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CVE-2026-80663— tools/power/x86/intel-speed-select: Harden daemon pidfile open

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intel-speed-select守护进程在打开pidfile时未使用O_NOFOLLOW和fstat()验证符号链接，本地非特权用户可预创建符号链接，导致以root权限运行的守护进程将内容写入攻击者选择的文件，造成符号链接攻击风险。

CVSS 7.1 · High EPSS 0.17% · P6

Possible ATT&CK Techniques 1 AI

T1078 · Valid Accounts

Affected Version Matrix 14

VendorProduct Version RangeStatus
Linux Linux 7fd786dfbd2c55ddee3b87f33c82f1c58bdb1dd6< 905493a6338c82a70da16f86e0a6215db5a3d73d affected
7fd786dfbd2c55ddee3b87f33c82f1c58bdb1dd6< db938eb9a3c1317596c28e94413b33426508d51b affected
7fd786dfbd2c55ddee3b87f33c82f1c58bdb1dd6< 72a07abc6b9046f07a08bba353cad7667bcc9dce affected
7fd786dfbd2c55ddee3b87f33c82f1c58bdb1dd6< 19ffeb30fdfce63f8d6aca71bcdddb3f69d46278 affected
7fd786dfbd2c55ddee3b87f33c82f1c58bdb1dd6< e8adac69d1bdf035ef97cc914e845acd4ef08e28 affected
7fd786dfbd2c55ddee3b87f33c82f1c58bdb1dd6< 607af438e6430893a822964c841a1994b33acccc affected
5.18 affected
< 5.18 unaffected
… +6 more rows
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I. Basic Information for CVE-2026-80663

Vulnerability Information
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Vulnerability Title
tools/power/x86/intel-speed-select: Harden daemon pidfile open
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: tools/power/x86/intel-speed-select: Harden daemon pidfile open Avoid symlink-based pidfile clobbering by opening the pidfile with O_NOFOLLOW and validating it with fstat() before locking/writing. The daemon currently uses a fixed pidfile path under /tmp. A local unprivileged user can pre-create a symlink at that path and cause a root-run daemon instance to write into an attacker-chosen file.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/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基金会开源的一个操作系统内核。 Linux kernel存在安全漏洞，该漏洞源于intel-speed-select守护进程在打开pidfile时未使用O_NOFOLLOW和fstat()验证符号链接，本地非特权用户可预创建符号链接，导致以root权限运行的守护进程将内容写入攻击者选择的文件，造成符号链接攻击风险。
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 7fd786dfbd2c55ddee3b87f33c82f1c58bdb1dd6 ~ 905493a6338c82a70da16f86e0a6215db5a3d73d -
Linux Linux 5.18 -

II. Public POCs for CVE-2026-80663

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III. Intelligence Information for CVE-2026-80663

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Patches & Fixes for CVE-2026-80663 (6)

Same Patch Batch · Linux · 2026-08-28 · 135 CVEs total

CVE-2026-80634 9.8 CRITICAL netfilter: flowtable: avoid num_encaps underflow on bridge VLAN untag
CVE-2026-80694 9.8 CRITICAL net: ethernet: mtk_eth_soc: pass eth to mtk_handle_irq_rx in poll_controller
CVE-2026-80681 9.8 CRITICAL vxlan: re-fetch eth header after route_shortcircuit()
CVE-2026-80674 9.8 CRITICAL ntfs: validate resident attribute lists and harden the validator
CVE-2026-80673 9.8 CRITICAL ntfs: bound the look-ahead attribute-list entry in ntfs_external_attr_find()
CVE-2026-80668 9.8 CRITICAL netfilter: nf_conntrack_expect: use conntrack GC to reap expectations
CVE-2026-80630 9.8 CRITICAL net/sched: sch_fq_codel: Do not call qdisc_tree_reduce_backlog during peek before restorin
CVE-2026-80617 9.8 CRITICAL net: airoha: fix foe_check_time allocation size
CVE-2026-80612 9.8 CRITICAL net: lwtunnel: Drop skb metadata before LWT encapsulation
CVE-2026-80714 9.8 CRITICAL ipvs: do not propagate one-packet flag to synced conns
CVE-2026-80609 9.8 CRITICAL qede: fix out-of-bounds check for cqe->len_list[]
CVE-2026-80600 9.8 CRITICAL batman-adv: dat: acquire ARP hw source only after skb realloc
CVE-2026-80693 9.3 CRITICAL idpf: bound interrupt-vector register fill to the allocated array
CVE-2026-80684 9.3 CRITICAL KVM: s390: pci: Fix NULL dereference on AIBV allocation failure
CVE-2026-80671 9.3 CRITICAL perf sched: Fix register_pid() overflow, strcpy, and BUG_ON
CVE-2026-80603 9.1 CRITICAL netfilter: nf_conntrack_irc: fix parse_dcc() off-by-one OOB read
CVE-2026-80670 9.1 CRITICAL perf tools: Use perf_env__get_cpu_topology() in machine__resolve()
CVE-2026-80721 8.8 HIGH Bluetooth: ISO: ensure no dangling hcon references in iso_conn
CVE-2026-80722 8.8 HIGH wifi: mac80211: validate individual TWT params before driver setup
CVE-2026-80724 8.8 HIGH ptp: vmclock: prevent read-only mappings from becoming writable

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-2026-80663

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