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CVE-2026-80843— xfrm: fix xfrm_state_construct() auth-trunc leak

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xfrm_state_construct()函数对认证算法状态判断逻辑错误，attach_auth_trunc()分配x->aalg后未正确识别，导致后续attach_auth()覆盖先前的分配，可能造成内存泄漏。

AI Predicted 5.0 Difficulty: Hard EPSS 0.19% · P9

Affected Version Matrix 20

VendorProduct Version RangeStatus
Linux Linux 4447bb33f09444920a8f1d89e1540137429351b6< 958ae9f261319e1cdc44879886bcda2263258cca affected
4447bb33f09444920a8f1d89e1540137429351b6< fb7f3e74789a3c89647f4eb768f6dfaf4a751e72 affected
4447bb33f09444920a8f1d89e1540137429351b6< ba0c110c205855b3f1e3130d8c0fdb484d704c8c affected
4447bb33f09444920a8f1d89e1540137429351b6< c8837bbe792257af547fd1c0252553ce13148795 affected
4447bb33f09444920a8f1d89e1540137429351b6< 71d42da01740ec6557837bebec0bc48cfc3b4c39 affected
4447bb33f09444920a8f1d89e1540137429351b6< cf67361e78dca488d6e4df8396a53e6745a3a80e affected
4447bb33f09444920a8f1d89e1540137429351b6< 37426395cb90ef217beec8407a14bd82153793d3 affected
4447bb33f09444920a8f1d89e1540137429351b6< be19d20e53a239572bb2a28efcc1cd2b069b1ef9 affected
… +12 more rows
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I. Basic Information for CVE-2026-80843

Vulnerability Information
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Vulnerability Title
xfrm: fix xfrm_state_construct() auth-trunc leak
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: xfrm: fix xfrm_state_construct() auth-trunc leak attach_auth_trunc() can allocate x->aalg while leaving x->props.aalgo at zero when the selected auth algorithm has no sadb_alg_id. One real case is cmac(aes). xfrm_state_construct() then treats !x->props.aalgo as "no auth algorithm attached yet" and calls attach_auth(). That overwrites x->aalg and loses the first allocation. Any later failure or teardown only frees the replacement pointer. Check whether x->aalg is already attached instead of inferring that state from x->props.aalgo.
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xfrm_state_construct()函数对认证算法状态判断逻辑错误，attach_auth_trunc()分配x->aalg后未正确识别，导致后续attach_auth()覆盖先前的分配，可能造成内存泄漏。
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 4447bb33f09444920a8f1d89e1540137429351b6 ~ 958ae9f261319e1cdc44879886bcda2263258cca -
Linux Linux 2.6.33 -

II. Public POCs for CVE-2026-80843

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III. Intelligence Information for CVE-2026-80843

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Patches & Fixes for CVE-2026-80843 (9)

Same Patch Batch · Linux · 2026-09-04 · 156 CVEs total

CVE-2026-80865 bpf: Add missing access_ok call to copy_user_syms
CVE-2026-80856 fuse: fix invalidate lock leak on setattr writeback failure
CVE-2026-80857 fuse: wait for FR_FINISHED on abort_on_kill to prevent use-after-free
CVE-2026-80858 fuse: publish io-uring queues with release semantics
CVE-2026-80859 fuse: fix missing barrier when checking io-uring readiness
CVE-2026-80860 fuse: fix race between interrupt and resend
CVE-2026-80861 usb: xhci: bail out of setup if the controller is inaccessible
CVE-2026-80862 nvme-tcp: fix usage of page_frag_cache
CVE-2026-80863 RDMA/rxe: Fix OOB in free_rd_atomic_resources()
CVE-2026-80864 RDMA/rxe: Fix responder UAF on IB_QP_MAX_DEST_RD_ATOMIC modify_qp
CVE-2026-80870 drm/amdkfd: Validate CRIU-restored IDs before idr_alloc
CVE-2026-80874 arm64: dts: renesas: ironhide: Describe inline ECC carveouts
CVE-2026-80873 KVM: arm64: nv: Write ESR_EL2 for injected nested SError exceptions
CVE-2026-80872 ALSA: hda/tas2781: Cancel async firmware request at unbind
CVE-2026-80871 crypto: xilinx-trng - Remove crypto_rng interface
CVE-2026-80868 ntfs3: Allocate iomap inline_data using alloc_page
CVE-2026-80866 tipc: avoid busy looping in tipc_exit_net()
CVE-2026-80867 alpha/PCI: Add security_locked_down() check to pci_mmap_resource()
CVE-2026-80855 fuse: fix invalidate lock leak on open O_TRUNC DAX failure
CVE-2026-80869 ntfs: bound the attribute-list entry in ntfs_read_inode_mount()

Showing top 20 of 156 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

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