CVE-2021-47294

2024-05-2115:15:17

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

web.nvd.nist.gov

cve-2021-47294

netrom module

sock timer api

6.7 Medium

AI Score

Confidence

Low

0.0004 Low

EPSS

Percentile

13.2%

JSON

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

netrom: Decrease sock refcount when sock timers expire

Commit 63346650c1a9 (“netrom: switch to sock timer API”) switched to use
sock timer API. It replaces mod_timer() by sk_reset_timer(), and
del_timer() by sk_stop_timer().

Function sk_reset_timer() will increase the refcount of sock if it is
called on an inactive timer, hence, in case the timer expires, we need to
decrease the refcount ourselves in the handler, otherwise, the sock
refcount will be unbalanced and the sock will never be freed.

Affected configurations

Vulners

Node

linuxlinux_kernelRange5.0–4.4.277

linuxlinux_kernelRange4.5.0–4.9.277

linuxlinux_kernelRange4.10.0–4.14.241

linuxlinux_kernelRange4.15.0–4.19.199

linuxlinux_kernelRange4.20.0–5.4.136

linuxlinux_kernelRange5.5.0–5.10.54

linuxlinux_kernelRange5.11.0–5.13.6

linuxlinux_kernelRange5.14.0≥

CNA Affected

[
  {
    "product": "Linux",
    "vendor": "Linux",
    "defaultStatus": "unaffected",
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "programFiles": [
      "net/netrom/nr_timer.c"
    ],
    "versions": [
      {
        "version": "ce29e8a259de",
        "lessThan": "853262355518",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "baa9e32336bf",
        "lessThan": "a01634bf91f2",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "0adf571fa34b",
        "lessThan": "48866fd5c361",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "2c6b572458a9",
        "lessThan": "9619cc7d97c3",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "63346650c1a9",
        "lessThan": "25df44e90ff5",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "63346650c1a9",
        "lessThan": "6811744bd0ef",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "63346650c1a9",
        "lessThan": "bc1660206c37",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "63346650c1a9",
        "lessThan": "517a16b1a88b",
        "status": "affected",
        "versionType": "git"
      }
    ]
  },
  {
    "product": "Linux",
    "vendor": "Linux",
    "defaultStatus": "affected",
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "programFiles": [
      "net/netrom/nr_timer.c"
    ],
    "versions": [
      {
        "version": "5.0",
        "status": "affected"
      },
      {
        "version": "0",
        "lessThan": "5.0",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "4.4.277",
        "lessThanOrEqual": "4.4.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "4.9.277",
        "lessThanOrEqual": "4.9.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "4.14.241",
        "lessThanOrEqual": "4.14.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "4.19.199",
        "lessThanOrEqual": "4.19.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "5.4.136",
        "lessThanOrEqual": "5.4.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "5.10.54",
        "lessThanOrEqual": "5.10.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "5.13.6",
        "lessThanOrEqual": "5.13.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "5.14",
        "lessThanOrEqual": "*",
        "status": "unaffected",
        "versionType": "original_commit_for_fix"
      }
    ]
  }
]