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CVE-2024-49996— cifs: Fix buffer overflow when parsing NFS reparse points

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cifs子系统中在解析NFS重解析点时的缓冲区溢出，可能导致数据损坏。

CVSS 9.4 · Critical EPSS 0.79% · P55

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux d5ecebc4900df7f6e8dff0717574668885110553< 7b222d6cb87077faf56a687a72af1951cf78c8a9 affected
d5ecebc4900df7f6e8dff0717574668885110553< 73b078e3314d4854fd8286f3ba65c860ddd3a3dd affected
d5ecebc4900df7f6e8dff0717574668885110553< 01cdddde39b065074fd48f07027757783cbf5b7d affected
d5ecebc4900df7f6e8dff0717574668885110553< ec79e6170bcae8a6036a4b6960f5e7e59a785601 affected
d5ecebc4900df7f6e8dff0717574668885110553< c6db81c550cea0c73bd72ef55f579991e0e4ba07 affected
d5ecebc4900df7f6e8dff0717574668885110553< 803b3a39cb096d8718c0aebc03fd19f11c7dc919 affected
d5ecebc4900df7f6e8dff0717574668885110553< c173d47b69f07cd7ca08efb4e458adbd4725d8e9 affected
d5ecebc4900df7f6e8dff0717574668885110553< e2a8910af01653c1c268984855629d71fb81f404 affected
… +10 more rows
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I. Basic Information for CVE-2024-49996

Vulnerability Information
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Vulnerability Title
cifs: Fix buffer overflow when parsing NFS reparse points
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: cifs: Fix buffer overflow when parsing NFS reparse points ReparseDataLength is sum of the InodeType size and DataBuffer size. So to get DataBuffer size it is needed to subtract InodeType's size from ReparseDataLength. Function cifs_strndup_from_utf16() is currentlly accessing buf->DataBuffer at position after the end of the buffer because it does not subtract InodeType size from the length. Fix this problem and correctly subtract variable len. Member InodeType is present only when reparse buffer is large enough. Check for ReparseDataLength before accessing InodeType to prevent another invalid memory access. Major and minor rdev values are present also only when reparse buffer is large enough. Check for reparse buffer size before calling reparse_mkdev().
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/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cifs子系统中在解析NFS重解析点时的缓冲区溢出，可能导致数据损坏。
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 d5ecebc4900df7f6e8dff0717574668885110553 ~ 7b222d6cb87077faf56a687a72af1951cf78c8a9 -
Linux Linux 5.3 -

II. Public POCs for CVE-2024-49996

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III. Intelligence Information for CVE-2024-49996

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Patches & Fixes for CVE-2024-49996 (8)

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-2024-47695 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-2024-50046 9.8 CRITICAL NFSv4: Prevent NULL-pointer dereference in nfs42_complete_copies()
CVE-2024-50047 9.8 CRITICAL smb: client: fix UAF in async decryption
CVE-2024-50043 9.8 CRITICAL nfsd: fix possible badness in FREE_STATEID
CVE-2024-50033 9.8 CRITICAL slip: make slhc_remember() more robust against malicious packets
CVE-2022-49003 9.8 CRITICAL nvme: fix SRCU protection of nvme_ns_head list
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-2022-48960 8.8 HIGH net: hisilicon: Fix potential use-after-free in hix5hd2_rx()
CVE-2024-50029 8.8 HIGH Bluetooth: hci_conn: Fix UAF in hci_enhanced_setup_sync
CVE-2024-49930 8.8 HIGH wifi: ath11k: fix array out-of-bound access in SoC stats
CVE-2022-48954 8.8 HIGH s390/qeth: fix use-after-free in hsci
CVE-2024-47721 8.8 HIGH wifi: rtw89: remove unused C2H event ID RTW89_MAC_C2H_FUNC_READ_WOW_CAM to prevent out-of-
CVE-2024-49982 8.8 HIGH aoe: fix the potential use-after-free problem in more places
CVE-2024-49950 8.8 HIGH Bluetooth: L2CAP: Fix uaf in l2cap_connect
CVE-2024-47724 8.8 HIGH wifi: ath11k: use work queue to process beacon tx event

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-2024-49996

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