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LinuxCVE-2024-46740

HistorySep 18, 2024 - 8:15 a.m.

CVE-2024-46740

2024-09-1808:15:03

Linux

web.nvd.nist.gov

linux kernel

binder

uaf

AI Score

6.5

Confidence

High

EPSS

Percentile

11.0%

JSON

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

binder: fix UAF caused by offsets overwrite

Binder objects are processed and copied individually into the target
buffer during transactions. Any raw data in-between these objects is
copied as well. However, this raw data copy lacks an out-of-bounds
check. If the raw data exceeds the data section size then the copy
overwrites the offsets section. This eventually triggers an error that
attempts to unwind the processed objects. However, at this point the
offsets used to index these objects are now corrupted.

Unwinding with corrupted offsets can result in decrements of arbitrary
nodes and lead to their premature release. Other users of such nodes are
left with a dangling pointer triggering a use-after-free. This issue is
made evident by the following KASAN report (trimmed):

==================================================================
BUG: KASAN: slab-use-after-free in _raw_spin_lock+0xe4/0x19c
Write of size 4 at addr ffff47fc91598f04 by task binder-util/743

CPU: 9 UID: 0 PID: 743 Comm: binder-util Not tainted 6.11.0-rc4 #1
Hardware name: linux,dummy-virt (DT)
Call trace:
_raw_spin_lock+0xe4/0x19c
binder_free_buf+0x128/0x434
binder_thread_write+0x8a4/0x3260
binder_ioctl+0x18f0/0x258c
[…]

Allocated by task 743:
__kmalloc_cache_noprof+0x110/0x270
binder_new_node+0x50/0x700
binder_transaction+0x413c/0x6da8
binder_thread_write+0x978/0x3260
binder_ioctl+0x18f0/0x258c
[…]

Freed by task 745:
kfree+0xbc/0x208
binder_thread_read+0x1c5c/0x37d4
binder_ioctl+0x16d8/0x258c
[…]

To avoid this issue, let’s check that the raw data copy is within the
boundaries of the data section.

Affected configurations

Vulners

Node

linuxlinux_kernelRange5.17–5.4.284

linuxlinux_kernelRange5.5.0–5.10.226

linuxlinux_kernelRange5.11.0–5.15.167

linuxlinux_kernelRange5.16.0–6.1.110

linuxlinux_kernelRange6.2.0–6.6.51

linuxlinux_kernelRange6.7.0–6.10.10

linuxlinux_kernelRange6.11.0≥

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": [
      "drivers/android/binder.c"
    ],
    "versions": [
      {
        "version": "c056a6ba35e0",
        "lessThan": "5a32bfd23022",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "23e9d815fad8",
        "lessThan": "3a8154bb4ab4",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "7a9ad4aceb02",
        "lessThan": "eef79854a04f",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "6d98eb95b450",
        "lessThan": "4f79e0b80dc6",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "6d98eb95b450",
        "lessThan": "1f33d9f1d9ac",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "6d98eb95b450",
        "lessThan": "109e845c1184",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "6d98eb95b450",
        "lessThan": "4df153652cc4",
        "status": "affected",
        "versionType": "git"
      }
    ]
  },
  {
    "product": "Linux",
    "vendor": "Linux",
    "defaultStatus": "affected",
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "programFiles": [
      "drivers/android/binder.c"
    ],
    "versions": [
      {
        "version": "5.17",
        "status": "affected"
      },
      {
        "version": "0",
        "lessThan": "5.17",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "5.4.284",
        "lessThanOrEqual": "5.4.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "5.10.226",
        "lessThanOrEqual": "5.10.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "5.15.167",
        "lessThanOrEqual": "5.15.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "6.1.110",
        "lessThanOrEqual": "6.1.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "6.6.51",
        "lessThanOrEqual": "6.6.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "6.10.10",
        "lessThanOrEqual": "6.10.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "6.11",
        "lessThanOrEqual": "*",
        "status": "unaffected",
        "versionType": "original_commit_for_fix"
      }
    ]
  }
]

References

git.kernel.org/stable/c/109e845c1184c9f786d41516348ba3efd9112792

git.kernel.org/stable/c/1f33d9f1d9ac3f0129f8508925000900c2fe5bb0

git.kernel.org/stable/c/3a8154bb4ab4a01390a3abf1e6afac296e037da4

git.kernel.org/stable/c/4df153652cc46545722879415937582028c18af5

git.kernel.org/stable/c/4f79e0b80dc69bd5eaaed70f0df1b558728b4e59

git.kernel.org/stable/c/5a32bfd23022ffa7e152f273fa3fa29befb7d929

git.kernel.org/stable/c/eef79854a04feac5b861f94d7b19cbbe79874117