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CVE-2024-39496— btrfs: zoned: fix use-after-free due to race with dev replace

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 btrfs:zoned 组件在加载区域信息时，存在与设备替换操作的竞争条件问题，可能导致使用已释放的设备，触发释放后重用错误。

CVSS 7.8 · High EPSS 0.29% · P20

Possible ATT&CK Techniques 1 AI

T1610 · Deploy Container

Affected Version Matrix 10

VendorProduct Version RangeStatus
Linux Linux 5b316468983dfa9473ff0f1c42e4e30b4c267141< 17765964703b88d8befd899f8501150bb7e07e43 affected
5b316468983dfa9473ff0f1c42e4e30b4c267141< 092571ef9a812566c8f2c9038d9c2a64c49788d6 affected
5b316468983dfa9473ff0f1c42e4e30b4c267141< a0cc006f4214b87e70983c692e05bb36c59b5752 affected
5b316468983dfa9473ff0f1c42e4e30b4c267141< 0090d6e1b210551e63cf43958dc7a1ec942cdde9 affected
5.11 affected
< 5.11 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-2024-39496

Vulnerability Information
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Vulnerability Title
btrfs: zoned: fix use-after-free due to race with dev replace
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: btrfs: zoned: fix use-after-free due to race with dev replace While loading a zone's info during creation of a block group, we can race with a device replace operation and then trigger a use-after-free on the device that was just replaced (source device of the replace operation). This happens because at btrfs_load_zone_info() we extract a device from the chunk map into a local variable and then use the device while not under the protection of the device replace rwsem. So if there's a device replace operation happening when we extract the device and that device is the source of the replace operation, we will trigger a use-after-free if before we finish using the device the replace operation finishes and frees the device. Fix this by enlarging the critical section under the protection of the device replace rwsem so that all uses of the device are done inside the critical section.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/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 btrfs:zoned 组件在加载区域信息时，存在与设备替换操作的竞争条件问题，可能导致使用已释放的设备，触发释放后重用错误。
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 5b316468983dfa9473ff0f1c42e4e30b4c267141 ~ 17765964703b88d8befd899f8501150bb7e07e43 -
Linux Linux 5.11 -

II. Public POCs for CVE-2024-39496

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III. Intelligence Information for CVE-2024-39496

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Patches & Fixes for CVE-2024-39496 (1)

Other References for CVE-2024-39496 (3)

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-2024-40923 9.8 CRITICAL vmxnet3: disable rx data ring on dma allocation failure
CVE-2024-40907 9.8 CRITICAL ionic: fix kernel panic in XDP_TX action
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-2024-40911 8.8 HIGH wifi: cfg80211: Lock wiphy in cfg80211_get_station
CVE-2024-40910 8.8 HIGH ax25: Fix refcount imbalance on inbound connections
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-2024-39496

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