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416baaa9-dc9f-4396-8d5f-8c081fb06d67CVE-2024-36925

HistoryMay 30, 2024 - 4:15 p.m.

CVE-2024-36925

2024-05-3016:15:15

CWE-476

416baaa9-dc9f-4396-8d5f-8c081fb06d67

web.nvd.nist.gov

linux kernel

vulnerability

resolved

dma pools

crash

null pointer

dynamic swiotlb

5.5 Medium

CVSS3

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

6.5 Medium

AI Score

Confidence

Low

0.0004 Low

EPSS

Percentile

5.1%

JSON

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

swiotlb: initialise restricted pool list_head when SWIOTLB_DYNAMIC=y

Using restricted DMA pools (CONFIG_DMA_RESTRICTED_POOL=y) in conjunction
with dynamic SWIOTLB (CONFIG_SWIOTLB_DYNAMIC=y) leads to the following
crash when initialising the restricted pools at boot-time:

| Unable to handle kernel NULL pointer dereference at virtual address 0000000000000008
| Internal error: Oops: 0000000096000005 [#1] PREEMPT SMP
| pc : rmem_swiotlb_device_init+0xfc/0x1ec
| lr : rmem_swiotlb_device_init+0xf0/0x1ec
| Call trace:
| rmem_swiotlb_device_init+0xfc/0x1ec
| of_reserved_mem_device_init_by_idx+0x18c/0x238
| of_dma_configure_id+0x31c/0x33c
| platform_dma_configure+0x34/0x80

faddr2line reveals that the crash is in the list validation code:

include/linux/list.h:83
include/linux/rculist.h:79
include/linux/rculist.h:106
kernel/dma/swiotlb.c:306
kernel/dma/swiotlb.c:1695

because add_mem_pool() is trying to list_add_rcu() to a NULL
‘mem->pools’.

Fix the crash by initialising the ‘mem->pools’ list_head in
rmem_swiotlb_device_init() before calling add_mem_pool().

Affected configurations

Vulners

NVD

Node

linuxlinux_kernelRange6.6–6.6.31

linuxlinux_kernelRange6.7.0–6.8.10

linuxlinux_kernelRange6.9.0≥

CPENameOperatorVersion
linux:linux_kernellinux linux kernellt6.6.31
linux:linux_kernellinux linux kernellt6.8.10

CPE	Name	Operator	Version
linux:linux_kernel	linux linux kernel	lt	6.6.31
linux:linux_kernel	linux linux kernel	lt	6.8.10

CNA Affected

[
  {
    "product": "Linux",
    "vendor": "Linux",
    "defaultStatus": "unaffected",
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "programFiles": [
      "kernel/dma/swiotlb.c"
    ],
    "versions": [
      {
        "version": "1aaa736815eb",
        "lessThan": "f2a6b3ed20f2",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "1aaa736815eb",
        "lessThan": "f62e0fefcdfe",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "1aaa736815eb",
        "lessThan": "75961ffb5cb3",
        "status": "affected",
        "versionType": "git"
      }
    ]
  },
  {
    "product": "Linux",
    "vendor": "Linux",
    "defaultStatus": "affected",
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "programFiles": [
      "kernel/dma/swiotlb.c"
    ],
    "versions": [
      {
        "version": "6.6",
        "status": "affected"
      },
      {
        "version": "0",
        "lessThan": "6.6",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "6.6.31",
        "lessThanOrEqual": "6.6.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "6.8.10",
        "lessThanOrEqual": "6.8.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "6.9",
        "lessThanOrEqual": "*",
        "status": "unaffected",
        "versionType": "original_commit_for_fix"
      }
    ]
  }
]

References

git.kernel.org/stable/c/75961ffb5cb3e5196f19cae7683f35cc88b50800

git.kernel.org/stable/c/f2a6b3ed20f2dea4cb645abc6a73c4595662adca

git.kernel.org/stable/c/f62e0fefcdfe2c05ccb1aa80521a69524eea9c84

5.5 Medium

CVSS3

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

6.5 Medium

AI Score

Confidence

Low

0.0004 Low

EPSS

Percentile

5.1%

JSON

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