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CVE-2023-53728— posix-timers: Ensure timer ID search-loop limit is valid

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posix_timer_add函数中定时器ID搜索循环限制无效，可能导致无限循环。

AI Predicted 5.3 Difficulty: Moderate EPSS 0.21% · P11

Possible ATT&CK Techniques 1 AI

T1203 · Exploitation for Client Execution

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux 5ed67f05f66c41e39880a6d61358438a25f9fee5< 8dc52c200b889bc1cb34288fbf623d4ff381d2ae affected
5ed67f05f66c41e39880a6d61358438a25f9fee5< 9ea26a8494a0a9337e7415eafd6f3ed940327dc5 affected
5ed67f05f66c41e39880a6d61358438a25f9fee5< 8ad6679a5bb97cdb3e14942729292b4bfcc0e223 affected
5ed67f05f66c41e39880a6d61358438a25f9fee5< 322377cc909defcca9451487484845e7e1d20d1b affected
5ed67f05f66c41e39880a6d61358438a25f9fee5< ef535e0315afd098c4beb1da364847eca4b56a20 affected
5ed67f05f66c41e39880a6d61358438a25f9fee5< 6a0ac84501b4fec73a1a823c55cf13584c43f418 affected
5ed67f05f66c41e39880a6d61358438a25f9fee5< 37175e25edf7cc0d5a2cd2c2a1cbe2dcbf4a1937 affected
5ed67f05f66c41e39880a6d61358438a25f9fee5< 8ce8849dd1e78dadcee0ec9acbd259d239b7069f affected
… +10 more rows
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I. Basic Information for CVE-2023-53728

Vulnerability Information
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Vulnerability Title
posix-timers: Ensure timer ID search-loop limit is valid
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: posix-timers: Ensure timer ID search-loop limit is valid posix_timer_add() tries to allocate a posix timer ID by starting from the cached ID which was stored by the last successful allocation. This is done in a loop searching the ID space for a free slot one by one. The loop has to terminate when the search wrapped around to the starting point. But that's racy vs. establishing the starting point. That is read out lockless, which leads to the following problem: CPU0 CPU1 posix_timer_add() start = sig->posix_timer_id; lock(hash_lock); ... posix_timer_add() if (++sig->posix_timer_id < 0) start = sig->posix_timer_id; sig->posix_timer_id = 0; So CPU1 can observe a negative start value, i.e. -1, and the loop break never happens because the condition can never be true: if (sig->posix_timer_id == start) break; While this is unlikely to ever turn into an endless loop as the ID space is huge (INT_MAX), the racy read of the start value caught the attention of KCSAN and Dmitry unearthed that incorrectness. Rewrite it so that all id operations are under the hash lock.
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posix_timer_add函数中定时器ID搜索循环限制无效，可能导致无限循环。
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 5ed67f05f66c41e39880a6d61358438a25f9fee5 ~ 8dc52c200b889bc1cb34288fbf623d4ff381d2ae -
Linux Linux 3.10 -

II. Public POCs for CVE-2023-53728

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III. Intelligence Information for CVE-2023-53728

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Same Patch Batch · Linux · 2025-10-22 · 67 CVEs total

CVE-2023-53711 8.2 HIGH NFS: Fix a potential data corruption
CVE-2023-53705 8.2 HIGH ipv6: Fix out-of-bounds access in ipv6_find_tlv()
CVE-2022-50567 7.8 HIGH fs: jfs: fix shift-out-of-bounds in dbAllocAG
CVE-2023-53729 7.8 HIGH soc: qcom: qmi_encdec: Restrict string length in decode
CVE-2023-53698 7.8 HIGH xsk: fix refcount underflow in error path
CVE-2023-53695 7.8 HIGH udf: Detect system inodes linked into directory hierarchy
CVE-2023-53692 7.8 HIGH ext4: fix use-after-free read in ext4_find_extent for bigalloc + inline
CVE-2023-53707 7.8 HIGH drm/amdgpu: Fix integer overflow in amdgpu_cs_pass1
CVE-2022-50570 7.8 HIGH platform/chrome: fix memory corruption in ioctl
CVE-2022-50569 7.8 HIGH xfrm: Update ipcomp_scratches with NULL when freed
CVE-2023-53718 7.8 HIGH ring-buffer: Do not swap cpu_buffer during resize process
CVE-2022-50581 7.8 HIGH hfs: fix OOB Read in __hfs_brec_find
CVE-2023-53713 7.8 HIGH arm64: sme: Use STR P to clear FFR context field in streaming SVE mode
CVE-2023-53726 7.1 HIGH arm64: csum: Fix OoB access in IP checksum code for negative lengths
CVE-2023-53716 net: fix skb leak in __skb_tstamp_tx()
CVE-2023-53708 ACPI: x86: s2idle: Catch multiple ACPI_TYPE_PACKAGE objects
CVE-2023-53706 mm/vmemmap/devdax: fix kernel crash when probing devdax devices
CVE-2023-53704 clk: imx: clk-imx8mp: improve error handling in imx8mp_clocks_probe()
CVE-2023-53712 ARM: 9317/1: kexec: Make smp stop calls asynchronous
CVE-2023-53702 s390/crypto: use vector instructions only if available for ChaCha20

Showing top 20 of 67 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2023-53728

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