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CVE-2024-49854— block, bfq: fix uaf for accessing waker_bfqq after splitting

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层的bfq模块在分裂bfqq后访问waker_bfqq时可能发生释放后重用问题。

CVSS 7.8 · High EPSS 0.21% · P11

Possible ATT&CK Techniques 1 AI

T1055 · Process Injection

Affected Version Matrix 13

VendorProduct Version RangeStatus
Linux Linux e0c20d88b7dce85d2703bb6ba77bf359959675cd< 63a07379fdb6c72450cb05294461c6016b8b7726 affected
de6c5e3a456019d2182e345730e59721714fa0b5< de0456460f2abf921e356ed2bd8da87a376680bd affected
19f3bec2ac4be329b9bd12b18a989b867618d2d8< 0780451f03bf518bc032a7c584de8f92e2d39d7f affected
13b3d0e8cb121f99b11918a0d4bcc1ce4647d352< 0b8bda0ff17156cd3f60944527c9d8c9f99f1583 affected
4780f50ea50cfe8e89fc3747bf3dd155488433bb< cae58d19121a70329cf971359e2518c93fec04fe affected
42c306ed723321af4003b2a41bb73728cab54f85< 1ba0403ac6447f2d63914fb760c44a3b19c44eaf affected
9e813033594b141f61ff0ef0cfaaef292564b041 affected
3a5f45a4ad4e1fd36b0a998eef03d76a4f02a2a8 affected
… +5 more rows
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I. Basic Information for CVE-2024-49854

Vulnerability Information
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Vulnerability Title
block, bfq: fix uaf for accessing waker_bfqq after splitting
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: block, bfq: fix uaf for accessing waker_bfqq after splitting After commit 42c306ed7233 ("block, bfq: don't break merge chain in bfq_split_bfqq()"), if the current procress is the last holder of bfqq, the bfqq can be freed after bfq_split_bfqq(). Hence recored the bfqq and then access bfqq->waker_bfqq may trigger UAF. What's more, the waker_bfqq may in the merge chain of bfqq, hence just recored waker_bfqq is still not safe. Fix the problem by adding a helper bfq_waker_bfqq() to check if bfqq->waker_bfqq is in the merge chain, and current procress is the only holder.
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层的bfq模块在分裂bfqq后访问waker_bfqq时可能发生释放后重用问题。
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 e0c20d88b7dce85d2703bb6ba77bf359959675cd ~ 63a07379fdb6c72450cb05294461c6016b8b7726 -
Linux Linux - -

II. Public POCs for CVE-2024-49854

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III. Intelligence Information for CVE-2024-49854

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Patches & Fixes for CVE-2024-49854 (4)

Same Patch Batch · Linux · 2024-10-21 · 372 CVEs total

CVE-2022-48985 9.8 CRITICAL net: mana: Fix race on per-CQ variable napi work_done
CVE-2024-50033 9.8 CRITICAL slip: make slhc_remember() more robust against malicious packets
CVE-2024-49855 9.8 CRITICAL nbd: fix race between timeout and normal completion
CVE-2022-49003 9.8 CRITICAL nvme: fix SRCU protection of nvme_ns_head list
CVE-2024-50043 9.8 CRITICAL nfsd: fix possible badness in FREE_STATEID
CVE-2024-47695 9.8 CRITICAL RDMA/rtrs-clt: Reset cid to con_num - 1 to stay in bounds
CVE-2024-50047 9.8 CRITICAL smb: client: fix UAF in async decryption
CVE-2024-50046 9.8 CRITICAL NFSv4: Prevent NULL-pointer dereference in nfs42_complete_copies()
CVE-2024-49996 9.4 CRITICAL cifs: Fix buffer overflow when parsing NFS reparse points
CVE-2024-47678 9.4 CRITICAL icmp: change the order of rate limits
CVE-2022-49017 8.8 HIGH tipc: re-fetch skb cb after tipc_msg_validate
CVE-2022-49015 8.8 HIGH net: hsr: Fix potential use-after-free
CVE-2024-49950 8.8 HIGH Bluetooth: L2CAP: Fix uaf in l2cap_connect
CVE-2024-49939 8.8 HIGH wifi: rtw89: avoid to add interface to list twice when SER
CVE-2024-50041 8.8 HIGH i40e: Fix macvlan leak by synchronizing access to mac_filter_hash
CVE-2024-49936 8.8 HIGH net/xen-netback: prevent UAF in xenvif_flush_hash()
CVE-2024-50029 8.8 HIGH Bluetooth: hci_conn: Fix UAF in hci_enhanced_setup_sync
CVE-2024-49930 8.8 HIGH wifi: ath11k: fix array out-of-bound access in SoC stats
CVE-2024-49988 8.8 HIGH ksmbd: add refcnt to ksmbd_conn struct
CVE-2024-49982 8.8 HIGH aoe: fix the potential use-after-free problem in more places

Showing top 20 of 372 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2024-49854

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