Description

In the Linux kernel, the following vulnerability has been resolved:

nfsd: map the EBADMSG to nfserr_io to avoid warning

Ext4 will throw -EBADMSG through ext4_readdir when a checksum error
occurs, resulting in the following WARNING.

Fix it by mapping EBADMSG to nfserr_io.

nfsd_buffered_readdir
iterate_dir // -EBADMSG -74
ext4_readdir // .iterate_shared
ext4_dx_readdir
ext4_htree_fill_tree
htree_dirblock_to_tree
ext4_read_dirblock
__ext4_read_dirblock
ext4_dirblock_csum_verify
warn_no_space_for_csum
__warn_no_space_for_csum
return ERR_PTR(-EFSBADCRC) // -EBADMSG -74
nfserrno // WARNING

[ 161.115610] ------------[ cut here ]------------
[ 161.116465] nfsd: non-standard errno: -74
[ 161.117315] WARNING: CPU: 1 PID: 780 at fs/nfsd/nfsproc.c:878 nfserrno+0x9d/0xd0
[ 161.118596] Modules linked in:
[ 161.119243] CPU: 1 PID: 780 Comm: nfsd Not tainted 5.10.0-00014-g79679361fd5d #138
[ 161.120684] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.14.0-0-g155821a1990b-prebuilt.qe
mu.org 04/01/2014
[ 161.123601] RIP: 0010:nfserrno+0x9d/0xd0
[ 161.124676] Code: 0f 87 da 30 dd 00 83 e3 01 b8 00 00 00 05 75 d7 44 89 ee 48 c7 c7 c0 57 24 98 89 44 24 04 c6
05 ce 2b 61 03 01 e8 99 20 d8 00 <0f> 0b 8b 44 24 04 eb b5 4c 89 e6 48 c7 c7 a0 6d a4 99 e8 cc 15 33
[ 161.127797] RSP: 0018:ffffc90000e2f9c0 EFLAGS: 00010286
[ 161.128794] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
[ 1...

Classification

CVE ID: CVE-2024-49875

CVSS Base Severity: MEDIUM

CVSS Base Score: 5.5

CVSS Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N

Affected Products

Vendor: Linux

Product: Linux

Exploit Prediction Scoring System (EPSS)

EPSS Score: 0.01% (probability of being exploited)

EPSS Percentile: 0.91% (scored less or equal to compared to others)

EPSS Date: 2025-06-02 (when was this score calculated)

Stakeholder-Specific Vulnerability Categorization (SSVC)

SSVC Exploitation: none

SSVC Technical Impact: partial

SSVC Automatable: false

References

https://nvd.nist.gov/vuln/detail/CVE-2024-49875
https://git.kernel.org/stable/c/0ea4333c679f333e23956de743ad17387819d3f2
https://git.kernel.org/stable/c/825789ca94602543101045ad3aad19b2b60c6b2a
https://git.kernel.org/stable/c/6fe058502f8864649c3d614b06b2235223798f48
https://git.kernel.org/stable/c/f7d8ee9db94372b8235f5f22bb24381891594c42
https://git.kernel.org/stable/c/c76005adfa93d1a027433331252422078750321f
https://git.kernel.org/stable/c/e9cfecca22a36b927a440abc6307efb9e138fed5
https://git.kernel.org/stable/c/340e61e44c1d2a15c42ec72ade9195ad525fd048

Timeline