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CVE-2024-50015— ext4: dax: fix overflowing extents beyond inode size when partially writing

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ext4文件系统的DAX功能在部分写入操作时对超过inode大小的extent处理不当，可能导致fsck检查失败。

AI Predicted 3.3 Difficulty: Moderate EPSS 0.24% · P14

Affected Version Matrix 16

VendorProduct Version RangeStatus
Linux Linux 776722e85d3b0936253ecc3d14db4fba37f191ba< f8a7c342326f6ad1dfdb30a18dd013c70f5e9669 affected
776722e85d3b0936253ecc3d14db4fba37f191ba< 8c30a9a8610c314554997f86370140746aa35661 affected
776722e85d3b0936253ecc3d14db4fba37f191ba< abfaa876b948baaea4d14f21a1963789845c8b4c affected
776722e85d3b0936253ecc3d14db4fba37f191ba< 5efccdee4a7d507a483f20f880b809cc4eaef14d affected
776722e85d3b0936253ecc3d14db4fba37f191ba< a9f331f51515bdb3ebc8d0963131af367ef468f6 affected
776722e85d3b0936253ecc3d14db4fba37f191ba< ec0dd451e236c46e4858d53e9e82bae7797a7af5 affected
776722e85d3b0936253ecc3d14db4fba37f191ba< dda898d7ffe85931f9cca6d702a51f33717c501e affected
4.10 affected
… +8 more rows
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I. Basic Information for CVE-2024-50015

Vulnerability Information
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Vulnerability Title
ext4: dax: fix overflowing extents beyond inode size when partially writing
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: ext4: dax: fix overflowing extents beyond inode size when partially writing The dax_iomap_rw() does two things in each iteration: map written blocks and copy user data to blocks. If the process is killed by user(See signal handling in dax_iomap_iter()), the copied data will be returned and added on inode size, which means that the length of written extents may exceed the inode size, then fsck will fail. An example is given as: dd if=/dev/urandom of=file bs=4M count=1 dax_iomap_rw iomap_iter // round 1 ext4_iomap_begin ext4_iomap_alloc // allocate 0~2M extents(written flag) dax_iomap_iter // copy 2M data iomap_iter // round 2 iomap_iter_advance iter->pos += iter->processed // iter->pos = 2M ext4_iomap_begin ext4_iomap_alloc // allocate 2~4M extents(written flag) dax_iomap_iter fatal_signal_pending done = iter->pos - iocb->ki_pos // done = 2M ext4_handle_inode_extension ext4_update_inode_size // inode size = 2M fsck reports: Inode 13, i_size is 2097152, should be 4194304. Fix? Fix the problem by truncating extents if the written length is smaller than expected.
Source: CVE Program / CVE List V5
CVSS Information
N/A
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ext4文件系统的DAX功能在部分写入操作时对超过inode大小的extent处理不当，可能导致fsck检查失败。
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 776722e85d3b0936253ecc3d14db4fba37f191ba ~ f8a7c342326f6ad1dfdb30a18dd013c70f5e9669 -
Linux Linux 4.10 -

II. Public POCs for CVE-2024-50015

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III. Intelligence Information for CVE-2024-50015

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Patches & Fixes for CVE-2024-50015 (7)

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

CVE-2024-50033 9.8 CRITICAL slip: make slhc_remember() more robust against malicious packets
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-2022-49003 9.8 CRITICAL nvme: fix SRCU protection of nvme_ns_head list
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-2024-49996 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-2022-48962 8.8 HIGH net: hisilicon: Fix potential use-after-free in hisi_femac_rx()
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-2022-48967 8.8 HIGH NFC: nci: Bounds check struct nfc_target arrays
CVE-2022-48964 8.8 HIGH ravb: Fix potential use-after-free in ravb_rx_gbeth()
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-2024-50041 8.8 HIGH i40e: Fix macvlan leak by synchronizing access to mac_filter_hash
CVE-2024-49936 8.8 HIGH net/xen-netback: prevent UAF in xenvif_flush_hash()
CVE-2022-48954 8.8 HIGH s390/qeth: fix use-after-free in hsci

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-2024-50015

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