CVE-2021-47297

2024-05-2115:15:17

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

web.nvd.nist.gov

linux kernel

caif_seqpkt_sendmsg

net vulnerability

6.6 Medium

AI Score

Confidence

Low

0.0004 Low

EPSS

Percentile

13.2%

JSON

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

net: fix uninit-value in caif_seqpkt_sendmsg

When nr_segs equal to zero in iovec_from_user, the object
msg->msg_iter.iov is uninit stack memory in caif_seqpkt_sendmsg
which is defined in ___sys_sendmsg. So we cann’t just judge
msg->msg_iter.iov->base directlly. We can use nr_segs to judge
msg in caif_seqpkt_sendmsg whether has data buffers.

=====================================================
BUG: KMSAN: uninit-value in caif_seqpkt_sendmsg+0x693/0xf60 net/caif/caif_socket.c:542
Call Trace:
__dump_stack lib/dump_stack.c:77 [inline]
dump_stack+0x1c9/0x220 lib/dump_stack.c:118
kmsan_report+0xf7/0x1e0 mm/kmsan/kmsan_report.c:118
__msan_warning+0x58/0xa0 mm/kmsan/kmsan_instr.c:215
caif_seqpkt_sendmsg+0x693/0xf60 net/caif/caif_socket.c:542
sock_sendmsg_nosec net/socket.c:652 [inline]
sock_sendmsg net/socket.c:672 [inline]
____sys_sendmsg+0x12b6/0x1350 net/socket.c:2343
___sys_sendmsg net/socket.c:2397 [inline]
__sys_sendmmsg+0x808/0xc90 net/socket.c:2480
__compat_sys_sendmmsg net/compat.c:656 [inline]

Affected configurations

Vulners

Node

linuxlinux_kernelRange2.6.35–4.4.277

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/caif/caif_socket.c"
    ],
    "versions": [
      {
        "version": "bece7b2398d0",
        "lessThan": "d9d646acad2c",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "bece7b2398d0",
        "lessThan": "5c6d8e2f7187",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "bece7b2398d0",
        "lessThan": "ffe31dd70b70",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "bece7b2398d0",
        "lessThan": "452c3ed7bf63",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "bece7b2398d0",
        "lessThan": "9413c0abb57f",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "bece7b2398d0",
        "lessThan": "1582a02fecff",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "bece7b2398d0",
        "lessThan": "d4c7797ab151",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "bece7b2398d0",
        "lessThan": "991e634360f2",
        "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/caif/caif_socket.c"
    ],
    "versions": [
      {
        "version": "2.6.35",
        "status": "affected"
      },
      {
        "version": "0",
        "lessThan": "2.6.35",
        "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"
      }
    ]
  }
]