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CVE-2024-49855— nbd: fix race between timeout and normal completion

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，该漏洞源于在nbd驱动中的竞态条件，可能导致请求超时和正常完成之间发生竞态，触发释放后重用错误。

CVSS 9.8 · Critical EPSS 0.46% · P39

Possible ATT&CK Techniques 1 AI

T1047 · Windows Management Instrumentation

Affected Version Matrix 16

VendorProduct Version RangeStatus
Linux Linux 2895f1831e911ca87d4efdf43e35eb72a0c7e66e< 9c25faf72d780a9c71081710cd48759d61ff6e9b affected
2895f1831e911ca87d4efdf43e35eb72a0c7e66e< 6e73b946a379a1dfbb62626af93843bdfb53753d affected
2895f1831e911ca87d4efdf43e35eb72a0c7e66e< 5236ada8ebbd9e7461f17477357582f5be4f46f7 affected
2895f1831e911ca87d4efdf43e35eb72a0c7e66e< 9a74c3e6c0d686c26ba2aab66d15ddb89dc139cc affected
2895f1831e911ca87d4efdf43e35eb72a0c7e66e< c9ea57c91f03bcad415e1a20113bdb2077bcf990 affected
cdf62c535a9bfd5ff0eef4b91669da39d8abc0c3 affected
5171ef20bae852ff38f4cfdb368bcdcc744776d0 affected
5.17.15< 5.18 affected
… +8 more rows
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I. Basic Information for CVE-2024-49855

Vulnerability Information
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Vulnerability Title
nbd: fix race between timeout and normal completion
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: nbd: fix race between timeout and normal completion If request timetout is handled by nbd_requeue_cmd(), normal completion has to be stopped for avoiding to complete this requeued request, other use-after-free can be triggered. Fix the race by clearing NBD_CMD_INFLIGHT in nbd_requeue_cmd(), meantime make sure that cmd->lock is grabbed for clearing the flag and the requeue.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/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，该漏洞源于在nbd驱动中的竞态条件，可能导致请求超时和正常完成之间发生竞态，触发释放后重用错误。
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 2895f1831e911ca87d4efdf43e35eb72a0c7e66e ~ 9c25faf72d780a9c71081710cd48759d61ff6e9b -
Linux Linux 5.19 -

II. Public POCs for CVE-2024-49855

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III. Intelligence Information for CVE-2024-49855

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Patches & Fixes for CVE-2024-49855 (3)

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-2022-49003 9.8 CRITICAL nvme: fix SRCU protection of nvme_ns_head list
CVE-2024-47695 9.8 CRITICAL RDMA/rtrs-clt: Reset cid to con_num - 1 to stay in bounds
CVE-2024-50043 9.8 CRITICAL nfsd: fix possible badness in FREE_STATEID
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-2024-49950 8.8 HIGH Bluetooth: L2CAP: Fix uaf in l2cap_connect
CVE-2022-49015 8.8 HIGH net: hsr: Fix potential use-after-free
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-2024-50029 8.8 HIGH Bluetooth: hci_conn: Fix UAF in hci_enhanced_setup_sync
CVE-2024-49936 8.8 HIGH net/xen-netback: prevent UAF in xenvif_flush_hash()
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-2022-48964 8.8 HIGH ravb: Fix potential use-after-free in ravb_rx_gbeth()
CVE-2022-48967 8.8 HIGH NFC: nci: Bounds check struct nfc_target arrays

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-2024-49855

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