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CVE-2026-45838— bpf: fix end-of-list detection in cgroup_storage_get_next_key()

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cgroup_storage_get_next_key使用list_next_entry不会返回NULL，可能导致get_next_key对最后一个元素永远不返回-ENOENT而是从别名内部映射字段的虚假指针读取storage->key并复制到用户空间。

AI Predicted 7.8 Difficulty: Moderate EPSS 0.13% · P3

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux de9cbbaadba5adf88a19e46df61f7054000838f6< 0f3d9dd5e1fd52b39e25328307c6a694e994ffe3 affected
de9cbbaadba5adf88a19e46df61f7054000838f6< 26d3339e465e54107bd85884341d1609c5300d6a affected
de9cbbaadba5adf88a19e46df61f7054000838f6< 2c88b2d96e1d4d0c7c4589a4593d4cdee6d332d6 affected
de9cbbaadba5adf88a19e46df61f7054000838f6< b4b5a20bed82130da2f2818f04d52378952fbd0b affected
de9cbbaadba5adf88a19e46df61f7054000838f6< 85a2f30e40f7468db732f55659bc6318874f49af affected
de9cbbaadba5adf88a19e46df61f7054000838f6< 32ce55d424395904986f5066f8755f6cb9993377 affected
de9cbbaadba5adf88a19e46df61f7054000838f6< fc39753b7f92e09177777e9c648afe5aa3abb81f affected
de9cbbaadba5adf88a19e46df61f7054000838f6< 5828b9e5b272ecff7cf5d345128d3de7324117f7 affected
… +10 more rows
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I. Basic Information for CVE-2026-45838

Vulnerability Information
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Vulnerability Title
bpf: fix end-of-list detection in cgroup_storage_get_next_key()
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: bpf: fix end-of-list detection in cgroup_storage_get_next_key() list_next_entry() never returns NULL -- when the current element is the last entry it wraps to the list head via container_of(). The subsequent NULL check is therefore dead code and get_next_key() never returns -ENOENT for the last element, instead reading storage->key from a bogus pointer that aliases internal map fields and copying the result to userspace. Replace it with list_entry_is_head() so the function correctly returns -ENOENT when there are no more entries.
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cgroup_storage_get_next_key使用list_next_entry不会返回NULL，可能导致get_next_key对最后一个元素永远不返回-ENOENT而是从别名内部映射字段的虚假指针读取storage->key并复制到用户空间。
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 de9cbbaadba5adf88a19e46df61f7054000838f6 ~ 0f3d9dd5e1fd52b39e25328307c6a694e994ffe3 -
Linux Linux 4.19 -

II. Public POCs for CVE-2026-45838

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III. Intelligence Information for CVE-2026-45838

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Patches & Fixes for CVE-2026-45838 (7)

Same Patch Batch · Linux · 2026-05-27 · 275 CVEs total

CVE-2026-46039 9.8 CRITICAL rxgk: Fix potential integer overflow in length check
CVE-2026-45898 9.8 CRITICAL RDMA/iwcm: Fix workqueue list corruption by removing work_list
CVE-2026-45972 9.8 CRITICAL smb: client: fix potential UAF and double free in smb2_open_file()
CVE-2026-45988 9.8 CRITICAL rxrpc: Fix re-decryption of RESPONSE packets
CVE-2026-46043 9.1 CRITICAL RDMA/rxe: Validate pad and ICRC before payload_size() in rxe_rcv
CVE-2026-45945 8.8 HIGH iommu/vt-d: Fix race condition during PASID entry replacement
CVE-2026-46056 8.8 HIGH Bluetooth: hci_event: fix potential UAF in SSP passkey handlers
CVE-2025-71311 8.2 HIGH fs/ntfs3: Initialize new folios before use
CVE-2026-46037 8.2 HIGH ipv4: icmp: validate reply type before using icmp_pointers
CVE-2026-45843 8.2 HIGH slip: bound decode() reads against the compressed packet length
CVE-2026-46099 8.1 HIGH net: ipv6: fix NOREF dst use in seg6 and rpl lwtunnels
CVE-2026-46010 8.1 HIGH rxrpc: Fix error handling in rxgk_extract_token()
CVE-2026-46076 7.9 HIGH KVM: nSVM: Raise #UD if unhandled VMMCALL isn't intercepted by L1
CVE-2026-45910 7.8 HIGH RDMA/rxe: Fix race condition in QP timer handlers
CVE-2026-45931 7.8 HIGH accel/amdxdna: Hold mm structure across iommu_sva_unbind_device()
CVE-2026-45956 7.8 HIGH drm/exynos: vidi: use priv->vidi_dev for ctx lookup in vidi_connection_ioctl()
CVE-2026-46036 7.8 HIGH vfio/cdx: Serialize VFIO_DEVICE_SET_IRQS with a per-device mutex
CVE-2026-46100 7.8 HIGH fs: afs: revert mmap_prepare() change
CVE-2026-45894 7.8 HIGH iommu/vt-d: Clear Present bit before tearing down PASID entry
CVE-2026-45933 7.8 HIGH bpf: Preserve id of register in sync_linked_regs()

Showing top 20 of 275 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-45838

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