CVE-2023-52847 media: bttv: fix use after free error due to btv->timeout timer

2024-05-2115:31:44

Linux

www.cve.org

cve-2023-52847

media

bttv

use after free error

timeout timer

linux kernel

race condition

static analysis

false positive

del_timer_sync

remove function

cpu0

cpu1

6.4 Medium

AI Score

Confidence

Low

0.0004 Low

EPSS

Percentile

13.0%

JSON

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

media: bttv: fix use after free error due to btv->timeout timer

There may be some a race condition between timer function
bttv_irq_timeout and bttv_remove. The timer is setup in
probe and there is no timer_delete operation in remove
function. When it hit kfree btv, the function might still be
invoked, which will cause use after free bug.

This bug is found by static analysis, it may be false positive.

Fix it by adding del_timer_sync invoking to the remove function.

cpu0 cpu1
bttv_probe
->timer_setup
->bttv_set_dma
->mod_timer;
bttv_remove
->kfree(btv);
->bttv_irq_timeout
->USE btv

CNA Affected

[
  {
    "product": "Linux",
    "vendor": "Linux",
    "defaultStatus": "unaffected",
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "programFiles": [
      "drivers/media/pci/bt8xx/bttv-driver.c"
    ],
    "versions": [
      {
        "version": "162e6376ac58",
        "lessThan": "bbc3b8dd2cb7",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "162e6376ac58",
        "lessThan": "b35fdade92c5",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "162e6376ac58",
        "lessThan": "2f3d9198cdae",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "162e6376ac58",
        "lessThan": "51c94256a83f",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "162e6376ac58",
        "lessThan": "20568d06f606",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "162e6376ac58",
        "lessThan": "1871014d6ef4",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "162e6376ac58",
        "lessThan": "847599fffa52",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "162e6376ac58",
        "lessThan": "bd5b50b329e8",
        "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/media/pci/bt8xx/bttv-driver.c"
    ],
    "versions": [
      {
        "version": "4.15",
        "status": "affected"
      },
      {
        "version": "0",
        "lessThan": "4.15",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "4.19.299",
        "lessThanOrEqual": "4.19.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "5.4.261",
        "lessThanOrEqual": "5.4.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "5.10.201",
        "lessThanOrEqual": "5.10.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "5.15.139",
        "lessThanOrEqual": "5.15.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "6.1.63",
        "lessThanOrEqual": "6.1.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "6.5.12",
        "lessThanOrEqual": "6.5.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "6.6.2",
        "lessThanOrEqual": "6.6.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "6.7",
        "lessThanOrEqual": "*",
        "status": "unaffected",
        "versionType": "original_commit_for_fix"
      }
    ]
  }
]