Lucene search

LinuxCVE-2024-26901

HistoryApr 17, 2024 - 11:15 a.m.

CVE-2024-26901

2024-04-1711:15:10

CWE-908

Linux

web.nvd.nist.gov

linux kernel

vulnerability resolved

syzbot

information leak

chuck lever

kmalloc

kzalloc

memory access

CVSS3

5.5

Attack Vector

LOCAL

Attack Complexity

LOW

Privileges Required

LOW

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

NONE

Integrity Impact

NONE

Availability Impact

HIGH

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

AI Score

5.8

Confidence

Low

EPSS

Percentile

5.1%

JSON

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

do_sys_name_to_handle(): use kzalloc() to fix kernel-infoleak

syzbot identified a kernel information leak vulnerability in
do_sys_name_to_handle() and issued the following report [1].

[1]
"BUG: KMSAN: kernel-infoleak in instrument_copy_to_user include/linux/instrumented.h:114 [inline]
BUG: KMSAN: kernel-infoleak in _copy_to_user+0xbc/0x100 lib/usercopy.c:40
instrument_copy_to_user include/linux/instrumented.h:114 [inline]
_copy_to_user+0xbc/0x100 lib/usercopy.c:40
copy_to_user include/linux/uaccess.h:191 [inline]
do_sys_name_to_handle fs/fhandle.c:73 [inline]
__do_sys_name_to_handle_at fs/fhandle.c:112 [inline]
__se_sys_name_to_handle_at+0x949/0xb10 fs/fhandle.c:94
__x64_sys_name_to_handle_at+0xe4/0x140 fs/fhandle.c:94
…

Uninit was created at:
slab_post_alloc_hook+0x129/0xa70 mm/slab.h:768
slab_alloc_node mm/slub.c:3478 [inline]
__kmem_cache_alloc_node+0x5c9/0x970 mm/slub.c:3517
__do_kmalloc_node mm/slab_common.c:1006 [inline]
__kmalloc+0x121/0x3c0 mm/slab_common.c:1020
kmalloc include/linux/slab.h:604 [inline]
do_sys_name_to_handle fs/fhandle.c:39 [inline]
__do_sys_name_to_handle_at fs/fhandle.c:112 [inline]
__se_sys_name_to_handle_at+0x441/0xb10 fs/fhandle.c:94
__x64_sys_name_to_handle_at+0xe4/0x140 fs/fhandle.c:94
…

Bytes 18-19 of 20 are uninitialized
Memory access of size 20 starts at ffff888128a46380
Data copied to user address 0000000020000240"

Per Chuck Lever’s suggestion, use kzalloc() instead of kmalloc() to
solve the problem.

Affected configurations

Nvd

Vulners

Node

linuxlinux_kernelRange2.6.39–4.19.311

linuxlinux_kernelRange4.20–5.4.273

linuxlinux_kernelRange5.5–5.10.214

linuxlinux_kernelRange5.11–5.15.153

linuxlinux_kernelRange5.16–6.1.83

linuxlinux_kernelRange6.2–6.6.23

linuxlinux_kernelRange6.7–6.7.11

linuxlinux_kernelRange6.8–6.8.2

VendorProductVersionCPE
linuxlinux_kernel*cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*

Vendor	Product	Version	CPE
linux	linux_kernel	*	cpe:2.3:o:linux:linux_kernel::::::::

CNA Affected

[
  {
    "product": "Linux",
    "vendor": "Linux",
    "defaultStatus": "unaffected",
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "programFiles": [
      "fs/fhandle.c"
    ],
    "versions": [
      {
        "version": "990d6c2d7aee",
        "lessThan": "4bac28f441e3",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "990d6c2d7aee",
        "lessThan": "772a7def9868",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "990d6c2d7aee",
        "lessThan": "cde76b3af247",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "990d6c2d7aee",
        "lessThan": "423b6bdf19bb",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "990d6c2d7aee",
        "lessThan": "e6450d5e46a7",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "990d6c2d7aee",
        "lessThan": "c1362eae861d",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "990d6c2d7aee",
        "lessThan": "cba138f1ef37",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "990d6c2d7aee",
        "lessThan": "bf9ec1b24ab4",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "990d6c2d7aee",
        "lessThan": "3948abaa4e2b",
        "status": "affected",
        "versionType": "git"
      }
    ]
  },
  {
    "product": "Linux",
    "vendor": "Linux",
    "defaultStatus": "affected",
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "programFiles": [
      "fs/fhandle.c"
    ],
    "versions": [
      {
        "version": "2.6.39",
        "status": "affected"
      },
      {
        "version": "0",
        "lessThan": "2.6.39",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "4.19.311",
        "lessThanOrEqual": "4.19.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "5.4.273",
        "lessThanOrEqual": "5.4.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "5.10.214",
        "lessThanOrEqual": "5.10.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "5.15.153",
        "lessThanOrEqual": "5.15.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "6.1.83",
        "lessThanOrEqual": "6.1.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "6.6.23",
        "lessThanOrEqual": "6.6.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "6.7.11",
        "lessThanOrEqual": "6.7.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "6.8.2",
        "lessThanOrEqual": "6.8.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "6.9",
        "lessThanOrEqual": "*",
        "status": "unaffected",
        "versionType": "original_commit_for_fix"
      }
    ]
  }
]