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CVE-2026-80757— selinux: reject a class permission count below its inherited common

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SELinux类权限计数验证不足，可能导致越界堆写入。

AI Predicted 6.5 Difficulty: Hard EPSS 0.17% · P5

Possible ATT&CK Techniques 1 AI

T1203 · Exploitation for Client Execution

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux 55fcf09b3fe4325c9395ebbb0322a547a157ebc7< 2002ff745db64ac83ee1bb9ff78196d2d68bfdb3 affected
55fcf09b3fe4325c9395ebbb0322a547a157ebc7< 38d91446630a20ce8c2a981810deea81fd61a3b5 affected
55fcf09b3fe4325c9395ebbb0322a547a157ebc7< 638213f2e6ea52c06a25861616781338d154db35 affected
55fcf09b3fe4325c9395ebbb0322a547a157ebc7< 2b7ffd7921fcbfe408fb7b372e47454e45b1e6a7 affected
55fcf09b3fe4325c9395ebbb0322a547a157ebc7< a63011c009ea79439b800a05602b880eb4adbb05 affected
55fcf09b3fe4325c9395ebbb0322a547a157ebc7< acd5b09be98fd38b7392307880156fb0452a7276 affected
55fcf09b3fe4325c9395ebbb0322a547a157ebc7< 1b995966c3ae5244751bdaee9bfe7e17567d4fbe affected
55fcf09b3fe4325c9395ebbb0322a547a157ebc7< 9a82dcd98b6e6e11cfd162410967951f12152528 affected
… +10 more rows
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I. Basic Information for CVE-2026-80757

Vulnerability Information
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Vulnerability Title
selinux: reject a class permission count below its inherited common
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: selinux: reject a class permission count below its inherited common security_get_permissions() maps an inherited common's permissions into an array sized by the class's own permissions.nprim, but class_read() takes that nprim verbatim from the policy image and never checks that it covers the common. A class that inherits a common of N permissions while declaring a smaller nprim is accepted, and on load the common's permissions are written past the class-sized array -- an out-of-bounds heap write. Reject a class whose permission count is below its inherited common's. Well-formed policies, where the class count already includes the inherited permissions, are unaffected.
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存在安全漏洞，该漏洞源于SELinux类权限计数验证不足，可能导致越界堆写入。
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 55fcf09b3fe4325c9395ebbb0322a547a157ebc7 ~ 2002ff745db64ac83ee1bb9ff78196d2d68bfdb3 -
Linux Linux 2.6.23 -

II. Public POCs for CVE-2026-80757

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III. Intelligence Information for CVE-2026-80757

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Patches & Fixes for CVE-2026-80757 (7)

Other References for CVE-2026-80757 (1)

Same Patch Batch · Linux · 2026-09-03 · 32 CVEs total

CVE-2026-80726 9.3 CRITICAL KVM: x86/mmu: WARN and clear role.invalid when creating a child shadow page
CVE-2026-80734 8.8 HIGH btrfs: initialize inode mapping flags for cached inodes
CVE-2026-80753 8.4 HIGH ovpn: run deferred work on a module-owned workqueue
CVE-2026-80745 8.4 HIGH regulator: fp9931: Fix VPOS/VNEG voltage selector table
CVE-2026-80750 8.4 HIGH pmdomain: mediatek: fix remaining %pOF after of_node_put()
CVE-2026-80752 8.4 HIGH Input: psxpad-spi - set driver data before use
CVE-2026-80747 8.0 HIGH drm/amdkfd: Add bounds check for CRAT subtype length
CVE-2026-80751 7.8 HIGH pmdomain: mediatek: mfg: initialize prev_o in mtk_mfg_attach_dev()
CVE-2026-80748 7.8 HIGH mmc: loongson2: Fix sg iteration in data reorder functions
CVE-2026-80754 7.8 HIGH Input: synaptics-rmi4 - fix F55 transmitter electrode count typo
CVE-2026-80736 7.8 HIGH thunderbolt: Fix bandwidth group reservation indexing
CVE-2026-80731 7.8 HIGH net: remove CAP_SYS_RAWIO zero-padding in dev_validate_header
CVE-2026-80732 7.8 HIGH ata: pata_sl82c105: fix bridge revision use-after-free
CVE-2026-80737 7.8 HIGH serial: amba-pl011: synchronize DMA teardown
CVE-2026-80735 7.3 HIGH ovpn: ensure socket is owned by ovpn before deref sk_user_data
CVE-2026-80738 7.3 HIGH bpf: Check sk_state before sk_protocol in bpf_tcp_*_syncookie
CVE-2026-80749 7.1 HIGH drm/connector/hdmi: Fix out of bounds memory read
CVE-2026-80741 7.1 HIGH drm/log: Fix out-of-bounds read on empty message length
CVE-2026-80740 drm/log: Fix infinite loop when scale is too large for display
CVE-2026-80730 ring-buffer: Fix crash passing ERR_PTR to kthread_stop()

Showing top 20 of 32 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-80757

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