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CVE-2025-38049— x86/resctrl: Fix allocation of cleanest CLOSID on platforms with no monitors

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，该漏洞源于未正确处理无监控器平台的CLOSID分配，可能导致空指针取消引用。

AI Predicted 4.7 Difficulty: Easy EPSS 0.26% · P17

Affected Version Matrix 10

VendorProduct Version RangeStatus
Linux Linux 6eac36bb9eb0349c983313c71692c19d50b56878< a8a1bcc27d4607227088d80483164289b5348293 affected
6eac36bb9eb0349c983313c71692c19d50b56878< ed5addb55e403ad6598102bcf546e068ae01fef6 affected
6eac36bb9eb0349c983313c71692c19d50b56878< 93a418fc61da13d1ee4047d4d1327990f7a2816a affected
6eac36bb9eb0349c983313c71692c19d50b56878< a121798ae669351ec0697c94f71c3a692b2a755b affected
6.9 affected
< 6.9 unaffected
6.12.23≤ 6.12.* unaffected
6.13.11≤ 6.13.* unaffected
… +2 more rows
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I. Basic Information for CVE-2025-38049

Vulnerability Information
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Vulnerability Title
x86/resctrl: Fix allocation of cleanest CLOSID on platforms with no monitors
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: x86/resctrl: Fix allocation of cleanest CLOSID on platforms with no monitors Commit 6eac36bb9eb0 ("x86/resctrl: Allocate the cleanest CLOSID by searching closid_num_dirty_rmid") added logic that causes resctrl to search for the CLOSID with the fewest dirty cache lines when creating a new control group, if requested by the arch code. This depends on the values read from the llc_occupancy counters. The logic is applicable to architectures where the CLOSID effectively forms part of the monitoring identifier and so do not allow complete freedom to choose an unused monitoring identifier for a given CLOSID. This support missed that some platforms may not have these counters. This causes a NULL pointer dereference when creating a new control group as the array was not allocated by dom_data_init(). As this feature isn't necessary on platforms that don't have cache occupancy monitors, add this to the check that occurs when a new control group is allocated.
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，该漏洞源于未正确处理无监控器平台的CLOSID分配，可能导致空指针取消引用。
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 6eac36bb9eb0349c983313c71692c19d50b56878 ~ a8a1bcc27d4607227088d80483164289b5348293 -
Linux Linux 6.9 -

II. Public POCs for CVE-2025-38049

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III. Intelligence Information for CVE-2025-38049

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Other References for CVE-2025-38049 (4)

Same Patch Batch · Linux · 2025-04-18 · 23 CVEs total

CVE-2025-39930 8.4 HIGH ASoC: simple-card-utils: Don't use __free(device_node) at graph_util_parse_dai()
CVE-2025-40364 7.8 HIGH io_uring: fix io_req_prep_async with provided buffers
CVE-2025-37785 7.8 HIGH ext4: fix OOB read when checking dotdot dir
CVE-2025-37893 7.8 HIGH LoongArch: BPF: Fix off-by-one error in build_prologue()
CVE-2025-37838 7.8 HIGH HSI: ssi_protocol: Fix use after free vulnerability in ssi_protocol Driver Due to Race Con
CVE-2025-39688 7.5 HIGH nfsd: allow SC_STATUS_FREEABLE when searching via nfs4_lookup_stateid()
CVE-2025-39735 7.1 HIGH jfs: fix slab-out-of-bounds read in ea_get()
CVE-2025-38575 ksmbd: use aead_request_free to match aead_request_alloc
CVE-2025-37860 sfc: fix NULL dereferences in ef100_process_design_param()
CVE-2025-37925 jfs: reject on-disk inodes of an unsupported type
CVE-2025-40325 md/raid10: wait barrier before returning discard request with REQ_NOWAIT
CVE-2025-38104 drm/amdgpu: Replace Mutex with Spinlock for RLCG register access to avoid Priority Inversi
CVE-2025-38152 remoteproc: core: Clear table_sz when rproc_shutdown
CVE-2025-38240 drm/mediatek: dp: drm_err => dev_err in HPD path to avoid NULL ptr
CVE-2025-38479 dmaengine: fsl-edma: free irq correctly in remove path
CVE-2025-40014 objtool, spi: amd: Fix out-of-bounds stack access in amd_set_spi_freq()
CVE-2025-38637 net_sched: skbprio: Remove overly strict queue assertions
CVE-2025-39728 clk: samsung: Fix UBSAN panic in samsung_clk_init()
CVE-2025-39755 staging: gpib: Fix cb7210 pcmcia Oops
CVE-2025-39778 objtool, nvmet: Fix out-of-bounds stack access in nvmet_ctrl_state_show()

Showing top 20 of 23 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2025-38049

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