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CVE-2026-46182— pseries/papr-hvpipe: Prevent kernel stack memory leak to userspace

AI Predicted 4.4 Difficulty: Easy EPSS 0.02% · P4

Possible ATT&CK Techniques 1AI

T1005 · Data from Local System

Affected Version Matrix 8

VendorProductVersion RangeStatus
LinuxLinuxcebdb522fd3edd1fe05f7b4a74a27da7dd0f8d86< 0479b6e9f999cc1cbad7d9f09f574fc387e605d5affected
cebdb522fd3edd1fe05f7b4a74a27da7dd0f8d86< f88f8e4485b437e0a2f96a7ff1f88aa22d925659affected
cebdb522fd3edd1fe05f7b4a74a27da7dd0f8d86< cefeed44296261173a806bef988b26bc565da4beaffected
6.18affected
< 6.18unaffected
6.18.30≤ 6.18.*unaffected
7.0.7≤ 7.0.*unaffected
7.1-rc3≤ *unaffected
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I. Basic Information for CVE-2026-46182

Vulnerability Information
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Vulnerability Title
pseries/papr-hvpipe: Prevent kernel stack memory leak to userspace
Source: NVD (National Vulnerability Database)
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: pseries/papr-hvpipe: Prevent kernel stack memory leak to userspace The hdr variable is allocated on the stack and only hdr.version and hdr.flags are initialized explicitly. Because the struct papr_hvpipe_hdr contains reserved padding bytes (reserved[3] and reserved2[40]), these could leak the uninitialized bytes to userspace after copy_to_user(). This patch fixes that by initializing the whole struct to 0.
Source: NVD (National Vulnerability Database)
CVSS Information
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Type
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于pseries papr-hvpipe中内核栈内存泄露给用户空间，可能导致未初始化字节泄露。
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

VendorProductAffected VersionsCPESubscribe
LinuxLinux cebdb522fd3edd1fe05f7b4a74a27da7dd0f8d86 ~ 0479b6e9f999cc1cbad7d9f09f574fc387e605d5 -
LinuxLinux 6.18 -

II. Public POCs for CVE-2026-46182

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III. Intelligence Information for CVE-2026-46182

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Patches & Fixes for CVE-2026-46182 (3)

Same Patch Batch · Linux · 2026-05-28 · 138 CVEs total

CVE-2026-461359.8 CRITICALnvmet-tcp: fix race between ICReq handling and queue teardown
CVE-2026-461379.8 CRITICALmptcp: pm: ADD_ADDR rtx: fix potential data-race
CVE-2026-461959.8 CRITICALsmb: client: validate dacloffset before building DACL pointers
CVE-2026-461159.8 CRITICALblock: add pgmap check to biovec_phys_mergeable
CVE-2026-461199.1 CRITICALlibceph: Fix slab-out-of-bounds access in auth message processing
CVE-2026-461859.1 CRITICALsmb/client: fix out-of-bounds read in symlink_data()
CVE-2026-461559.1 CRITICALsmb/client: fix out-of-bounds read in smb2_compound_op()
CVE-2026-461988.8 HIGHbatman-adv: fix integer overflow on buff_pos
CVE-2026-462128.8 HIGHbatman-adv: bla: prevent use-after-free when deleting claims
CVE-2026-461748.8 HIGHx86/CPU/AMD: Prevent improper isolation of shared resources in Zen2's op cache
CVE-2026-461528.8 HIGHwifi: mac80211: drop stray 'static' from fast-RX rx_result
CVE-2026-462388.8 HIGHbatman-adv: stop caching unowned originator pointers in BAT IV
CVE-2026-461258.8 HIGHwifi: mac80211: remove station if connection prep fails
CVE-2026-461668.8 HIGHwifi: mac80211: use safe list iteration in radar detect work
CVE-2026-461138.8 HIGHKVM: x86: Fix shadow paging use-after-free due to unexpected GFN
CVE-2026-461388.1 HIGHBluetooth: hci_event: Fix OOB read and infinite loop in hci_le_create_big_complete_evt
CVE-2026-462328.1 HIGHHID: playstation: Clamp num_touch_reports
CVE-2026-461457.8 HIGHRDMA/mana: Validate rx_hash_key_len
CVE-2026-461817.8 HIGHRDMA/mlx4: Fix mis-use of RCU in mlx4_srq_event()
CVE-2026-462017.8 HIGHdrm/xe: Fix dma-buf attachment leak in xe_gem_prime_import()

Showing top 20 of 138 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-46182

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