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CVE-2023-54020— dmaengine: sf-pdma: pdma_desc memory leak fix

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sf-pdma驱动未正确释放描述符导致内存泄漏，可能造成内存耗尽。

AI Predicted 5.3 Difficulty: Moderate EPSS 0.19% · P9

Possible ATT&CK Techniques 1 AI

T1496 · Resource Hijacking

Affected Version Matrix 17

VendorProduct Version RangeStatus
Linux Linux 5ab2782c944e324008ef5d658f2494a9f0e3c5ac< ad222c9af25e3f074c180e389b3477dce42afc4f affected
b2cc5c465c2cb8ab697c3fd6583c614e3f6cfbcc< 03fece43fa109beba7cc9948c02f5e2d1205d607 affected
b2cc5c465c2cb8ab697c3fd6583c614e3f6cfbcc< 8bd5040bd43f2b5ba3c898b09a3197a0c7ace126 affected
b2cc5c465c2cb8ab697c3fd6583c614e3f6cfbcc< b02e07015a5ac7bbc029da931ae17914b8ae0339 affected
b9b4992f897be9b0b9e3a3b956cab6b75ccc3f11 affected
4c7350b1dd8a192af844de32fc99b9e34c876fda affected
a93b3f1e11971a91b6441b6d47488f4492cc113f affected
5.15.61< 5.15.99 affected
… +9 more rows
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I. Basic Information for CVE-2023-54020

Vulnerability Information
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Vulnerability Title
dmaengine: sf-pdma: pdma_desc memory leak fix
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: dmaengine: sf-pdma: pdma_desc memory leak fix Commit b2cc5c465c2c ("dmaengine: sf-pdma: Add multithread support for a DMA channel") changed sf_pdma_prep_dma_memcpy() to unconditionally allocate a new sf_pdma_desc each time it is called. The driver previously recycled descs, by checking the in_use flag, only allocating additional descs if the existing one was in use. This logic was removed in commit b2cc5c465c2c ("dmaengine: sf-pdma: Add multithread support for a DMA channel"), but sf_pdma_free_desc() was not changed to handle the new behaviour. As a result, each time sf_pdma_prep_dma_memcpy() is called, the previous descriptor is leaked, over time leading to memory starvation: unreferenced object 0xffffffe008447300 (size 192): comm "irq/39-mchp_dsc", pid 343, jiffies 4294906910 (age 981.200s) hex dump (first 32 bytes): 00 00 00 ff 00 00 00 00 b8 c1 00 00 00 00 00 00 ................ 00 00 70 08 10 00 00 00 00 00 00 c0 00 00 00 00 ..p............. backtrace: [<00000000064a04f4>] kmemleak_alloc+0x1e/0x28 [<00000000018927a7>] kmem_cache_alloc+0x11e/0x178 [<000000002aea8d16>] sf_pdma_prep_dma_memcpy+0x40/0x112 Add the missing kfree() to sf_pdma_free_desc(), and remove the redundant in_use flag.
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sf-pdma驱动未正确释放描述符导致内存泄漏，可能造成内存耗尽。
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 5ab2782c944e324008ef5d658f2494a9f0e3c5ac ~ ad222c9af25e3f074c180e389b3477dce42afc4f -
Linux Linux 6.0 -

II. Public POCs for CVE-2023-54020

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III. Intelligence Information for CVE-2023-54020

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Other References for CVE-2023-54020 (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-2023-54020

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