CVE-2024-38583 nilfs2: fix use-after-free of timer for log writer thread

2024-06-1913:37:39

Linux

www.cve.org

linux kernel

nilfs2

use-after-free

timer

log writer

thread

patch

series

bug fix

deadlock

unmount

freeze

event synchronization

vulnerability

cve

0.0004 Low

EPSS

Percentile

13.1%

JSON

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

nilfs2: fix use-after-free of timer for log writer thread

Patch series “nilfs2: fix log writer related issues”.

This bug fix series covers three nilfs2 log writer-related issues,
including a timer use-after-free issue and potential deadlock issue on
unmount, and a potential freeze issue in event synchronization found
during their analysis. Details are described in each commit log.

This patch (of 3):

A use-after-free issue has been reported regarding the timer sc_timer on
the nilfs_sc_info structure.

The problem is that even though it is used to wake up a sleeping log
writer thread, sc_timer is not shut down until the nilfs_sc_info structure
is about to be freed, and is used regardless of the thread’s lifetime.

Fix this issue by limiting the use of sc_timer only while the log writer
thread is alive.

CNA Affected

[
  {
    "product": "Linux",
    "vendor": "Linux",
    "defaultStatus": "unaffected",
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "programFiles": [
      "fs/nilfs2/segment.c"
    ],
    "versions": [
      {
        "version": "fdce895ea5dd",
        "lessThan": "822ae5a8eac3",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "fdce895ea5dd",
        "lessThan": "82933c84f188",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "fdce895ea5dd",
        "lessThan": "67fa90d4a2cc",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "fdce895ea5dd",
        "lessThan": "e65ccf3a4de4",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "fdce895ea5dd",
        "lessThan": "86a30d6302de",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "fdce895ea5dd",
        "lessThan": "f9186bba4ea2",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "fdce895ea5dd",
        "lessThan": "2f12b2c03c5d",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "fdce895ea5dd",
        "lessThan": "68e738be5c51",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "fdce895ea5dd",
        "lessThan": "f5d4e04634c9",
        "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/nilfs2/segment.c"
    ],
    "versions": [
      {
        "version": "2.6.35",
        "status": "affected"
      },
      {
        "version": "0",
        "lessThan": "2.6.35",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "4.19.316",
        "lessThanOrEqual": "4.19.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "5.4.278",
        "lessThanOrEqual": "5.4.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "5.10.219",
        "lessThanOrEqual": "5.10.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "5.15.161",
        "lessThanOrEqual": "5.15.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "6.1.94",
        "lessThanOrEqual": "6.1.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "6.6.33",
        "lessThanOrEqual": "6.6.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "6.8.12",
        "lessThanOrEqual": "6.8.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "6.9.3",
        "lessThanOrEqual": "6.9.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "6.10-rc1",
        "lessThanOrEqual": "*",
        "status": "unaffected",
        "versionType": "original_commit_for_fix"
      }
    ]
  }
]