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CVE-2026-89749— tracing: Fix crash passing ERR_PTR to kthread_stop()

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基金会开源的一个操作系统内核。 Linux kernel存在安全漏洞，该漏洞源于event_test_stuff()调用kthread_run()后未检查其返回值，kthread_stop()解引用无效指针，可能导致内核崩溃。

AI Predicted 5.5 Difficulty: Moderate EPSS 0.22% · P11

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux e6187007d6c365b551c69ea3df46f06fd1c8bd19< c1a4fb7aa290f158d50654d640292e49d9055fd1 affected
e6187007d6c365b551c69ea3df46f06fd1c8bd19< 42ccb215ef0a552acbbd32f81009bfe4b278ba77 affected
e6187007d6c365b551c69ea3df46f06fd1c8bd19< 98d06fb9865a490e12ebe32d65b9ffac6108614d affected
e6187007d6c365b551c69ea3df46f06fd1c8bd19< ceb1707aef5824cf024eb82d10787b7621e2ff35 affected
e6187007d6c365b551c69ea3df46f06fd1c8bd19< 12a499f741fc5be3731c8b0a0d909406575cc2eb affected
e6187007d6c365b551c69ea3df46f06fd1c8bd19< adadf4192f700bca82abfda9fa6d58c0bf37cc04 affected
e6187007d6c365b551c69ea3df46f06fd1c8bd19< c40e0b4fa365969e67011529eabdfb66d1022256 affected
e6187007d6c365b551c69ea3df46f06fd1c8bd19< 649bc7df3e5d7be6f7996a95084037dbf3cad1e5 affected
… +10 more rows
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I. Basic Information for CVE-2026-89749

Vulnerability Information
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Vulnerability Title
tracing: Fix crash passing ERR_PTR to kthread_stop()
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: tracing: Fix crash passing ERR_PTR to kthread_stop() event_test_stuff() calls kthread_run() and unconditionally passes the returned task_struct pointer to kthread_stop(). kthread_run() returns an error pointer such as ERR_PTR(-ENOMEM) when kthread creation fails, for example under memory pressure during the boot-time event self-test. kthread_stop() then dereferences the invalid pointer, crashing the kernel. Check the result of kthread_run() before passing it to kthread_stop(). Use WARN_ON() so that a failure to create the self-test thread does not go unnoticed, matching the ring-buffer self-test fix in commit 91542863abad ("ring-buffer: Fix crash passing ERR_PTR to kthread_stop()").
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基金会开源的一个操作系统内核。 Linux kernel存在安全漏洞，该漏洞源于event_test_stuff()调用kthread_run()后未检查其返回值，kthread_stop()解引用无效指针，可能导致内核崩溃。
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 e6187007d6c365b551c69ea3df46f06fd1c8bd19 ~ c1a4fb7aa290f158d50654d640292e49d9055fd1 -
Linux Linux 2.6.31 -

II. Public POCs for CVE-2026-89749

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III. Intelligence Information for CVE-2026-89749

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Patches & Fixes for CVE-2026-89749 (8)

Same Patch Batch · Linux · 2026-09-11 · 431 CVEs total

CVE-2026-89669 9.8 CRITICAL nfsd: initialize copy-notify stateid before publishing it
CVE-2026-89536 9.8 CRITICAL SUNRPC: wait for in-flight client TLS handshake callback
CVE-2026-89533 9.8 CRITICAL svcrdma: Fix offset arithmetic in read_chunk_range
CVE-2026-81002 9.8 CRITICAL xdp: fix zero-copy frame layout
CVE-2026-89643 9.8 CRITICAL audit: avoid dropping live tree ref on fsnotify rule autoremove
CVE-2026-89526 9.8 CRITICAL svcrdma: Validate Read chunk positions before reconstruction
CVE-2026-89652 9.8 CRITICAL ceph: bound copied dentry name length in NFS export get_name
CVE-2026-89651 9.8 CRITICAL ceph: bound MDSCapAuth path and fs_name decode in handle_session()
CVE-2026-89653 9.8 CRITICAL ceph: reject export_targets ranks >= CEPH_MAX_MDS in mdsmap decode
CVE-2026-89654 9.8 CRITICAL ceph: fix UAF in check_new_map() on session freed during unlock
CVE-2026-89656 9.8 CRITICAL libceph: reject buckets with mismatched CRUSH ids
CVE-2026-89655 9.8 CRITICAL ceph: fix UAF in __kick_flushing_caps() on cf entry freed during unlock
CVE-2026-89712 9.8 CRITICAL NFSD: restart ssc_expire_umount walk after dropping nfsd_ssc_lock
CVE-2026-89658 9.8 CRITICAL NFSD: Prevent client use-after-free during NFSv4.0 revoked-state cleanup
CVE-2026-89660 9.8 CRITICAL NFSD: Prevent client use-after-free during admin state revocation
CVE-2026-89659 9.8 CRITICAL NFSD: Prevent client use-after-free during delegation revoke
CVE-2026-89708 9.8 CRITICAL nfsd: RCU-protect cl_cb_session to fix use-after-free on session teardown
CVE-2026-89662 9.8 CRITICAL NFSD: Prevent lock owner use-after-free during client teardown
CVE-2026-89689 9.8 CRITICAL nfsd: don't free session slots that are still in use
CVE-2026-89686 9.8 CRITICAL nfsd: fix BUG_ON in nfsd4_alloc_layout_stateid on racing delegation revoke

Showing top 20 of 431 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-89749

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