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CVE-2026-89765— timers/itimer: Zero-init old itimerval before copy to userspace

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 6.12.109之前版本、6.18.50之前版本和7.2.4之前版本存在安全漏洞，该漏洞源于在native sparc64上put_itimerval()未对栈分配的__kernel_old_itimerval进行零初始化，将包含填充空洞的整个对象拷贝到用户空间，导致getitimer()可能泄露内核栈信息。

AI Predicted 4.5 Difficulty: Hard EPSS 0.20% · P9

Possible ATT&CK Techniques 1 AI

T1012 · Query Registry

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< 6d4b937251386d9c6f968e7802f0cb16a8523772 affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< 4ea70146ab9376092297eb8b622ef1792797f2cf affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< a17b345daff46fec4af9f1ecbdf350208016dd15 affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< bdfda99c5763822a9a888e8af0ad7d9312ffcfe2 affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< 4c66719dd1e4023c5e3f7d050f1bbefec3dfbeb4 affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< 2bf5e8f7c9bf4ad3be343a9a6e3e50a34264d25e affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< 00ef529a5402f41eb1d227916437e237450719f9 affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< 18c7d85864e554adc8fad1e8d2e9d2cb6c3911c8 affected
… +10 more rows
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I. Basic Information for CVE-2026-89765

Vulnerability Information
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Vulnerability Title
timers/itimer: Zero-init old itimerval before copy to userspace
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: timers/itimer: Zero-init old itimerval before copy to userspace On native sparc64, struct __kernel_old_timeval contains a four-byte hole after tv_usec because tv_sec is 64-bit while __kernel_suseconds_t is 32-bit. put_itimerval() fills only the named fields in a stack-allocated __kernel_old_itimerval and copies the entire object to userspace, so getitimer() can expose the two padding holes. Zero-initialize the aggregate before assigning the fields so implicit padding is deterministic before it crosses the user/kernel boundary.
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 6.12.109之前版本、6.18.50之前版本和7.2.4之前版本存在安全漏洞，该漏洞源于在native sparc64上put_itimerval()未对栈分配的__kernel_old_itimerval进行零初始化，将包含填充空洞的整个对象拷贝到用户空间，导致getitimer()可能泄露内核栈信息。
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 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 ~ 6d4b937251386d9c6f968e7802f0cb16a8523772 -
Linux Linux 2.6.12 -

II. Public POCs for CVE-2026-89765

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III. Intelligence Information for CVE-2026-89765

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Patches & Fixes for CVE-2026-89765 (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-2026-89765

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