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CVE-2024-40935— cachefiles: flush all requests after setting CACHEFILES_DEAD

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 cachefiles 组件在设置 CACHEFILES_DEAD 后未能正确刷新所有请求。

AI Predicted 7.8 Difficulty: Hard EPSS 0.26% · P17

Affected Version Matrix 10

VendorProduct Version RangeStatus
Linux Linux c8383054506c77b814489c09877b5db83fd4abf2< 320ba9cbca78be79c912143bbba1d1b35ca55cf0 affected
c8383054506c77b814489c09877b5db83fd4abf2< 3bf0b8030296e9ee60d3d4c15849ad9ac0b47081 affected
c8383054506c77b814489c09877b5db83fd4abf2< e73fac95084839c5178d97e81c6a2051251bdc00 affected
c8383054506c77b814489c09877b5db83fd4abf2< 85e833cd7243bda7285492b0653c3abb1e2e757b affected
5.19 affected
< 5.19 unaffected
6.1.95≤ 6.1.* unaffected
6.6.35≤ 6.6.* unaffected
… +2 more rows
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I. Basic Information for CVE-2024-40935

Vulnerability Information
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Vulnerability Title
cachefiles: flush all requests after setting CACHEFILES_DEAD
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: cachefiles: flush all requests after setting CACHEFILES_DEAD In ondemand mode, when the daemon is processing an open request, if the kernel flags the cache as CACHEFILES_DEAD, the cachefiles_daemon_write() will always return -EIO, so the daemon can't pass the copen to the kernel. Then the kernel process that is waiting for the copen triggers a hung_task. Since the DEAD state is irreversible, it can only be exited by closing /dev/cachefiles. Therefore, after calling cachefiles_io_error() to mark the cache as CACHEFILES_DEAD, if in ondemand mode, flush all requests to avoid the above hungtask. We may still be able to read some of the cached data before closing the fd of /dev/cachefiles. Note that this relies on the patch that adds reference counting to the req, otherwise it may UAF.
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 cachefiles 组件在设置 CACHEFILES_DEAD 后未能正确刷新所有请求。
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 c8383054506c77b814489c09877b5db83fd4abf2 ~ 320ba9cbca78be79c912143bbba1d1b35ca55cf0 -
Linux Linux 5.19 -

II. Public POCs for CVE-2024-40935

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III. Intelligence Information for CVE-2024-40935

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Other References for CVE-2024-40935 (4)

Same Patch Batch · Linux · 2024-07-12 · 122 CVEs total

CVE-2024-40999 9.8 CRITICAL net: ena: Add validation for completion descriptors consistency
CVE-2024-40907 9.8 CRITICAL ionic: fix kernel panic in XDP_TX action
CVE-2024-40923 9.8 CRITICAL vmxnet3: disable rx data ring on dma allocation failure
CVE-2024-40983 9.8 CRITICAL tipc: force a dst refcount before doing decryption
CVE-2024-40937 9.8 CRITICAL gve: Clear napi->skb before dev_kfree_skb_any()
CVE-2024-40910 8.8 HIGH ax25: Fix refcount imbalance on inbound connections
CVE-2024-40911 8.8 HIGH wifi: cfg80211: Lock wiphy in cfg80211_get_station
CVE-2024-40941 8.1 HIGH wifi: iwlwifi: mvm: don't read past the mfuart notifcation
CVE-2024-40953 7.9 HIGH KVM: Fix a data race on last_boosted_vcpu in kvm_vcpu_on_spin()
CVE-2024-40954 7.8 HIGH net: do not leave a dangling sk pointer, when socket creation fails
CVE-2024-40918 7.8 HIGH parisc: Try to fix random segmentation faults in package builds
CVE-2024-40924 7.8 HIGH drm/i915/dpt: Make DPT object unshrinkable
CVE-2024-40925 7.8 HIGH block: fix request.queuelist usage in flush
CVE-2024-40943 7.8 HIGH ocfs2: fix races between hole punching and AIO+DIO
CVE-2024-40947 7.8 HIGH ima: Avoid blocking in RCU read-side critical section
CVE-2024-40949 7.8 HIGH mm: shmem: fix getting incorrect lruvec when replacing a shmem folio
CVE-2024-40990 7.8 HIGH RDMA/mlx5: Add check for srq max_sge attribute
CVE-2024-40986 7.8 HIGH dmaengine: xilinx: xdma: Fix data synchronisation in xdma_channel_isr()
CVE-2024-40989 7.8 HIGH KVM: arm64: Disassociate vcpus from redistributor region on teardown
CVE-2024-40984 7.8 HIGH ACPICA: Revert "ACPICA: avoid Info: mapping multiple BARs. Your kernel is fine."

Showing top 20 of 122 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2024-40935

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