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CVE-2024-56769— media: dvb-frontends: dib3000mb: fix uninit-value in dib3000_write_reg

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，该漏洞源于在media模块的dvb-frontends/dib3000mb驱动中，dib3000_read_reg函数中使用了未初始化的局部变量rb作为读缓冲区，当i2c_transfer调用失败时，缓冲区可能包含未定义值，进而导致dib3000mb_attach函数中出现KMSAN报告的uninit-value错误，影响设备的正常工作和数据传输的可靠性。

AI Predicted 5.5 Difficulty: Moderate EPSS 0.23% · P13

Possible ATT&CK Techniques 1 AI

T1206

Affected Version Matrix 16

VendorProduct Version RangeStatus
Linux Linux 74340b0a8bc60b400c7e5fe4950303aa6f914d16< 035772fcd631eee2756b31cb6df249c0a8d453d7 affected
74340b0a8bc60b400c7e5fe4950303aa6f914d16< e11778189513cd7fb2edced5bd053bc18ede8418 affected
74340b0a8bc60b400c7e5fe4950303aa6f914d16< 53106510736e734ce8b731ba871363389bfbf4c9 affected
74340b0a8bc60b400c7e5fe4950303aa6f914d16< 3876e3a1c31a58a352c6bf5d2a90e3304445a637 affected
74340b0a8bc60b400c7e5fe4950303aa6f914d16< 1d6de21f00293d819b5ca6dbe75ff1f3b6392140 affected
74340b0a8bc60b400c7e5fe4950303aa6f914d16< c1197c1457bb7098cf46366e898eb52b41b6876a affected
74340b0a8bc60b400c7e5fe4950303aa6f914d16< 2dd59fe0e19e1ab955259978082b62e5751924c7 affected
2.6.19 affected
… +8 more rows
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I. Basic Information for CVE-2024-56769

Vulnerability Information
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Vulnerability Title
media: dvb-frontends: dib3000mb: fix uninit-value in dib3000_write_reg
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: media: dvb-frontends: dib3000mb: fix uninit-value in dib3000_write_reg Syzbot reports [1] an uninitialized value issue found by KMSAN in dib3000_read_reg(). Local u8 rb[2] is used in i2c_transfer() as a read buffer; in case that call fails, the buffer may end up with some undefined values. Since no elaborate error handling is expected in dib3000_write_reg(), simply zero out rb buffer to mitigate the problem. [1] Syzkaller report dvb-usb: bulk message failed: -22 (6/0) ===================================================== BUG: KMSAN: uninit-value in dib3000mb_attach+0x2d8/0x3c0 drivers/media/dvb-frontends/dib3000mb.c:758 dib3000mb_attach+0x2d8/0x3c0 drivers/media/dvb-frontends/dib3000mb.c:758 dibusb_dib3000mb_frontend_attach+0x155/0x2f0 drivers/media/usb/dvb-usb/dibusb-mb.c:31 dvb_usb_adapter_frontend_init+0xed/0x9a0 drivers/media/usb/dvb-usb/dvb-usb-dvb.c:290 dvb_usb_adapter_init drivers/media/usb/dvb-usb/dvb-usb-init.c:90 [inline] dvb_usb_init drivers/media/usb/dvb-usb/dvb-usb-init.c:186 [inline] dvb_usb_device_init+0x25a8/0x3760 drivers/media/usb/dvb-usb/dvb-usb-init.c:310 dibusb_probe+0x46/0x250 drivers/media/usb/dvb-usb/dibusb-mb.c:110 ... Local variable rb created at: dib3000_read_reg+0x86/0x4e0 drivers/media/dvb-frontends/dib3000mb.c:54 dib3000mb_attach+0x123/0x3c0 drivers/media/dvb-frontends/dib3000mb.c:758 ...
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，该漏洞源于在media模块的dvb-frontends/dib3000mb驱动中，dib3000_read_reg函数中使用了未初始化的局部变量rb作为读缓冲区，当i2c_transfer调用失败时，缓冲区可能包含未定义值，进而导致dib3000mb_attach函数中出现KMSAN报告的uninit-value错误，影响设备的正常工作和数据传输的可靠性。
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 74340b0a8bc60b400c7e5fe4950303aa6f914d16 ~ 035772fcd631eee2756b31cb6df249c0a8d453d7 -
Linux Linux 2.6.19 -

II. Public POCs for CVE-2024-56769

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III. Intelligence Information for CVE-2024-56769

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Patches & Fixes for CVE-2024-56769 (7)

Same Patch Batch · Linux · 2025-01-06 · 12 CVEs total

CVE-2024-56757 7.8 HIGH Bluetooth: btusb: mediatek: add intf release flow when usb disconnect
CVE-2024-56759 7.8 HIGH btrfs: fix use-after-free when COWing tree bock and tracing is enabled
CVE-2024-56764 7.8 HIGH ublk: detach gendisk from ublk device if add_disk() fails
CVE-2024-56765 7.8 HIGH powerpc/pseries/vas: Add close() callback in vas_vm_ops struct
CVE-2024-56758 btrfs: check folio mapping after unlock in relocate_one_folio()
CVE-2024-56760 PCI/MSI: Handle lack of irqdomain gracefully
CVE-2024-56761 x86/fred: Clear WFE in missing-ENDBRANCH #CPs
CVE-2024-56763 tracing: Prevent bad count for tracing_cpumask_write
CVE-2024-56767 dmaengine: at_xdmac: avoid null_prt_deref in at_xdmac_prep_dma_memset
CVE-2024-56766 mtd: rawnand: fix double free in atmel_pmecc_create_user()
CVE-2024-56768 bpf: Fix bpf_get_smp_processor_id() on !CONFIG_SMP

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2024-56769

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