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CVE-2024-56739— rtc: check if __rtc_read_time was successful in rtc_timer_do_work()

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rtc模块中__rtc_read_time函数失败时的 rtc_time结构体可能包含未初始化数据或非法日期/时间。

AI Predicted 4.4 Difficulty: Moderate EPSS 0.23% · P13

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service

Affected Version Matrix 20

VendorProduct Version RangeStatus
Linux Linux 6610e0893b8bc6f59b14fed7f089c5997f035f88< 39ad0a1ae17b54509cd9e93dcd8cec16e7c12d3f affected
6610e0893b8bc6f59b14fed7f089c5997f035f88< 44b3257ff705d63d5f00ef8ed314a0eeb7ec37f2 affected
6610e0893b8bc6f59b14fed7f089c5997f035f88< 0d68e8514d9040108ff7d1b37ca71096674b6efe affected
6610e0893b8bc6f59b14fed7f089c5997f035f88< 246f621d363988e7040f4546d20203dc713fa3e1 affected
6610e0893b8bc6f59b14fed7f089c5997f035f88< fde56535505dde3336df438e949ef4742b6d6d6e affected
6610e0893b8bc6f59b14fed7f089c5997f035f88< dd4b1cbcc916fad5d10c2662b62def9f05e453d4 affected
6610e0893b8bc6f59b14fed7f089c5997f035f88< a1f0b4af90cc18b10261ecde56c6a56b22c75bd1 affected
6610e0893b8bc6f59b14fed7f089c5997f035f88< e77bce0a8c3989b4173c36f4195122bca8f4a3e1 affected
… +12 more rows
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I. Basic Information for CVE-2024-56739

Vulnerability Information
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Vulnerability Title
rtc: check if __rtc_read_time was successful in rtc_timer_do_work()
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: rtc: check if __rtc_read_time was successful in rtc_timer_do_work() If the __rtc_read_time call fails,, the struct rtc_time tm; may contain uninitialized data, or an illegal date/time read from the RTC hardware. When calling rtc_tm_to_ktime later, the result may be a very large value (possibly KTIME_MAX). If there are periodic timers in rtc->timerqueue, they will continually expire, may causing kernel softlockup.
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rtc模块中__rtc_read_time函数失败时的 rtc_time结构体可能包含未初始化数据或非法日期/时间。
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 6610e0893b8bc6f59b14fed7f089c5997f035f88 ~ 39ad0a1ae17b54509cd9e93dcd8cec16e7c12d3f -
Linux Linux 2.6.38 -

II. Public POCs for CVE-2024-56739

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III. Intelligence Information for CVE-2024-56739

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Patches & Fixes for CVE-2024-56739 (9)

Same Patch Batch · Linux · 2024-12-29 · 39 CVEs total

CVE-2024-56719 10.0 CRITICAL net: stmmac: fix TSO DMA API usage causing oops
CVE-2024-56718 9.8 CRITICAL net/smc: protect link down work from execute after lgr freed
CVE-2024-56720 7.8 HIGH bpf, sockmap: Several fixes to bpf_msg_pop_data
CVE-2024-56740 7.8 HIGH nfs/localio: must clear res.replen in nfs_local_read_done
CVE-2024-56709 7.8 HIGH io_uring: check if iowq is killed before queuing
CVE-2024-56715 7.8 HIGH ionic: Fix netdev notifier unregister on failure
CVE-2024-56717 7.5 HIGH net: mscc: ocelot: fix incorrect IFH SRC_PORT field in ocelot_ifh_set_basic()
CVE-2024-56749 7.5 HIGH dlm: fix dlm_recover_members refcount on error
CVE-2024-56721 7.1 HIGH x86/CPU/AMD: Terminate the erratum_1386_microcode array
CVE-2024-56756 nvme-pci: fix freeing of the HMB descriptor table
CVE-2024-56743 nfs_common: must not hold RCU while calling nfsd_file_put_local
CVE-2024-56745 PCI: Fix reset_method_store() memory leak
CVE-2024-56755 netfs/fscache: Add a memory barrier for FSCACHE_VOLUME_CREATING
CVE-2024-56744 f2fs: fix to avoid potential deadlock in f2fs_record_stop_reason()
CVE-2024-56746 fbdev: sh7760fb: Fix a possible memory leak in sh7760fb_alloc_mem()
CVE-2024-56748 scsi: qedf: Fix a possible memory leak in qedf_alloc_and_init_sb()
CVE-2024-56747 scsi: qedi: Fix a possible memory leak in qedi_alloc_and_init_sb()
CVE-2024-56750 erofs: fix blksize < PAGE_SIZE for file-backed mounts
CVE-2024-56727 octeontx2-pf: handle otx2_mbox_get_rsp errors in otx2_flows.c
CVE-2024-56754 crypto: caam - Fix the pointer passed to caam_qi_shutdown()

Showing top 20 of 39 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2024-56739

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