CVE-2026-46118 (GCVE-0-2026-46118)

Vulnerability from cvelistv5 – Published: 2026-05-28 09:35 – Updated: 2026-06-14 17:55
VLAI
Title
pseries/papr-hvpipe: Fix null ptr deref in papr_hvpipe_dev_create_handle()
Summary
In the Linux kernel, the following vulnerability has been resolved: pseries/papr-hvpipe: Fix null ptr deref in papr_hvpipe_dev_create_handle() commit 6d3789d347a7 ("papr-hvpipe: convert papr_hvpipe_dev_create_handle() to FD_PREPARE()"), changed the create handle to FD_PREPARE(), but it caused kernel null-ptr-deref because after call to retain_and_null_ptr(src_info), src_info is re-used for adding it to the global list. Getting the following kernel panic in papr_hvpipe_dev_create_handle() when trying to add src_info to the list. Kernel attempted to write user page (0) - exploit attempt? (uid: 0) BUG: Kernel NULL pointer dereference on write at 0x00000000 Faulting instruction address: 0xc0000000001b44a0 Oops: Kernel access of bad area, sig: 11 [#1] ... Call Trace: papr_hvpipe_dev_ioctl+0x1f4/0x48c (unreliable) sys_ioctl+0x528/0x1064 system_call_exception+0x128/0x360 system_call_vectored_common+0x15c/0x2ec Now, the error handling with FD_PREPARE's file cleanup and __free(kfree) auto cleanup is getting too convoluted. This is mainly because we need to ensure only 1 user get the srcID handle. To simplify this, we allocate prepare the src_info in the beginning and add it to the global list under a spinlock after checking that no duplicates exist. This simplify the error handling where if the FD_ADD fails, we can simply remove the src_info from the list and consume any pending msg in hvpipe to be cleared, after src_info became visible in the global list.
Severity
5.5 (Medium)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 09c15bbbed533903e600660ea09098b3b0524f48 , < 735439394dde8462f9b50566727fbe333beaadaf (git)
Affected: 6d3789d347a7af5c4b0b2da3af47b8d9da607ab2 , < cf51bec1560f8bf115d1476f60335f9d90e110b0 (git)
Affected: 6d3789d347a7af5c4b0b2da3af47b8d9da607ab2 , < 1b9f7aafa44f5ce852c00509104d10fd9eb0f402 (git)
Affected: 6.18.32 , < 6.18.33 (semver)
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Linux Linux Affected: 6.19
Unaffected: 0 , < 6.19 (semver)
Unaffected: 6.18.33 , ≤ 6.18.* (semver)
Unaffected: 7.0.7 , ≤ 7.0.* (semver)
Unaffected: 7.1 , ≤ * (original_commit_for_fix)
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    "redhat_vex": {
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      "cve": "CVE-2026-46118",
      "id": "CVE-2026-46118",
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      "product_status:known_not_affected": "274",
      "source": "Red Hat CSAF VEX",
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      "title": "kernel: pseries/papr-hvpipe: Fix null ptr deref in papr_hvpipe_dev_create_handle()",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-46118.json",
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      "cve": "CVE-2026-46118",
      "id": "CVE-2026-46118",
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      "title": "SUSE CVE CVE-2026-46118",
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