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CVE-2023-54033— bpf: fix a memory leak in the LRU and LRU_PERCPU hash maps

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BPF LRU哈希映射在桶锁定失败时未释放分配的元素，可能导致内存泄漏。

AI Predicted 5.5 Difficulty: Moderate EPSS 0.19% · P8

Possible ATT&CK Techniques 1 AI

T1562

Affected Version Matrix 10

VendorProduct Version RangeStatus
Linux Linux 20b6cc34ea74b6a84599c1f8a70f3315b56a1883< 79ea1a12fb9a8275b6e19d4ca625dd872dedcbb9 affected
20b6cc34ea74b6a84599c1f8a70f3315b56a1883< 1a9e80f757bbb1562d82e350afce2bb2f712cc3d affected
20b6cc34ea74b6a84599c1f8a70f3315b56a1883< 965e9cccbe6b9c7b379908cebcb5e3a47f20dd5e affected
20b6cc34ea74b6a84599c1f8a70f3315b56a1883< b34ffb0c6d23583830f9327864b9c1f486003305 affected
5.11 affected
< 5.11 unaffected
5.15.115≤ 5.15.* unaffected
6.1.31≤ 6.1.* unaffected
… +2 more rows
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I. Basic Information for CVE-2023-54033

Vulnerability Information
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Vulnerability Title
bpf: fix a memory leak in the LRU and LRU_PERCPU hash maps
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: bpf: fix a memory leak in the LRU and LRU_PERCPU hash maps The LRU and LRU_PERCPU maps allocate a new element on update before locking the target hash table bucket. Right after that the maps try to lock the bucket. If this fails, then maps return -EBUSY to the caller without releasing the allocated element. This makes the element untracked: it doesn't belong to either of free lists, and it doesn't belong to the hash table, so can't be re-used; this eventually leads to the permanent -ENOMEM on LRU map updates, which is unexpected. Fix this by returning the element to the local free list if bucket locking fails.
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BPF LRU哈希映射在桶锁定失败时未释放分配的元素，可能导致内存泄漏。
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 20b6cc34ea74b6a84599c1f8a70f3315b56a1883 ~ 79ea1a12fb9a8275b6e19d4ca625dd872dedcbb9 -
Linux Linux 5.11 -

II. Public POCs for CVE-2023-54033

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III. Intelligence Information for CVE-2023-54033

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Other References for CVE-2023-54033 (2)

Same Patch Batch · Linux · 2025-12-24 · 322 CVEs total

CVE-2025-68741 9.8 CRITICAL scsi: qla2xxx: Fix improper freeing of purex item
CVE-2023-53867 9.8 CRITICAL ceph: fix potential use-after-free bug when trimming caps
CVE-2025-68726 9.8 CRITICAL crypto: aead - Fix reqsize handling
CVE-2023-54094 9.8 CRITICAL net: prevent skb corruption on frag list segmentation
CVE-2023-54090 9.8 CRITICAL ixgbe: Fix panic during XDP_TX with > 64 CPUs
CVE-2022-50717 9.8 CRITICAL nvmet-tcp: add bounds check on Transfer Tag
CVE-2023-54076 9.8 CRITICAL smb: client: fix missed ses refcounting
CVE-2025-68359 9.8 CRITICAL btrfs: fix double free of qgroup record after failure to add delayed ref head
CVE-2025-68745 9.8 CRITICAL scsi: qla2xxx: Clear cmds after chip reset
CVE-2023-53996 9.3 CRITICAL x86/sev: Make enc_dec_hypercall() accept a size instead of npages
CVE-2023-54060 8.8 HIGH iommufd: Set end correctly when doing batch carry
CVE-2025-68736 8.8 HIGH landlock: Fix handling of disconnected directories
CVE-2023-54092 8.8 HIGH KVM: s390: pv: fix index value of replaced ASCE
CVE-2023-54071 8.8 HIGH wifi: rtw88: use work to update rate to avoid RCU warning
CVE-2023-54043 8.8 HIGH iommufd: Do not add the same hwpt to the ioas->hwpt_list twice
CVE-2023-54040 8.8 HIGH ice: fix wrong fallback logic for FDIR
CVE-2023-54120 8.8 HIGH Bluetooth: Fix race condition in hidp_session_thread
CVE-2022-50732 8.8 HIGH staging: rtl8192u: Fix use after free in ieee80211_rx()
CVE-2023-53986 8.6 HIGH mips: bmips: BCM6358: disable RAC flush for TP1
CVE-2022-50746 8.4 HIGH erofs: validate the extent length for uncompressed pclusters

Showing top 20 of 322 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2023-54033

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