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CVE-2024-39482— bcache: fix variable length array abuse in btree_iter

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，该漏洞源于数组的索引超出了动态大小迭代器的界限，从而导致 UBSAN 抱怨。

CVSS 7.8 · High EPSS 0.24% · P14

Affected Version Matrix 14

VendorProduct Version RangeStatus
Linux Linux cafe563591446cf80bfbc2fe3bc72a2e36cf1060< 2c3d7b03b658dc8bfa6112b194b67b92a87e081b affected
cafe563591446cf80bfbc2fe3bc72a2e36cf1060< 5a1922adc5798b7ec894cd3f197afb6f9591b023 affected
cafe563591446cf80bfbc2fe3bc72a2e36cf1060< 934e1e4331859183a861f396d7dfaf33cb5afb02 affected
cafe563591446cf80bfbc2fe3bc72a2e36cf1060< 6479b9f41583b013041943c4602e1ad61cec8148 affected
cafe563591446cf80bfbc2fe3bc72a2e36cf1060< 0c31344e22dd8d6b1394c6e4c41d639015bdc671 affected
cafe563591446cf80bfbc2fe3bc72a2e36cf1060< 3a861560ccb35f2a4f0a4b8207fa7c2a35fc7f31 affected
3.10 affected
< 3.10 unaffected
… +6 more rows
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I. Basic Information for CVE-2024-39482

Vulnerability Information
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Vulnerability Title
bcache: fix variable length array abuse in btree_iter
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: bcache: fix variable length array abuse in btree_iter btree_iter is used in two ways: either allocated on the stack with a fixed size MAX_BSETS, or from a mempool with a dynamic size based on the specific cache set. Previously, the struct had a fixed-length array of size MAX_BSETS which was indexed out-of-bounds for the dynamically-sized iterators, which causes UBSAN to complain. This patch uses the same approach as in bcachefs's sort_iter and splits the iterator into a btree_iter with a flexible array member and a btree_iter_stack which embeds a btree_iter as well as a fixed-length data array.
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，该漏洞源于数组的索引超出了动态大小迭代器的界限，从而导致 UBSAN 抱怨。
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 cafe563591446cf80bfbc2fe3bc72a2e36cf1060 ~ 2c3d7b03b658dc8bfa6112b194b67b92a87e081b -
Linux Linux 3.10 -

II. Public POCs for CVE-2024-39482

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III. Intelligence Information for CVE-2024-39482

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Other References for CVE-2024-39482 (4)

Same Patch Batch · Linux · 2024-07-05 · 14 CVEs total

CVE-2024-39480 8.4 HIGH kdb: Fix buffer overflow during tab-complete
CVE-2024-39481 7.8 HIGH media: mc: Fix graph walk in media_pipeline_start
CVE-2024-39479 7.8 HIGH drm/i915/hwmon: Get rid of devm
CVE-2024-39478 7.8 HIGH crypto: starfive - Do not free stack buffer
CVE-2024-39477 7.8 HIGH mm/hugetlb: do not call vma_add_reservation upon ENOMEM
CVE-2024-39472 7.3 HIGH xfs: fix log recovery buffer allocation for the legacy h_size fixup
CVE-2024-39483 7.1 HIGH KVM: SVM: WARN on vNMI + NMI window iff NMIs are outright masked
CVE-2024-39485 media: v4l: async: Properly re-initialise notifier entry in unregister
CVE-2024-39484 mmc: davinci: Don't strip remove function when driver is builtin
CVE-2024-39476 md/raid5: fix deadlock that raid5d() wait for itself to clear MD_SB_CHANGE_PENDING
CVE-2024-39475 fbdev: savage: Handle err return when savagefb_check_var failed
CVE-2024-39474 mm/vmalloc: fix vmalloc which may return null if called with __GFP_NOFAIL
CVE-2024-39473 ASoC: SOF: ipc4-topology: Fix input format query of process modules without base extension

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2024-39482

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