CVE-2024-26606 binder: signal epoll threads of self-work

2024-02-2614:39:15

Linux

www.cve.org

linux kernel

vulnerability

binder

signal

epoll threads

i/o events

epoll_wait

command

binder_write_read

wakeup

6.6 Medium

AI Score

Confidence

High

0.0004 Low

EPSS

Percentile

5.1%

JSON

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

binder: signal epoll threads of self-work

In (e)poll mode, threads often depend on I/O events to determine when
data is ready for consumption. Within binder, a thread may initiate a
command via BINDER_WRITE_READ without a read buffer and then make use
of epoll_wait() or similar to consume any responses afterwards.

It is then crucial that epoll threads are signaled via wakeup when they
queue their own work. Otherwise, they risk waiting indefinitely for an
event leaving their work unhandled. What is worse, subsequent commands
won’t trigger a wakeup either as the thread has pending work.

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": "457b9a6f09f0",
        "lessThan": "dd64bb8329ce",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "457b9a6f09f0",
        "lessThan": "42beab162dce",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "457b9a6f09f0",
        "lessThan": "a423042052ec",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "457b9a6f09f0",
        "lessThan": "82722b453dc2",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "457b9a6f09f0",
        "lessThan": "90e09c016d72",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "457b9a6f09f0",
        "lessThan": "a7ae586f6f60",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "457b9a6f09f0",
        "lessThan": "93b372c39c40",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "457b9a6f09f0",
        "lessThan": "97830f3c3088",
        "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": "2.6.29",
        "status": "affected"
      },
      {
        "version": "0",
        "lessThan": "2.6.29",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "4.19.307",
        "lessThanOrEqual": "4.19.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "5.4.269",
        "lessThanOrEqual": "5.4.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "5.10.210",
        "lessThanOrEqual": "5.10.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "5.15.149",
        "lessThanOrEqual": "5.15.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "6.1.79",
        "lessThanOrEqual": "6.1.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "6.6.18",
        "lessThanOrEqual": "6.6.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "6.7.6",
        "lessThanOrEqual": "6.7.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "6.8",
        "lessThanOrEqual": "*",
        "status": "unaffected",
        "versionType": "original_commit_for_fix"
      }
    ]
  }
]