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CVE-2024-57952— Revert "libfs: fix infinite directory reads for offset dir"

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。攻击者利用该漏洞可以导致现有条目在readdir输出中消失。

CVSS 7.1 · High EPSS 0.22% · P12

Possible ATT&CK Techniques 1 AI

T1074 · Data Staged

Affected Version Matrix 10

VendorProduct Version RangeStatus
Linux Linux 64a7ce76fb901bf9f9c36cf5d681328fc0fd4b5a< 9e9e710f68bac49bd9b587823c077d06363440e0 affected
64a7ce76fb901bf9f9c36cf5d681328fc0fd4b5a< 3f250b82040a72b0059ae00855a74d8570ad2147 affected
64a7ce76fb901bf9f9c36cf5d681328fc0fd4b5a< b662d858131da9a8a14e68661656989b14dbf113 affected
308b4fc2403b335894592ee9dc212a5e58bb309f affected
6.10.7< 6.11 affected
6.11 affected
< 6.11 unaffected
6.12.12≤ 6.12.* unaffected
… +2 more rows
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I. Basic Information for CVE-2024-57952

Vulnerability Information
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Vulnerability Title
Revert "libfs: fix infinite directory reads for offset dir"
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: Revert "libfs: fix infinite directory reads for offset dir" The current directory offset allocator (based on mtree_alloc_cyclic) stores the next offset value to return in octx->next_offset. This mechanism typically returns values that increase monotonically over time. Eventually, though, the newly allocated offset value wraps back to a low number (say, 2) which is smaller than other already- allocated offset values. Yu Kuai <yukuai3@huawei.com> reports that, after commit 64a7ce76fb90 ("libfs: fix infinite directory reads for offset dir"), if a directory's offset allocator wraps, existing entries are no longer visible via readdir/getdents because offset_readdir() stops listing entries once an entry's offset is larger than octx->next_offset. These entries vanish persistently -- they can be looked up, but will never again appear in readdir(3) output. The reason for this is that the commit treats directory offsets as monotonically increasing integer values rather than opaque cookies, and introduces this comparison: if (dentry2offset(dentry) >= last_index) { On 64-bit platforms, the directory offset value upper bound is 2^63 - 1. Directory offsets will monotonically increase for millions of years without wrapping. On 32-bit platforms, however, LONG_MAX is 2^31 - 1. The allocator can wrap after only a few weeks (at worst). Revert commit 64a7ce76fb90 ("libfs: fix infinite directory reads for offset dir") to prepare for a fix that can work properly on 32-bit systems and might apply to recent LTS kernels where shmem employs the simple_offset mechanism.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/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。攻击者利用该漏洞可以导致现有条目在readdir输出中消失。
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 64a7ce76fb901bf9f9c36cf5d681328fc0fd4b5a ~ 9e9e710f68bac49bd9b587823c077d06363440e0 -
Linux Linux 6.11 -

II. Public POCs for CVE-2024-57952

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III. Intelligence Information for CVE-2024-57952

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Patches & Fixes for CVE-2024-57952 (3)

Same Patch Batch · Linux · 2025-02-12 · 7 CVEs total

CVE-2025-21697 7.8 HIGH drm/v3d: Ensure job pointer is set to NULL after job completion
CVE-2025-21699 7.8 HIGH gfs2: Truncate address space when flipping GFS2_DIF_JDATA flag
CVE-2024-57951 hrtimers: Handle CPU state correctly on hotplug
CVE-2025-21694 fs/proc: fix softlockup in __read_vmcore (part 2)
CVE-2025-21695 platform/x86: dell-uart-backlight: fix serdev race
CVE-2025-21696 mm: clear uffd-wp PTE/PMD state on mremap()

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2024-57952

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