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CVE-2024-42102— Revert "mm/writeback: fix possible divide-by-zero in wb_dirty_limits(), again"

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/writeback模块中在wb_dirty_limits()中可能发生除以零的操作。

AI Predicted 6.5 Difficulty: Theoretical EPSS 0.26% · P16

Possible ATT&CK Techniques 1 AI

T1496 · Resource Hijacking

Affected Version Matrix 26

VendorProduct Version RangeStatus
Linux Linux c593d26fb5d577ef31b6e49a31e08ae3ebc1bc1e< 253f9ea7e8e53a5176bd80ceb174907b10724c1a affected
1f12e4b3284d6c863f272eb2de0d4248ed211cf4< 23a28f5f3f6ca1e4184bd0e9631cd0944cf1c807 affected
81e7d2530d458548b90a5c5e76b77ad5e5d1c0df< 145faa3d03688cbb7bbaaecbd84c01539852942c affected
5099871b370335809c0fd1abad74d9c7c205d43f< 2820005edae13b140f2d54267d1bd6bb23915f59 affected
16b1025eaa8fc223ab4273ece20d1c3a4211a95d< cbbe17a324437c0ff99881a3ee453da45b228a00 affected
ec18ec230301583395576915d274b407743d8f6c< f6620df12cb6bdcad671d269debbb23573502f9d affected
9319b647902cbd5cc884ac08a8a6d54ce111fc78< 000099d71648504fb9c7a4616f92c2b70c3e44ec affected
9319b647902cbd5cc884ac08a8a6d54ce111fc78< 30139c702048f1097342a31302cbd3d478f50c63 affected
… +18 more rows
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I. Basic Information for CVE-2024-42102

Vulnerability Information
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Vulnerability Title
Revert "mm/writeback: fix possible divide-by-zero in wb_dirty_limits(), again"
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: Revert "mm/writeback: fix possible divide-by-zero in wb_dirty_limits(), again" Patch series "mm: Avoid possible overflows in dirty throttling". Dirty throttling logic assumes dirty limits in page units fit into 32-bits. This patch series makes sure this is true (see patch 2/2 for more details). This patch (of 2): This reverts commit 9319b647902cbd5cc884ac08a8a6d54ce111fc78. The commit is broken in several ways. Firstly, the removed (u64) cast from the multiplication will introduce a multiplication overflow on 32-bit archs if wb_thresh * bg_thresh >= 1<<32 (which is actually common - the default settings with 4GB of RAM will trigger this). Secondly, the div64_u64() is unnecessarily expensive on 32-bit archs. We have div64_ul() in case we want to be safe & cheap. Thirdly, if dirty thresholds are larger than 1<<32 pages, then dirty balancing is going to blow up in many other spectacular ways anyway so trying to fix one possible overflow is just moot.
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mm/writeback模块中在wb_dirty_limits()中可能发生除以零的操作。
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 c593d26fb5d577ef31b6e49a31e08ae3ebc1bc1e ~ 253f9ea7e8e53a5176bd80ceb174907b10724c1a -
Linux Linux 6.8 -

II. Public POCs for CVE-2024-42102

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III. Intelligence Information for CVE-2024-42102

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Other References for CVE-2024-42102 (8)

Same Patch Batch · Linux · 2024-07-30 · 70 CVEs total

CVE-2024-42108 9.8 CRITICAL net: rswitch: Avoid use-after-free in rswitch_poll()
CVE-2024-42225 8.3 HIGH wifi: mt76: replace skb_put with skb_put_zero
CVE-2024-42162 7.8 HIGH gve: Account for stopped queues when reading NIC stats
CVE-2024-42117 7.8 HIGH drm/amd/display: ASSERT when failing to find index by plane/stream id
CVE-2024-42115 7.8 HIGH jffs2: Fix potential illegal address access in jffs2_free_inode
CVE-2024-42112 7.8 HIGH net: txgbe: free isb resources at the right time
CVE-2024-42111 7.8 HIGH btrfs: always do the basic checks for btrfs_qgroup_inherit structure
CVE-2024-42120 7.8 HIGH drm/amd/display: Check pipe offset before setting vblank
CVE-2024-42109 7.8 HIGH netfilter: nf_tables: unconditionally flush pending work before notifier
CVE-2024-42105 7.8 HIGH nilfs2: fix inode number range checks
CVE-2024-42104 7.8 HIGH nilfs2: add missing check for inode numbers on directory entries
CVE-2024-42103 7.8 HIGH btrfs: fix adding block group to a reclaim list and the unused list during reclaim
CVE-2024-42099 7.8 HIGH s390/dasd: Fix invalid dereferencing of indirect CCW data pointer
CVE-2024-42132 7.6 HIGH bluetooth/hci: disallow setting handle bigger than HCI_CONN_HANDLE_MAX
CVE-2024-42133 7.6 HIGH Bluetooth: Ignore too large handle values in BIG
CVE-2024-42152 7.5 HIGH nvmet: fix a possible leak when destroy a ctrl during qp establishment
CVE-2024-42110 7.5 HIGH net: ntb_netdev: Move ntb_netdev_rx_handler() to call netif_rx() from __netif_rx()
CVE-2024-42145 7.5 HIGH IB/core: Implement a limit on UMAD receive List
CVE-2024-42224 7.0 HIGH net: dsa: mv88e6xxx: Correct check for empty list
CVE-2024-42123 7.0 HIGH drm/amdgpu: fix double free err_addr pointer warnings

Showing top 20 of 70 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2024-42102

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