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CVE-2026-46196— tracepoint: balance regfunc() on func_add() failure in tracepoint_add_func()

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tracepoint中tracepoint_add_func在func_add失败时未调用匹配的unregfunc，导致regfunc的副作用残留，可能造成系统调用跟踪开销持续存在。

AI Predicted 7.5 Difficulty: Moderate EPSS 0.13% · P3

Possible ATT&CK Techniques 1 AI

T1564.008 · Email Hiding Rules

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux 8cf868affdc459beee1a941df0cfaba1673740e3< 5787052e5f69beb649f3d6a80a8aa37d9e683e4e affected
8cf868affdc459beee1a941df0cfaba1673740e3< 4f1756d043e56ea2e9a6c858fb290a0cf6fc2251 affected
8cf868affdc459beee1a941df0cfaba1673740e3< 36ff362235307af95152d510b53c2d9b8773a342 affected
8cf868affdc459beee1a941df0cfaba1673740e3< 247ed8a969f981bfba3112fd4bb441eaa6cef59c affected
8cf868affdc459beee1a941df0cfaba1673740e3< 7bcadb3c2bc1cf60690e931aadd35fb7bd646a49 affected
8cf868affdc459beee1a941df0cfaba1673740e3< 2c5b8eeea006eb694c81631cd5713d494b80be90 affected
8cf868affdc459beee1a941df0cfaba1673740e3< 342829e042ac00f3d68d442ea92873fb6683f494 affected
8cf868affdc459beee1a941df0cfaba1673740e3< fad217e16fded7f3c09f8637b0f6a224d58b5f2e affected
… +10 more rows
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I. Basic Information for CVE-2026-46196

Vulnerability Information
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Vulnerability Title
tracepoint: balance regfunc() on func_add() failure in tracepoint_add_func()
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: tracepoint: balance regfunc() on func_add() failure in tracepoint_add_func() When a tracepoint goes through the 0 -> 1 transition, tracepoint_add_func() invokes the subsystem's ext->regfunc() before attempting to install the new probe via func_add(). If func_add() then fails (for example, when allocate_probes() cannot allocate a new probe array under memory pressure and returns -ENOMEM), the function returns the error without calling the matching ext->unregfunc(), leaving the side effects of regfunc() behind with no installed probe to justify them. For syscall tracepoints this is particularly unpleasant: syscall_regfunc() bumps sys_tracepoint_refcount and sets SYSCALL_TRACEPOINT on every task. After a leaked failure, the refcount is stuck at a non-zero value with no consumer, and every task continues paying the syscall trace entry/exit overhead until reboot. Other subsystems providing regfunc()/unregfunc() pairs exhibit similarly scoped persistent state. Mirror the existing 1 -> 0 cleanup and call ext->unregfunc() in the func_add() error path, gated on the same condition used there so the unwind is symmetric with the registration.
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tracepoint中tracepoint_add_func在func_add失败时未调用匹配的unregfunc，导致regfunc的副作用残留，可能造成系统调用跟踪开销持续存在。
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 8cf868affdc459beee1a941df0cfaba1673740e3 ~ 5787052e5f69beb649f3d6a80a8aa37d9e683e4e -
Linux Linux 4.10 -

II. Public POCs for CVE-2026-46196

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III. Intelligence Information for CVE-2026-46196

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Patches & Fixes for CVE-2026-46196 (8)

Same Patch Batch · Linux · 2026-05-28 · 135 CVEs total

CVE-2026-46135 9.8 CRITICAL nvmet-tcp: fix race between ICReq handling and queue teardown
CVE-2026-46137 9.8 CRITICAL mptcp: pm: ADD_ADDR rtx: fix potential data-race
CVE-2026-46115 9.8 CRITICAL block: add pgmap check to biovec_phys_mergeable
CVE-2026-46195 9.8 CRITICAL smb: client: validate dacloffset before building DACL pointers
CVE-2026-46155 9.1 CRITICAL smb/client: fix out-of-bounds read in smb2_compound_op()
CVE-2026-46119 9.1 CRITICAL libceph: Fix slab-out-of-bounds access in auth message processing
CVE-2026-46185 9.1 CRITICAL smb/client: fix out-of-bounds read in symlink_data()
CVE-2026-46212 8.8 HIGH batman-adv: bla: prevent use-after-free when deleting claims
CVE-2026-46174 8.8 HIGH x86/CPU/AMD: Prevent improper isolation of shared resources in Zen2's op cache
CVE-2026-46125 8.8 HIGH wifi: mac80211: remove station if connection prep fails
CVE-2026-46198 8.8 HIGH batman-adv: fix integer overflow on buff_pos
CVE-2026-46166 8.8 HIGH wifi: mac80211: use safe list iteration in radar detect work
CVE-2026-46238 8.8 HIGH batman-adv: stop caching unowned originator pointers in BAT IV
CVE-2026-46152 8.8 HIGH wifi: mac80211: drop stray 'static' from fast-RX rx_result
CVE-2026-46113 8.8 HIGH KVM: x86: Fix shadow paging use-after-free due to unexpected GFN
CVE-2026-46138 8.1 HIGH Bluetooth: hci_event: Fix OOB read and infinite loop in hci_le_create_big_complete_evt
CVE-2026-46232 8.1 HIGH HID: playstation: Clamp num_touch_reports
CVE-2026-46227 7.8 HIGH sctp: revalidate list cursor after sctp_sendmsg_to_asoc() in SCTP_SENDALL
CVE-2026-46210 7.8 HIGH media: iris: fix use-after-free of fmt_src during MBPF check
CVE-2026-46206 7.8 HIGH batman-adv: reject new tp_meter sessions during teardown

Showing top 20 of 135 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-46196

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