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CVE-2024-39480— kdb: Fix buffer overflow during tab-complete

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tab补全期间缓冲区溢出。

CVSS 8.4 · High EPSS 0.27% · P18

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux 5d5314d6795f3c1c0f415348ff8c51f7de042b77< fb824a99e148ff272a53d71d84122728b5f00992 affected
5d5314d6795f3c1c0f415348ff8c51f7de042b77< ddd2972d8e2dee3b33e8121669d55def59f0be8a affected
5d5314d6795f3c1c0f415348ff8c51f7de042b77< cfdc2fa4db57503bc6d3817240547c8ddc55fa96 affected
5d5314d6795f3c1c0f415348ff8c51f7de042b77< f636a40834d22e5e3fc748f060211879c056cd33 affected
5d5314d6795f3c1c0f415348ff8c51f7de042b77< 33d9c814652b971461d1e30bead6792851c209e7 affected
5d5314d6795f3c1c0f415348ff8c51f7de042b77< 107e825cc448b7834b31e8b1b3cf0f57426d46d5 affected
5d5314d6795f3c1c0f415348ff8c51f7de042b77< f694da720dcf795dc3eb97bf76d220213f76aaa7 affected
5d5314d6795f3c1c0f415348ff8c51f7de042b77< e9730744bf3af04cda23799029342aa3cddbc454 affected
… +10 more rows
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I. Basic Information for CVE-2024-39480

Vulnerability Information
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Vulnerability Title
kdb: Fix buffer overflow during tab-complete
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: kdb: Fix buffer overflow during tab-complete Currently, when the user attempts symbol completion with the Tab key, kdb will use strncpy() to insert the completed symbol into the command buffer. Unfortunately it passes the size of the source buffer rather than the destination to strncpy() with predictably horrible results. Most obviously if the command buffer is already full but cp, the cursor position, is in the middle of the buffer, then we will write past the end of the supplied buffer. Fix this by replacing the dubious strncpy() calls with memmove()/memcpy() calls plus explicit boundary checks to make sure we have enough space before we start moving characters around.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:N/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tab补全期间缓冲区溢出。
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 5d5314d6795f3c1c0f415348ff8c51f7de042b77 ~ fb824a99e148ff272a53d71d84122728b5f00992 -
Linux Linux 2.6.35 -

II. Public POCs for CVE-2024-39480

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III. Intelligence Information for CVE-2024-39480

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Other References for CVE-2024-39480 (7)

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

CVE-2024-39482 7.8 HIGH bcache: fix variable length array abuse in btree_iter
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-2024-39480

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