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CVE-2024-49958— ocfs2: reserve space for inline xattr before attaching reflink tree

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ocfs2文件系统在附加reflink树前未预留足够的空间给内联xattr。

CVSS 7.8 · High EPSS 0.27% · P19

Affected Version Matrix 30

VendorProduct Version RangeStatus
Linux Linux ef962df057aaafd714f5c22ba3de1be459571fdf< 5c9807c523b4fca81d3e8e864dabc8c806402121 affected
ef962df057aaafd714f5c22ba3de1be459571fdf< 74364cb578dcc0b6c9109519d19cbe5a56afac9a affected
ef962df057aaafd714f5c22ba3de1be459571fdf< aac31d654a0a31cb0d2fa36ae694f4e164a52707 affected
ef962df057aaafd714f5c22ba3de1be459571fdf< 020f5c53c17f66c0a8f2d37dad27ace301b8d8a1 affected
ef962df057aaafd714f5c22ba3de1be459571fdf< 5c2072f02c0d75802ec28ec703b7d43a0dd008b5 affected
ef962df057aaafd714f5c22ba3de1be459571fdf< 637c00e06564a945e9d0edb3d78d362d64935f9f affected
ef962df057aaafd714f5c22ba3de1be459571fdf< 9f9a8f3ac65b4147f1a7b6c05fad5192c0e3c3d9 affected
ef962df057aaafd714f5c22ba3de1be459571fdf< 96ce4c3537114d1698be635f5e36c62dc49df7a4 affected
… +22 more rows
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I. Basic Information for CVE-2024-49958

Vulnerability Information
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Vulnerability Title
ocfs2: reserve space for inline xattr before attaching reflink tree
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: ocfs2: reserve space for inline xattr before attaching reflink tree One of our customers reported a crash and a corrupted ocfs2 filesystem. The crash was due to the detection of corruption. Upon troubleshooting, the fsck -fn output showed the below corruption [EXTENT_LIST_FREE] Extent list in owner 33080590 claims 230 as the next free chain record, but fsck believes the largest valid value is 227. Clamp the next record value? n The stat output from the debugfs.ocfs2 showed the following corruption where the "Next Free Rec:" had overshot the "Count:" in the root metadata block. Inode: 33080590 Mode: 0640 Generation: 2619713622 (0x9c25a856) FS Generation: 904309833 (0x35e6ac49) CRC32: 00000000 ECC: 0000 Type: Regular Attr: 0x0 Flags: Valid Dynamic Features: (0x16) HasXattr InlineXattr Refcounted Extended Attributes Block: 0 Extended Attributes Inline Size: 256 User: 0 (root) Group: 0 (root) Size: 281320357888 Links: 1 Clusters: 141738 ctime: 0x66911b56 0x316edcb8 -- Fri Jul 12 06:02:30.829349048 2024 atime: 0x66911d6b 0x7f7a28d -- Fri Jul 12 06:11:23.133669517 2024 mtime: 0x66911b56 0x12ed75d7 -- Fri Jul 12 06:02:30.317552087 2024 dtime: 0x0 -- Wed Dec 31 17:00:00 1969 Refcount Block: 2777346 Last Extblk: 2886943 Orphan Slot: 0 Sub Alloc Slot: 0 Sub Alloc Bit: 14 Tree Depth: 1 Count: 227 Next Free Rec: 230 ## Offset Clusters Block# 0 0 2310 2776351 1 2310 2139 2777375 2 4449 1221 2778399 3 5670 731 2779423 4 6401 566 2780447 ....... .... ....... ....... .... ....... The issue was in the reflink workfow while reserving space for inline xattr. The problematic function is ocfs2_reflink_xattr_inline(). By the time this function is called the reflink tree is already recreated at the destination inode from the source inode. At this point, this function reserves space for inline xattrs at the destination inode without even checking if there is space at the root metadata block. It simply reduces the l_count from 243 to 227 thereby making space of 256 bytes for inline xattr whereas the inode already has extents beyond this index (in this case up to 230), thereby causing corruption. The fix for this is to reserve space for inline metadata at the destination inode before the reflink tree gets recreated. The customer has verified the fix.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/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ocfs2文件系统在附加reflink树前未预留足够的空间给内联xattr。
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 ef962df057aaafd714f5c22ba3de1be459571fdf ~ 5c9807c523b4fca81d3e8e864dabc8c806402121 -
Linux Linux 3.11 -

II. Public POCs for CVE-2024-49958

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III. Intelligence Information for CVE-2024-49958

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Patches & Fixes for CVE-2024-49958 (9)

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-2024-49996 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-2024-49939 8.8 HIGH wifi: rtw89: avoid to add interface to list twice when SER
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-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-2024-49930 8.8 HIGH wifi: ath11k: fix array out-of-bound access in SoC stats
CVE-2024-49982 8.8 HIGH aoe: fix the potential use-after-free problem in more places
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-2024-49950 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

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