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CVE-2022-48991— mm/khugepaged: invoke MMU notifiers in shmem/file collapse paths

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mm/khugepaged子系统中未正确调用MMU通知器，可能导致次级MMU访问不再映射的页面。

CVSS 8.8 · High EPSS 0.25% · P16

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux f3f0e1d2150b2b99da2cbdfaad000089efe9bf30< 275c626c131cfe141beeb6c575e31fa53d32da19 affected
f3f0e1d2150b2b99da2cbdfaad000089efe9bf30< c23105673228c349739e958fa33955ed8faddcaf affected
f3f0e1d2150b2b99da2cbdfaad000089efe9bf30< ff2a1a6f869650aec99e9d070b5ab625bfbc5bc3 affected
f3f0e1d2150b2b99da2cbdfaad000089efe9bf30< 5ffc2a75534d9d74d49760f983f8eb675fa63d69 affected
f3f0e1d2150b2b99da2cbdfaad000089efe9bf30< 7f445ca2e0e59c7971d0b7b853465e50844ab596 affected
f3f0e1d2150b2b99da2cbdfaad000089efe9bf30< 1a3f8c6cd29d9078cc81b29d39d0e9ae1d6a03c3 affected
f3f0e1d2150b2b99da2cbdfaad000089efe9bf30< 5450535901d89a5dcca5fbbc59a24fe89caeb465 affected
f3f0e1d2150b2b99da2cbdfaad000089efe9bf30< f268f6cf875f3220afc77bdd0bf1bb136eb54db9 affected
… +10 more rows
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I. Basic Information for CVE-2022-48991

Vulnerability Information
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Vulnerability Title
mm/khugepaged: invoke MMU notifiers in shmem/file collapse paths
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: mm/khugepaged: invoke MMU notifiers in shmem/file collapse paths Any codepath that zaps page table entries must invoke MMU notifiers to ensure that secondary MMUs (like KVM) don't keep accessing pages which aren't mapped anymore. Secondary MMUs don't hold their own references to pages that are mirrored over, so failing to notify them can lead to page use-after-free. I'm marking this as addressing an issue introduced in commit f3f0e1d2150b ("khugepaged: add support of collapse for tmpfs/shmem pages"), but most of the security impact of this only came in commit 27e1f8273113 ("khugepaged: enable collapse pmd for pte-mapped THP"), which actually omitted flushes for the removal of present PTEs, not just for the removal of empty page tables.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
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mm/khugepaged子系统中未正确调用MMU通知器，可能导致次级MMU访问不再映射的页面。
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 f3f0e1d2150b2b99da2cbdfaad000089efe9bf30 ~ 275c626c131cfe141beeb6c575e31fa53d32da19 -
Linux Linux 4.8 -

II. Public POCs for CVE-2022-48991

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III. Intelligence Information for CVE-2022-48991

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Patches & Fixes for CVE-2022-48991 (3)

Same Patch Batch · Linux · 2024-10-21 · 372 CVEs total

CVE-2024-49855 9.8 CRITICAL nbd: fix race between timeout and normal completion
CVE-2024-50033 9.8 CRITICAL slip: make slhc_remember() more robust against malicious packets
CVE-2024-50043 9.8 CRITICAL nfsd: fix possible badness in FREE_STATEID
CVE-2024-50047 9.8 CRITICAL smb: client: fix UAF in async decryption
CVE-2024-50046 9.8 CRITICAL NFSv4: Prevent NULL-pointer dereference in nfs42_complete_copies()
CVE-2024-47695 9.8 CRITICAL RDMA/rtrs-clt: Reset cid to con_num - 1 to stay in bounds
CVE-2022-48985 9.8 CRITICAL net: mana: Fix race on per-CQ variable napi work_done
CVE-2022-49003 9.8 CRITICAL nvme: fix SRCU protection of nvme_ns_head list
CVE-2024-49996 9.4 CRITICAL cifs: Fix buffer overflow when parsing NFS reparse points
CVE-2024-47678 9.4 CRITICAL icmp: change the order of rate limits
CVE-2024-49936 8.8 HIGH net/xen-netback: prevent UAF in xenvif_flush_hash()
CVE-2022-48964 8.8 HIGH ravb: Fix potential use-after-free in ravb_rx_gbeth()
CVE-2022-48962 8.8 HIGH net: hisilicon: Fix potential use-after-free in hisi_femac_rx()
CVE-2022-49015 8.8 HIGH net: hsr: Fix potential use-after-free
CVE-2022-48954 8.8 HIGH s390/qeth: fix use-after-free in hsci
CVE-2024-50029 8.8 HIGH Bluetooth: hci_conn: Fix UAF in hci_enhanced_setup_sync
CVE-2024-50041 8.8 HIGH i40e: Fix macvlan leak by synchronizing access to mac_filter_hash
CVE-2024-49950 8.8 HIGH Bluetooth: L2CAP: Fix uaf in l2cap_connect
CVE-2024-49939 8.8 HIGH wifi: rtw89: avoid to add interface to list twice when SER
CVE-2024-49930 8.8 HIGH wifi: ath11k: fix array out-of-bound access in SoC stats

Showing top 20 of 372 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2022-48991

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