbAllocDmapLev
CVE-2022-50440 7.8 HIGH drm/vmwgfx: Validate the box size for the snooped cursor
CVE-2022-50454 7.8 HIGH drm/nouveau: fix a use-after-free in nouveau_gem_prime_import_sg_table()
CVE-2025-39924 7.8 HIGH erofs: fix invalid algorithm for encoded extents
CVE-2023-53510 7.8 HIGH scsi: ufs: core: Fix handling of lrbp->cmd
CVE-2025-39927 7.8 HIGH ceph: fix race condition validating r_parent before applying state
CVE-2023-53506 7.8 HIGH udf: Do not bother merging very long extents
CVE-2022-50421 7.8 HIGH rpmsg: char: Avoid double destroy of default endpoint
CVE-2022-50437 7.8 HIGH drm/msm/hdmi: fix memory corruption with too many bridges
CVE-2023-53495 7.8 HIGH net: ethernet: mvpp2_main: fix possible OOB write in mvpp2_ethtool_get_rxnfc()
CVE-2023-53494 7.8 HIGH crypto: xts - Handle EBUSY correctly
CVE-2022-50432 7.8 HIGH kernfs: fix use-after-free in __kernfs_remove
CVE-2023-53492 7.8 HIGH netfilter: nf_tables: do not ignore genmask when looking up chain by id

Showing top 20 of 169 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2023-53458

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