vulnwire
5.5med

CVE-2017-18344

The timer_create syscall implementation in kernel/time/posix-timers.c in the Linux kernel before 4.14.8 doesn't properly validate the sigev…

Published 8 y ago · modified 4 mo ago · JSON

CVSS
5.5
v3.0 · NVD
CISA KEV
No
not known exploited
EPSS
3.4%
percentile 89%
Public exploits
0
none known

The timer_create syscall implementation in kernel/time/posix-timers.c in the Linux kernel before 4.14.8 doesn't properly validate the sigevent->sigev_notify field, which leads to out-of-bounds access in the show_timer function (called when /proc/$PID/timers is read). This allows userspace applications to read arbitrary kernel memory (on a kernel built with CONFIG_POSIX_TIMERS and CONFIG_CHECKPOINT_RESTORE).

Exploit prediction (EPSS)

3.44% probability of exploitation in the next 30 days, higher than 89% of all scored CVEs.

CVSS scores

Assigned byVersionScoreVector
NVD3.05.5CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
NVD2.02.1AV:L/AC:L/Au:N/C:P/I:N/A:N

Classification

Weakness
Technology feeds
Linux kernel (RSS, critical only)

References

  • access.redhat.com /errata/RHSA-2018:3540 · vendor-advisory, x_refsource_REDHAT, x_transferred
  • access.redhat.com /errata/RHSA-2018:3083 · vendor-advisory, x_refsource_REDHAT, x_transferred
  • access.redhat.com /errata/RHSA-2018:3591 · vendor-advisory, x_refsource_REDHAT, x_transferred
  • access.redhat.com /errata/RHSA-2018:3459 · vendor-advisory, x_refsource_REDHAT, x_transferred
  • securitytracker.com /id/1041414 · vdb-entry, x_refsource_SECTRACK, x_transferred
  • cdn.kernel.org /pub/linux/kernel/v4.x/ChangeLog-4.14.8 · x_refsource_MISC, x_transferred
  • access.redhat.com /errata/RHSA-2018:3590 · vendor-advisory, x_refsource_REDHAT, x_transferred
  • access.redhat.com /errata/RHSA-2018:2948 · vendor-advisory, x_refsource_REDHAT, x_transferred
  • github.com /torvalds/linux/commit/cef31d9af908243421258f1df35a4a644604efbe · x_refsource_MISC, x_transferred
  • usn.ubuntu.com /3742-2/ · vendor-advisory, x_refsource_UBUNTU, x_transferred
  • securityfocus.com /bid/104909 · vdb-entry, x_refsource_BID, x_transferred
  • usn.ubuntu.com /3742-1/ · vendor-advisory, x_refsource_UBUNTU, x_transferred
  • access.redhat.com /errata/RHSA-2018:3586 · vendor-advisory, x_refsource_REDHAT, x_transferred
  • exploit-db.com /exploits/45175/ · exploit, x_refsource_EXPLOIT-DB, x_transferred
  • access.redhat.com /errata/RHSA-2018:3096 · vendor-advisory, x_refsource_REDHAT, x_transferred

Sources

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