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CVE-2026-64015— security/keys: fix missed RCU read section on lookup

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基金会开源的一款操作系统内核。 Linux kernel存在安全漏洞，该漏洞源于在查找过程中未持有RCU读锁调用assoc_array_find函数可能导致生命周期问题。以下版本受到影响：6.1.175之前版本、6.6.142之前版本、6.12.92之前版本、6.18.34之前版本和7.0.11之前版本。

CVSS 7.8 · High EPSS 0.18% · P7

Affected Version Matrix 14

VendorProduct Version RangeStatus
Linux Linux b2a4df200d570b2c33a57e1ebfa5896e4bc81b69< 4c5d407ba3ff7f30561ff73ba1b07ed70c864edc affected
b2a4df200d570b2c33a57e1ebfa5896e4bc81b69< cefa4265b11176c897a7d9e8e54d89e3701c5584 affected
b2a4df200d570b2c33a57e1ebfa5896e4bc81b69< 5659e6923cb72f8e18e8b539109ab512455fe195 affected
b2a4df200d570b2c33a57e1ebfa5896e4bc81b69< 50bb3435a5e627bfbdc52eb4536f49f88b3486b8 affected
b2a4df200d570b2c33a57e1ebfa5896e4bc81b69< 66288dcadf80974436250e9f70ed848836b835b5 affected
b2a4df200d570b2c33a57e1ebfa5896e4bc81b69< 43a1e3744548e6fd85873e6fb43e293eb4010694 affected
3.13 affected
< 3.13 unaffected
… +6 more rows
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I. Basic Information for CVE-2026-64015

Vulnerability Information
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Vulnerability Title
security/keys: fix missed RCU read section on lookup
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: security/keys: fix missed RCU read section on lookup Nicholas Carlini reports that the keyring code calls assoc_array_find() in find_key_to_update() without holding the RCU read lock, while the assoc_array_gc() code really is designed around removing the node from the tree and then freeing it after an RCU grace-period. The regular key handling doesn't see this because holding the keyring semaphore hides any lifetime issues, but the persistent key handling uses a different model. Instead of extending the keyring locking, just do the simple RCU locking that the assoc_array was designed for.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
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基金会开源的一款操作系统内核。 Linux kernel存在安全漏洞，该漏洞源于在查找过程中未持有RCU读锁调用assoc_array_find函数可能导致生命周期问题。以下版本受到影响：6.1.175之前版本、6.6.142之前版本、6.12.92之前版本、6.18.34之前版本和7.0.11之前版本。
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 b2a4df200d570b2c33a57e1ebfa5896e4bc81b69 ~ 4c5d407ba3ff7f30561ff73ba1b07ed70c864edc -
Linux Linux 3.13 -

II. Public POCs for CVE-2026-64015

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III. Intelligence Information for CVE-2026-64015

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Patches & Fixes for CVE-2026-64015 (5)

Same Patch Batch · Linux · 2026-07-19 · 429 CVEs total

CVE-2026-63795 10.0 CRITICAL 9p: avoid putting oldfid in p9_client_walk() error path
CVE-2026-64068 9.8 CRITICAL netfs: Fix missing locking around retry adding new subreqs
CVE-2026-63993 9.8 CRITICAL vxlan: do not reuse cached ip_hdr() value after skb_tunnel_check_pmtu()
CVE-2026-64142 9.8 CRITICAL ksmbd: close durable scavenger races against m_fp_list lookups
CVE-2026-64033 9.8 CRITICAL RDMA/rtrs: Fix use-after-free in path file creation cleanup
CVE-2026-53399 9.8 CRITICAL nfsd: release layout stid on setlease failure
CVE-2026-53398 9.8 CRITICAL NFSD: Fix SECINFO_NO_NAME decode error cleanup
CVE-2026-64061 9.8 CRITICAL netfs: Fix early put of sink folio in netfs_read_gaps()
CVE-2026-64025 9.8 CRITICAL bpf, skmsg: fix verdict sk_data_ready racing with ktls rx
CVE-2026-64089 9.8 CRITICAL batman-adv: tt: fix negative last_changeset_len
CVE-2026-64125 9.8 CRITICAL net: bcmgenet: keep RBUF EEE/PM disabled
CVE-2026-64091 9.8 CRITICAL batman-adv: tt: fix TOCTOU race for reported vlans
CVE-2026-64066 9.8 CRITICAL netfs: Fix netfs_read_to_pagecache() to pause on subreq failure
CVE-2026-63887 9.8 CRITICAL scsi: target: iscsi: Bound iscsi_encode_text_output() appends to rsp_buf
CVE-2026-63808 9.8 CRITICAL exfat: fix potential use-after-free in exfat_find_dir_entry()
CVE-2026-63978 9.8 CRITICAL net/handshake: Drain pending requests at net namespace exit
CVE-2026-64132 9.8 CRITICAL ipv6: ioam: refresh hdr pointer before ioam6_event()
CVE-2026-63979 9.8 CRITICAL net/handshake: hand off the pinned file reference to accept_doit
CVE-2026-64136 9.8 CRITICAL smb: client: protect tc_count increment in smb2_find_smb_sess_tcon_unlocked()
CVE-2026-63800 9.8 CRITICAL pNFS: Fix use-after-free in pnfs_update_layout()

Showing top 20 of 429 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-64015

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