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CVE-2026-89992— cpuidle: dt_idle_genpd: kfree() the original name allocation

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.

在 Linux 内核中，以下漏洞已得到修复： cpuidle: dt_idle_genpd: 对原始 name 分配内存调用 kfree() 问题描述： 函数使用 分配了完整的节点路径字符串，然后将 指向该字符串的 （即路径中最后一级目录名）部分。 然而， 函数直接对 调用 ，但此时 指向的是字符串中间的指针，而非 返回的原始分配指针的起始地址，导致内存释放错误（可能引发堆损坏或内存泄漏）。 修复方法： 改为将 basename 拷贝到独立分配的内存中，确保 指向一块可被 正确释放的独立内存块，而不是指向长字符串内

CVSS 8.4 · High EPSS 0.20% · P9

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 14

VendorProduct Version RangeStatus
Linux Linux 9d976d6721dfb525b81ce981e1363c70c0975aab< 1312ae33b91430ec99e69cd3d47f0e50a4ebf54b affected
9d976d6721dfb525b81ce981e1363c70c0975aab< a38caa9ed0d5c61c17d88393b14b292199289c1f affected
9d976d6721dfb525b81ce981e1363c70c0975aab< 09d002c8fb0261d35ce9d8a705de5db034ee90b8 affected
9d976d6721dfb525b81ce981e1363c70c0975aab< b519dfce1998c323e54a56f911cf708d9ba0e076 affected
9d976d6721dfb525b81ce981e1363c70c0975aab< 3394c7ba23336bdb7ece29127130fd01731d42d8 affected
9d976d6721dfb525b81ce981e1363c70c0975aab< 2b0ac85512b7f67479127b2713254490662eb13d affected
5.18 affected
< 5.18 unaffected
… +6 more rows
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I. Basic Information for CVE-2026-89992

Vulnerability Information
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Vulnerability Title
cpuidle: dt_idle_genpd: kfree() the original name allocation
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: cpuidle: dt_idle_genpd: kfree() the original name allocation dt_idle_pd_alloc() kasprintf()s the full node path, then points pd->name at kbasename() of that string. dt_idle_pd_free() kfree()s pd->name, which is no longer the start of the allocation. Copy the basename instead.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:N/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

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux 9d976d6721dfb525b81ce981e1363c70c0975aab ~ 1312ae33b91430ec99e69cd3d47f0e50a4ebf54b -
Linux Linux 5.18 -

II. Public POCs for CVE-2026-89992

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III. Intelligence Information for CVE-2026-89992

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Other References for CVE-2026-89992 (6)

Same Patch Batch · Linux · 2026-09-16 · 276 CVEs total

CVE-2026-90048 9.8 CRITICAL fs/ntfs3: fix slab-out-of-bounds write in ni_create_attr_list()
CVE-2026-90012 9.8 CRITICAL spi: Fix DMA mapping ownership on partial map failure
CVE-2026-89970 9.8 CRITICAL nvmet-auth: Synchronize timeout work during SQ teardown
CVE-2026-89857 9.8 CRITICAL scsi: qla2xxx: Hold qpair lock when sending NVMe LS reject
CVE-2026-89969 9.8 CRITICAL nvmet-tcp: fix out-of-bounds write when receiving an over-long PDU
CVE-2026-89847 9.8 CRITICAL scsi: qla2xxx: Avoid double completion in async IOCB timeout
CVE-2026-89972 9.8 CRITICAL nvme: add missing SRCU grace period in error path
CVE-2026-89990 9.8 CRITICAL ceph: lock mutex in ceph_mds_check_access()
CVE-2026-90036 9.8 CRITICAL NFSD: Prevent client use-after-free during blocked-lock reaping
CVE-2026-90038 9.8 CRITICAL NFSD: Prevent client use-after-free during export state revocation
CVE-2026-90037 9.8 CRITICAL NFSD: Prevent client use-after-free during close_lru reaping
CVE-2026-89788 9.8 CRITICAL ksmbd: fix tree connection use-after-free in smb2_tree_connect()
CVE-2026-89783 9.8 CRITICAL xfrm6: fix out-of-bounds write in xfrm6_input_addr() when secpath is full
CVE-2026-90042 9.8 CRITICAL ceph: properly decrypt filenames in vmalloc() buffers
CVE-2026-89778 9.8 CRITICAL isofs: fix out-of-bounds page array access on empty zisofs block
CVE-2026-89915 9.3 CRITICAL KVM: arm64: Remove VM-wide VNCR mapping counter
CVE-2026-90049 9.3 CRITICAL net: skbuff: don't skb_tx_error() the source skb in skb_zerocopy()
CVE-2026-89775 9.3 CRITICAL KVM: arm64: Handle negative S1 walk levels in VNCR TLB size evaluation
CVE-2026-89916 9.3 CRITICAL KVM: arm64: Make VNCR invalidation participate in MMU invalidation retry
CVE-2026-89930 9.3 CRITICAL KVM: nVMX: Service local TLB flushes on failed nested VM-Enter

Showing top 20 of 276 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

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