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CVE-2024-42256— cifs: Fix server re-repick on subrequest retry

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，该漏洞源于存在计算错误漏洞。

CVSS 7.5 · High EPSS 0.69% · P52

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service

Affected Version Matrix 6

VendorProduct Version RangeStatus
Linux Linux 3ee1a1fc39819906f04d6c62c180e760cd3a689d< b1d0a566769b6fb3795b5289fc1daf9e0638d97a affected
3ee1a1fc39819906f04d6c62c180e760cd3a689d< de40579b903883274fe203865f29d66b168b7236 affected
6.10 affected
< 6.10 unaffected
6.10.1≤ 6.10.* unaffected
6.11≤ * unaffected
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I. Basic Information for CVE-2024-42256

Vulnerability Information
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Vulnerability Title
cifs: Fix server re-repick on subrequest retry
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: cifs: Fix server re-repick on subrequest retry When a subrequest is marked for needing retry, netfs will call cifs_prepare_write() which will make cifs repick the server for the op before renegotiating credits; it then calls cifs_issue_write() which invokes smb2_async_writev() - which re-repicks the server. If a different server is then selected, this causes the increment of server->in_flight to happen against one record and the decrement to happen against another, leading to misaccounting. Fix this by just removing the repick code in smb2_async_writev(). As this is only called from netfslib-driven code, cifs_prepare_write() should always have been called first, and so server should never be NULL and the preparatory step is repeated in the event that we do a retry. The problem manifests as a warning looking something like: WARNING: CPU: 4 PID: 72896 at fs/smb/client/smb2ops.c:97 smb2_add_credits+0x3f0/0x9e0 [cifs] ... RIP: 0010:smb2_add_credits+0x3f0/0x9e0 [cifs] ... smb2_writev_callback+0x334/0x560 [cifs] cifs_demultiplex_thread+0x77a/0x11b0 [cifs] kthread+0x187/0x1d0 ret_from_fork+0x34/0x60 ret_from_fork_asm+0x1a/0x30 Which may be triggered by a number of different xfstests running against an Azure server in multichannel mode. generic/249 seems the most repeatable, but generic/215, generic/249 and generic/308 may also show it.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/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，该漏洞源于存在计算错误漏洞。
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 3ee1a1fc39819906f04d6c62c180e760cd3a689d ~ b1d0a566769b6fb3795b5289fc1daf9e0638d97a -
Linux Linux 6.10 -

II. Public POCs for CVE-2024-42256

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III. Intelligence Information for CVE-2024-42256

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Patches & Fixes for CVE-2024-42256 (1)

Same Patch Batch · Linux · 2024-08-08 · 7 CVEs total

CVE-2024-42253 7.8 HIGH gpio: pca953x: fix pca953x_irq_bus_sync_unlock race
CVE-2024-42257 ext4: use memtostr_pad() for s_volume_name
CVE-2024-42255 tpm: Use auth only after NULL check in tpm_buf_check_hmac_response()
CVE-2024-42254 io_uring: fix error pbuf checking
CVE-2024-42252 closures: Change BUG_ON() to WARN_ON()
CVE-2024-42251 mm: page_ref: remove folio_try_get_rcu()

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2024-42256

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