// For flags

CVE-2021-47297

net: fix uninit-value in caif_seqpkt_sendmsg

Severity Score

5.5
*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

0
*Multiple Sources

Exploited in Wild

-
*KEV

Decision

Track
*SSVC
Descriptions

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]

En el kernel de Linux, se resolvió la siguiente vulnerabilidad: net: corrige el valor uninit en caif_seqpkt_sendmsg. Cuando nr_segs es igual a cero en iovec_from_user, el objeto msg->msg_iter.iov es la memoria de pila uninit en caif_seqpkt_sendmsg que está definida en ___sys_sendmsg. Entonces no podemos simplemente juzgar msg->msg_iter.iov->base directamente. Podemos usar nr_segs para juzgar si msg en caif_seqpkt_sendmsg tiene buffers de datos. ==================================================== === BUG: KMSAN: valor uninit en caif_seqpkt_sendmsg+0x693/0xf60 net/caif/caif_socket.c:542 Seguimiento de llamadas: __dump_stack lib/dump_stack.c:77 [en línea] 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/so cket.c: 652 [en línea] sock_sendmsg net/socket.c:672 [en línea] ____sys_sendmsg+0x12b6/0x1350 net/socket.c:2343 ___sys_sendmsg net/socket.c:2397 [en línea] __sys_sendmmsg+0x808/0xc90 80 __compat_sys_sendmmsg net/compat.c:656 [en línea]

*Credits: N/A
CVSS Scores
Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High
* Common Vulnerability Scoring System
SSVC
  • Decision:Track
Exploitation
None
Automatable
No
Tech. Impact
Partial
* Organization's Worst-case Scenario
Timeline
  • 2024-05-21 CVE Reserved
  • 2024-05-21 CVE Published
  • 2024-05-22 EPSS Updated
  • 2024-12-19 CVE Updated
  • ---------- Exploited in Wild
  • ---------- KEV Due Date
  • ---------- First Exploit
CWE
CAPEC
Affected Vendors, Products, and Versions
Vendor Product Version Other Status
Vendor Product Version Other Status <-- --> Vendor Product Version Other Status
Linux
Search vendor "Linux"
Linux Kernel
Search vendor "Linux" for product "Linux Kernel"
>= 2.6.35 < 4.4.277
Search vendor "Linux" for product "Linux Kernel" and version " >= 2.6.35 < 4.4.277"
en
Affected
Linux
Search vendor "Linux"
Linux Kernel
Search vendor "Linux" for product "Linux Kernel"
>= 2.6.35 < 4.9.277
Search vendor "Linux" for product "Linux Kernel" and version " >= 2.6.35 < 4.9.277"
en
Affected
Linux
Search vendor "Linux"
Linux Kernel
Search vendor "Linux" for product "Linux Kernel"
>= 2.6.35 < 4.14.241
Search vendor "Linux" for product "Linux Kernel" and version " >= 2.6.35 < 4.14.241"
en
Affected
Linux
Search vendor "Linux"
Linux Kernel
Search vendor "Linux" for product "Linux Kernel"
>= 2.6.35 < 4.19.199
Search vendor "Linux" for product "Linux Kernel" and version " >= 2.6.35 < 4.19.199"
en
Affected
Linux
Search vendor "Linux"
Linux Kernel
Search vendor "Linux" for product "Linux Kernel"
>= 2.6.35 < 5.4.136
Search vendor "Linux" for product "Linux Kernel" and version " >= 2.6.35 < 5.4.136"
en
Affected
Linux
Search vendor "Linux"
Linux Kernel
Search vendor "Linux" for product "Linux Kernel"
>= 2.6.35 < 5.10.54
Search vendor "Linux" for product "Linux Kernel" and version " >= 2.6.35 < 5.10.54"
en
Affected
Linux
Search vendor "Linux"
Linux Kernel
Search vendor "Linux" for product "Linux Kernel"
>= 2.6.35 < 5.13.6
Search vendor "Linux" for product "Linux Kernel" and version " >= 2.6.35 < 5.13.6"
en
Affected
Linux
Search vendor "Linux"
Linux Kernel
Search vendor "Linux" for product "Linux Kernel"
>= 2.6.35 < 5.14
Search vendor "Linux" for product "Linux Kernel" and version " >= 2.6.35 < 5.14"
en
Affected