Bug 1656472 (CVE-2018-16880)
| Summary: | CVE-2018-16880 kernel: Out of bounds write in get_rx_bufs() function in drivers/vhost/net.c | ||
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| Product: | [Other] Security Response | Reporter: | Pedro Sampaio <psampaio> |
| Component: | vulnerability | Assignee: | Red Hat Product Security <security-response-team> |
| Status: | CLOSED NOTABUG | QA Contact: | |
| Severity: | high | Docs Contact: | |
| Priority: | high | ||
| Version: | unspecified | CC: | acaringi, airlied, bhu, blc, brdeoliv, bskeggs, dhoward, dvlasenk, fhrbata, hdegoede, hkrzesin, hwkernel-mgr, iboverma, ichavero, itamar, jarodwilson, jasowang, jeremy, jforbes, jglisse, jkacur, john.j5live, jonathan, josef, jross, jstancek, jwboyer, kernel-maint, kernel-mgr, labbott, lgoncalv, linville, matt, mchehab, mcressma, mjg59, mlangsdo, nmurray, plougher, rt-maint, rvrbovsk, security-response-team, steved, vdronov, williams |
| Target Milestone: | --- | Keywords: | Security |
| Target Release: | --- | ||
| Hardware: | All | ||
| OS: | Linux | ||
| Whiteboard: | |||
| Fixed In Version: | Doc Type: | If docs needed, set a value | |
| Doc Text: |
A flaw was found in the Linux kernel's handle_rx() function in the [vhost_net] driver. A malicious virtual guest, under specific conditions, can trigger an out-of-bounds write in a kmalloc-8 slab on a virtual host which may lead to a kernel memory corruption and a system panic. Due to the nature of the flaw, privilege escalation cannot be fully ruled out.
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Story Points: | --- |
| Clone Of: | Environment: | ||
| Last Closed: | 2019-06-10 10:43:39 UTC | Type: | --- |
| Regression: | --- | Mount Type: | --- |
| Documentation: | --- | CRM: | |
| Verified Versions: | Category: | --- | |
| oVirt Team: | --- | RHEL 7.3 requirements from Atomic Host: | |
| Cloudforms Team: | --- | Target Upstream Version: | |
| Embargoed: | |||
| Bug Depends On: | 1668665, 1668666, 1669545 | ||
| Bug Blocks: | 1656474 | ||
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Description
Pedro Sampaio
2018-12-05 15:22:09 UTC
Acknowledgements: Name: Jason Wang (Red Hat) Notes on the flaw's impact: > is this guest triggerable (guest -> host) or host -> host? a vm guest can trigger an oob-write on a host but requires a large network packet to be received for it. > what is overwritten? kmalloc-8 slab on a vm host. > what's the minimum and maximum size of the out-of-bound write? from 8 bytes (sizeof vring_used_elem) to 504 bytes (63 * sizeof(vring_used_elem)) > does the attacker control the data that are written and if yes, to which degree? attacker can not directly control the data. Created kernel tracking bugs for this issue: Affects: fedora-all [bug 1669545] |