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CVE-2024-40913— cachefiles: defer exposing anon_fd until after copy_to_user() succeeds

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 copy_to_user 函数成功后未能正确延迟暴露匿名文件描述符。

AI Predicted 7.8 Difficulty: Moderate EPSS 0.29% · P20

Possible ATT&CK Techniques 2 AI

T1003 · OS Credential Dumping T1206

Affected Version Matrix 10

VendorProduct Version RangeStatus
Linux Linux c8383054506c77b814489c09877b5db83fd4abf2< eac51d9daacd61dcc93333ff6a890cf3efc8c1c0 affected
c8383054506c77b814489c09877b5db83fd4abf2< d2d3eb377a5d081bf2bed177d354a4f59b74da88 affected
c8383054506c77b814489c09877b5db83fd4abf2< b9f58cdae6a364a3270fd6b6a46e0fd4f7f8ce32 affected
c8383054506c77b814489c09877b5db83fd4abf2< 4b4391e77a6bf24cba2ef1590e113d9b73b11039 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-2024-40913

Vulnerability Information
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Vulnerability Title
cachefiles: defer exposing anon_fd until after copy_to_user() succeeds
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: cachefiles: defer exposing anon_fd until after copy_to_user() succeeds After installing the anonymous fd, we can now see it in userland and close it. However, at this point we may not have gotten the reference count of the cache, but we will put it during colse fd, so this may cause a cache UAF. So grab the cache reference count before fd_install(). In addition, by kernel convention, fd is taken over by the user land after fd_install(), and the kernel should not call close_fd() after that, i.e., it should call fd_install() after everything is ready, thus fd_install() is called after copy_to_user() succeeds.
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 copy_to_user 函数成功后未能正确延迟暴露匿名文件描述符。
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 ~ eac51d9daacd61dcc93333ff6a890cf3efc8c1c0 -
Linux Linux 5.19 -

II. Public POCs for CVE-2024-40913

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III. Intelligence Information for CVE-2024-40913

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Other References for CVE-2024-40913 (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-2024-40913

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