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CVE-2026-63865— bpf: Drop task_to_inode and inet_conn_established from lsm sleepable hooks

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 5.11版本存在安全漏洞，该漏洞源于bpf_lsm_task_to_inode()在rcu_read_lock()中调用，bpf_lsm_inet_conn_established()在软中断环境中调用，导致可休眠LSM程序无法使用这两个挂钩。

CVSS 8.8 · High EPSS 0.18% · P7

Possible ATT&CK Techniques 1 AI

T1055 · Process Injection

Affected Version Matrix 16

VendorProduct Version RangeStatus
Linux Linux 423f16108c9d832bd96059d5c882c8ef6d76eb96< 452a927cddcd67478d030e646f41cb904a93156f affected
423f16108c9d832bd96059d5c882c8ef6d76eb96< f0fc2a9828171205244a28013f02889f50b71c9f affected
423f16108c9d832bd96059d5c882c8ef6d76eb96< 26b380a3ca0b605fd8860995ed6a208f276dd316 affected
423f16108c9d832bd96059d5c882c8ef6d76eb96< 0d918263c9bfc86078edb2e2f7302a0c6ce42b7c affected
423f16108c9d832bd96059d5c882c8ef6d76eb96< 281f2a214565a5cbf8b7355a65738d80bd19b8c5 affected
423f16108c9d832bd96059d5c882c8ef6d76eb96< 989f1b93907de1753a814996222da375f07e579b affected
423f16108c9d832bd96059d5c882c8ef6d76eb96< beaf0e96b1da74549a6cabd040f9667d83b2e97e affected
5.11 affected
… +8 more rows
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I. Basic Information for CVE-2026-63865

Vulnerability Information
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Vulnerability Title
bpf: Drop task_to_inode and inet_conn_established from lsm sleepable hooks
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: bpf: Drop task_to_inode and inet_conn_established from lsm sleepable hooks bpf_lsm_task_to_inode() is called under rcu_read_lock() and bpf_lsm_inet_conn_established() is called from softirq context, so neither hook can be used by sleepable LSM programs.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/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 5.11版本存在安全漏洞，该漏洞源于bpf_lsm_task_to_inode()在rcu_read_lock()中调用，bpf_lsm_inet_conn_established()在软中断环境中调用，导致可休眠LSM程序无法使用这两个挂钩。
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 423f16108c9d832bd96059d5c882c8ef6d76eb96 ~ 452a927cddcd67478d030e646f41cb904a93156f -
Linux Linux 5.11 -

II. Public POCs for CVE-2026-63865

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III. Intelligence Information for CVE-2026-63865

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Patches & Fixes for CVE-2026-63865 (6)

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-2026-64142 9.8 CRITICAL ksmbd: close durable scavenger races against m_fp_list lookups
CVE-2026-64102 9.8 CRITICAL RDMA/siw: Reject MPA FPDU length underflow before signed receive math
CVE-2026-64160 9.8 CRITICAL netfs: Fix potential for tearing in ->remote_i_size and ->zero_point
CVE-2026-63888 9.8 CRITICAL scsi: target: iscsi: Fix CRC overread and double-free in iscsit_handle_text_cmd()
CVE-2026-64150 9.8 CRITICAL netfilter: nft_inner: release local_lock before re-enabling softirqs
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-2026-63984 9.8 CRITICAL ipv6: rpl: fix hdrlen overflow in ipv6_rpl_srh_decompress()
CVE-2026-64025 9.8 CRITICAL bpf, skmsg: fix verdict sk_data_ready racing with ktls rx
CVE-2026-64122 9.8 CRITICAL net/mlx5e: Fix use-after-free in mlx5e_tx_reporter_timeout_recover
CVE-2026-63808 9.8 CRITICAL exfat: fix potential use-after-free in exfat_find_dir_entry()
CVE-2026-63979 9.8 CRITICAL net/handshake: hand off the pinned file reference to accept_doit
CVE-2026-64162 9.8 CRITICAL idpf: fix read_dev_clk_lock spinlock init in idpf_ptp_init()
CVE-2026-64046 9.8 CRITICAL net: tls: prevent chain-after-chain in plain text SG
CVE-2026-64055 9.8 CRITICAL net: ethernet: cortina: Carry over frag counter
CVE-2026-63922 9.8 CRITICAL ipv6: exthdrs: refresh nh after handling HAO option
CVE-2026-64047 9.8 CRITICAL net: tls: fix off-by-one in sg_chain entry count for wrapped sk_msg ring
CVE-2026-63978 9.8 CRITICAL net/handshake: Drain pending requests at net namespace exit
CVE-2026-64056 9.8 CRITICAL net: ethernet: cortina: Make RX SKB per-port

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-2026-63865

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