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CVE-2025-39887— tracing/osnoise: Fix null-ptr-deref in bitmap_parselist()

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bitmap_parselist函数未正确处理空指针，可能导致空指针取消引用。

AI Predicted 7.8 Difficulty: Easy EPSS 0.13% · P2

Possible ATT&CK Techniques 1 AI

T1059 · Command and Scripting Interpreter

Affected Version Matrix 6

VendorProduct Version RangeStatus
Linux Linux 17f89102fe23d7389085a8820550df688f79888a< e33228a2cc7ff706ca88533464e8a3b525b961ed affected
17f89102fe23d7389085a8820550df688f79888a< c1628c00c4351dd0727ef7f670694f68d9e663d8 affected
6.16 affected
< 6.16 unaffected
6.16.8≤ 6.16.* unaffected
6.17≤ * unaffected
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I. Basic Information for CVE-2025-39887

Vulnerability Information
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Vulnerability Title
tracing/osnoise: Fix null-ptr-deref in bitmap_parselist()
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: tracing/osnoise: Fix null-ptr-deref in bitmap_parselist() A crash was observed with the following output: BUG: kernel NULL pointer dereference, address: 0000000000000010 Oops: Oops: 0000 [#1] SMP NOPTI CPU: 2 UID: 0 PID: 92 Comm: osnoise_cpus Not tainted 6.17.0-rc4-00201-gd69eb204c255 #138 PREEMPT(voluntary) RIP: 0010:bitmap_parselist+0x53/0x3e0 Call Trace: <TASK> osnoise_cpus_write+0x7a/0x190 vfs_write+0xf8/0x410 ? do_sys_openat2+0x88/0xd0 ksys_write+0x60/0xd0 do_syscall_64+0xa4/0x260 entry_SYSCALL_64_after_hwframe+0x77/0x7f </TASK> This issue can be reproduced by below code: fd=open("/sys/kernel/debug/tracing/osnoise/cpus", O_WRONLY); write(fd, "0-2", 0); When user pass 'count=0' to osnoise_cpus_write(), kmalloc() will return ZERO_SIZE_PTR (16) and cpulist_parse() treat it as a normal value, which trigger the null pointer dereference. Add check for the parameter 'count'.
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bitmap_parselist函数未正确处理空指针，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 17f89102fe23d7389085a8820550df688f79888a ~ e33228a2cc7ff706ca88533464e8a3b525b961ed -
Linux Linux 6.16 -

II. Public POCs for CVE-2025-39887

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III. Intelligence Information for CVE-2025-39887

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Same Patch Batch · Linux · 2025-09-23 · 21 CVEs total

CVE-2025-39880 9.8 CRITICAL libceph: fix invalid accesses to ceph_connection_v1_info
CVE-2025-39869 8.4 HIGH dmaengine: ti: edma: Fix memory allocation size for queue_priority_map
CVE-2025-39882 8.4 HIGH drm/mediatek: fix potential OF node use-after-free
CVE-2025-39888 7.8 HIGH fuse: Block access to folio overlimit
CVE-2025-39872 7.8 HIGH hsr: hold rcu and dev lock for hsr_get_port_ndev
CVE-2025-39873 7.8 HIGH can: xilinx_can: xcan_write_frame(): fix use-after-free of transmitted SKB
CVE-2025-39868 7.8 HIGH erofs: fix runtime warning on truncate_folio_batch_exceptionals()
CVE-2025-39881 7.8 HIGH kernfs: Fix UAF in polling when open file is released
CVE-2025-39879 ceph: always call ceph_shift_unused_folios_left()
CVE-2025-39885 ocfs2: fix recursive semaphore deadlock in fiemap call
CVE-2025-39886 bpf: Tell memcg to use allow_spinning=false path in bpf_timer_init()
CVE-2025-39883 mm/memory-failure: fix VM_BUG_ON_PAGE(PagePoisoned(page)) when unpoison memory
CVE-2025-39884 btrfs: fix subvolume deletion lockup caused by inodes xarray race
CVE-2025-39878 ceph: fix crash after fscrypt_encrypt_pagecache_blocks() error
CVE-2025-39877 mm/damon/sysfs: fix use-after-free in state_show()
CVE-2025-39876 net: fec: Fix possible NPD in fec_enet_phy_reset_after_clk_enable()
CVE-2025-39874 macsec: sync features on RTM_NEWLINK
CVE-2025-39875 igb: Fix NULL pointer dereference in ethtool loopback test
CVE-2025-39871 dmaengine: idxd: Remove improper idxd_free
CVE-2025-39870 dmaengine: idxd: Fix double free in idxd_setup_wqs()

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2025-39887

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