CVE-2024-56740

Published Dec 29, 2024

Last updated 8 months ago

CVSS high 7.8

Overview

Description
In the Linux kernel, the following vulnerability has been resolved: nfs/localio: must clear res.replen in nfs_local_read_done Otherwise memory corruption can occur due to NFSv3 LOCALIO reads leaving garbage in res.replen: - nfs3_read_done() copies that into server->read_hdrsize; from there nfs3_proc_read_setup() copies it to args.replen in new requests. - nfs3_xdr_enc_read3args() passes that to rpc_prepare_reply_pages() which includes it in hdrsize for xdr_init_pages, so that rq_rcv_buf contains a ridiculous len. - This is copied to rq_private_buf and xs_read_stream_request() eventually passes the kvec to sock_recvmsg() which receives incoming data into entirely the wrong place. This is easily reproduced with NFSv3 LOCALIO that is servicing reads when it is made to pivot back to using normal RPC. This switch back to using normal NFSv3 with RPC can occur for a few reasons but this issue was exposed with a test that stops and then restarts the NFSv3 server while LOCALIO is performing heavy read IO.
Source
416baaa9-dc9f-4396-8d5f-8c081fb06d67
NVD status
Modified
Products
linux_kernel

Risk scores

CVSS 3.1

Type
Primary
Base score
7.8
Impact score
5.9
Exploitability score
1.8
Vector string
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Severity
HIGH

Weaknesses

nvd@nist.gov
CWE-787
134c704f-9b21-4f2e-91b3-4a467353bcc0
CWE-787

Social media

Hype score
Not currently trending

  1. CVE-2024-56740 Memory Corruption Vulnerability Resolved in Linux Kernel ... https://t.co/q8KRH4FAw6 Don't wait vulnerability scanning results: https://t.co/oh1APvMMnd

    @VulmonFeeds

    29 Dec 2024

    23 Impressions

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  2. CVE-2024-56740 In the Linux kernel, the following vulnerability has been resolved: nfs/localio: must clear res.replen in nfs_local_read_done Otherwise memory corruption can occur … https://t.co/AxB7aw8D3G

    @CVEnew

    29 Dec 2024

    456 Impressions

    1 Retweet

    1 Like

    1 Bookmark

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Configurations

Related CVEs

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References

Sources include official advisories and independent security research.