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CVE-2026-80756— selinux: do not cancel a policy conversion that never started

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在首次加载策略且构建selinuxfs树失败时，取消了从未开始的策略转换，导致对空指针state->policy的取消引用，可能造成系统崩溃。

AI Predicted 5.5 Difficulty: Moderate EPSS 0.17% · P5

Possible ATT&CK Techniques 1 AI

T1560 · Archive Collected Data

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux 02a52c5c8c3b8cbad0f12009cde9f36dbefb6972< 2d29983104f06f5b0babcd5a25a0f0408272cd27 affected
02a52c5c8c3b8cbad0f12009cde9f36dbefb6972< a4f182f8715cb0819445f0850cd5436828f4bafc affected
02a52c5c8c3b8cbad0f12009cde9f36dbefb6972< 1059789ae9f99cbbe3a78e361e9c0976beb5958b affected
02a52c5c8c3b8cbad0f12009cde9f36dbefb6972< 1acc317d67a755a45e32419a15d70e403fa43f0e affected
02a52c5c8c3b8cbad0f12009cde9f36dbefb6972< a42932c6aa33d0aac683cacdf1ec7009b955ba5d affected
02a52c5c8c3b8cbad0f12009cde9f36dbefb6972< 1b4ff94ae7c580c880291519fb0e3e2bd075beef affected
02a52c5c8c3b8cbad0f12009cde9f36dbefb6972< 219c96de5d9b6b4af7e8576ad897b774cc3ee9a7 affected
02a52c5c8c3b8cbad0f12009cde9f36dbefb6972< e5c0235a3c4e9eb047a16cd02323fe4ecf2f570e affected
… +10 more rows
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I. Basic Information for CVE-2026-80756

Vulnerability Information
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Vulnerability Title
selinux: do not cancel a policy conversion that never started
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: selinux: do not cancel a policy conversion that never started sel_write_load() calls selinux_policy_cancel() when sel_make_policy_nodes() fails, and that helper dereferences the outgoing policy to cancel its sidtab conversion. On the first policy load there is no outgoing policy: security_load_policy() returns early for that case, before it converts anything, and state->policy is still NULL. A first load that fails while building the selinuxfs tree therefore takes a NULL dereference in selinux_policy_cancel(), reached from a write(2) to /sys/fs/selinux/load. Skip the cancel when there is no old policy, mirroring the check security_load_policy() already makes before it converts.
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在首次加载策略且构建selinuxfs树失败时，取消了从未开始的策略转换，导致对空指针state->policy的取消引用，可能造成系统崩溃。
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 02a52c5c8c3b8cbad0f12009cde9f36dbefb6972 ~ 2d29983104f06f5b0babcd5a25a0f0408272cd27 -
Linux Linux 5.10 -

II. Public POCs for CVE-2026-80756

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III. Intelligence Information for CVE-2026-80756

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Patches & Fixes for CVE-2026-80756 (8)

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-2026-80756

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