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CVE-2026-98413— selinux: always fill AVC decision in avc_has_perm_noaudit()

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： selinux：始终在 avc_has_perm_noaudit() 中填充 AVC 决策 文档说明 应将访问决策的副本返回到 中。然而，当请求的权限集合为空时，该函数会提前返回，导致缓冲区未被填充。所有调用方均传递一个未初始化的栈变量，随后将其传递给 ，且 inode 钩子甚至将其存储到每任务决策缓存中。 为此，修复方案类似于 ，填充一个“全部拒绝、全部审计”的决策，以确保每个调用方在热路径上无需额外开销即可获得已定义的返回值。

AI Predicted 5.3 Difficulty: Theoretical EPSS 0.22% · P12

Possible ATT&CK Techniques 1 AI

T1548.002 · Bypass User Account Control

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux e6f2f381e4015386a656a369835f949c26000e6b< c781e737aa0de95289b1774d5fd29388895737a9 affected
e6f2f381e4015386a656a369835f949c26000e6b< e308c5acfe283a66627fc407065626df4ab753ec affected
e6f2f381e4015386a656a369835f949c26000e6b< f9da796fa238f8e4414ee8481e6c979759a3d563 affected
e6f2f381e4015386a656a369835f949c26000e6b< e77461af13eab5c9a953cc52ec8432cc941d61e2 affected
e6f2f381e4015386a656a369835f949c26000e6b< 5a6f9a872b4ff68877caf998bee352153b7154bc affected
e6f2f381e4015386a656a369835f949c26000e6b< 24e00850bcff46b984f4c44b92e5499450fcfb5a affected
e6f2f381e4015386a656a369835f949c26000e6b< 835133337c2ce200db56f62d018c79087dee2603 affected
e6f2f381e4015386a656a369835f949c26000e6b< 8861db305103107199b1426f25fde1fb6d465583 affected
… +10 more rows
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I. Basic Information for CVE-2026-98413

Vulnerability Information
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Vulnerability Title
selinux: always fill AVC decision in avc_has_perm_noaudit()
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: selinux: always fill AVC decision in avc_has_perm_noaudit() avc_has_perm_noaudit() is documented to return a copy of the access decision in @avd, but its early return for an empty requested permission set leaves the buffer untouched. All callers pass an uninitialized stack variable and afterwards feed it to avc_audit(), and the inode hook even stores it in the per-task decision cache. Fill in a deny-all, audit-all decision, similar to avd_init(), so every caller receives a defined value at no cost on the hot path.
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

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux e6f2f381e4015386a656a369835f949c26000e6b ~ c781e737aa0de95289b1774d5fd29388895737a9 -
Linux Linux 5.1 -

II. Public POCs for CVE-2026-98413

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III. Intelligence Information for CVE-2026-98413

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Other References for CVE-2026-98413 (7)

Same Patch Batch · Linux · 2026-10-14 · 46 CVEs total

CVE-2026-98398 locking/lockdep: Invalidate stale class_cache entries for zapped classes
CVE-2026-98396 powerpc: Do not restore KUAP in arch_exit_to_user_mode_prepare()
CVE-2026-98393 net: ipv4: Fix UDP length overflow with PMTU discover and big MTU
CVE-2026-98391 drm/xe: Guard page-fault worker with runtime PM check
CVE-2026-98389 drm/amdgpu: skip gfx switch_power_profile during GPU reset
CVE-2026-98388 exec: do_close_on_exec() before taking exec_update_lock
CVE-2026-98387 s390/crypto: Fix skcipher_walk return code handling in aes_s390
CVE-2026-98386 scsi: qla2xxx: Use memset_io() to clear QLAFX00 request ring slot
CVE-2026-98390 x86/amd_node: Avoid divide by zero on virtualized systems
CVE-2026-98397 platform/x86: x86-android-tablets: hold device reference for secondary fwnode teardown
CVE-2026-98395 powerpc/entry: Fix irq_soft_mask corruption on replayed interrupt exit
CVE-2026-98399 s390/ipl: Fix NULL deref in dump_reipl without re-IPL parm block
CVE-2026-98400 s390/ipl: Fix NULL deref in kdump without re-IPL parm block
CVE-2026-98402 net: icmp: avoid invalid transport header access in icmp_send tracepoint
CVE-2026-98401 net: iptunnel: fix stale transport header during tunnel decapsulation
CVE-2026-98403 s390/boot: Avoid IPL parameter append past command line
CVE-2026-98404 drm/virtio: Fix a NULL vs ERR_PTR() bug in virtio_gpu_user_framebuffer_create()
CVE-2026-98405 smb: client: fix missing iov bounds check in parse_posix_sids()
CVE-2026-98406 wifi: mac80211: avoid WARN in set_bitrate_mask when sdata not in driver
CVE-2026-98408 watchdog: rzv2h: Avoid division by zero

Showing top 20 of 46 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-98413

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