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CVE-2023-52983— block, bfq: fix uaf for bfqq in bic_set_bfqq()

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block bfq组件在bic_set_bfqq函数中可能访问已释放的bfqq。

CVSS 7.8 · High EPSS 0.28% · P20

Affected Version Matrix 8

VendorProduct Version RangeStatus
Linux Linux 5533742c7cb1bc9b1f0bf401cc397d44a3a9e07a< 7f77f3dab5066a7c9da73d72d1eee895ff84a8d5 affected
094f3d9314d67691cb21ba091c1b528f6e3c4893< 511c922c5bf6c8a166bea826e702336bc2424140 affected
761564d93c8265f65543acf0a576b32d66bfa26a< cb1876fc33af26d00efdd473311f1b664c77c44e affected
64dc8c732f5c2b406cc752e6aaa1bd5471159cab< b600de2d7d3a16f9007fad1bdae82a3951a26af2 affected
b22fd72bfebda3956efc4431b60ddfc0a51e03e0 affected
6.0.16< 6.1 affected
5.15.86< 5.15.93 affected
6.1.2< 6.1.11 affected
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I. Basic Information for CVE-2023-52983

Vulnerability Information
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Vulnerability Title
block, bfq: fix uaf for bfqq in bic_set_bfqq()
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: block, bfq: fix uaf for bfqq in bic_set_bfqq() After commit 64dc8c732f5c ("block, bfq: fix possible uaf for 'bfqq->bic'"), bic->bfqq will be accessed in bic_set_bfqq(), however, in some context bic->bfqq will be freed, and bic_set_bfqq() is called with the freed bic->bfqq. Fix the problem by always freeing bfqq after bic_set_bfqq().
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block bfq组件在bic_set_bfqq函数中可能访问已释放的bfqq。
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 5533742c7cb1bc9b1f0bf401cc397d44a3a9e07a ~ 7f77f3dab5066a7c9da73d72d1eee895ff84a8d5 -
Linux Linux 5.15.86 ~ 5.15.93 -

II. Public POCs for CVE-2023-52983

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III. Intelligence Information for CVE-2023-52983

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Patches & Fixes for CVE-2023-52983 (2)

Same Patch Batch · Linux · 2025-03-27 · 124 CVEs total

CVE-2023-53006 9.8 CRITICAL cifs: Fix oops due to uncleared server->smbd_conn in reconnect
CVE-2025-21876 8.8 HIGH iommu/vt-d: Fix suspicious RCU usage
CVE-2025-21890 8.2 HIGH idpf: fix checksums set in idpf_rx_rsc()
CVE-2023-52981 7.8 HIGH drm/i915: Fix request ref counting during error capture & debugfs dump
CVE-2025-21889 7.8 HIGH perf/core: Add RCU read lock protection to perf_iterate_ctx()
CVE-2023-52930 7.8 HIGH drm/i915: Fix potential bit_17 double-free
CVE-2023-52931 7.8 HIGH drm/i915: Avoid potential vm use-after-free
CVE-2023-52934 7.8 HIGH mm/MADV_COLLAPSE: catch !none !huge !bad pmd lookups
CVE-2023-52935 7.8 HIGH mm/khugepaged: fix ->anon_vma race
CVE-2025-21867 7.8 HIGH bpf, test_run: Fix use-after-free issue in eth_skb_pkt_type()
CVE-2022-49760 7.8 HIGH mm/hugetlb: fix PTE marker handling in hugetlb_change_protection()
CVE-2023-52973 7.8 HIGH vc_screen: move load of struct vc_data pointer in vcs_read() to avoid UAF
CVE-2023-52974 7.8 HIGH scsi: iscsi_tcp: Fix UAF during login when accessing the shost ipaddress
CVE-2023-53009 7.8 HIGH drm/amdkfd: Add sync after creating vram bo
CVE-2023-53033 7.8 HIGH netfilter: nft_payload: incorrect arithmetics when fetching VLAN header bits
CVE-2023-53028 7.8 HIGH Revert "wifi: mac80211: fix memory leak in ieee80211_if_add()"
CVE-2023-53026 7.8 HIGH RDMA/core: Fix ib block iterator counter overflow
CVE-2023-53023 7.8 HIGH net: nfc: Fix use-after-free in local_cleanup()
CVE-2023-53021 7.8 HIGH net/sched: sch_taprio: fix possible use-after-free
CVE-2023-52988 7.8 HIGH ALSA: hda/via: Avoid potential array out-of-bound in add_secret_dac_path()

Showing top 20 of 124 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2023-52983

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