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Bug 753773 (CVE-2020-26950) - <www-client/firefox{,-bin}-{78.4.1, 82.0.3}: Use-after-free via MCallGetProperty opcode (CVE-2020-26950)
Summary: <www-client/firefox{,-bin}-{78.4.1, 82.0.3}: Use-after-free via MCallGetPrope...
Alias: CVE-2020-26950
Product: Gentoo Security
Classification: Unclassified
Component: Vulnerabilities (show other bugs)
Hardware: All Linux
: Normal major (vote)
Assignee: Gentoo Security
Whiteboard: A2 [glsa+ cve]
Depends on:
Reported: 2020-11-09 20:02 UTC by Sam James
Modified: 2020-11-11 03:49 UTC (History)
1 user (show)

See Also:
Package list:
Runtime testing required: ---


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Description Sam James archtester Gentoo Infrastructure gentoo-dev Security 2020-11-09 20:02:21 UTC
Summary: Write side effects in MCallGetProperty opcode not accounted for

"In certain circumstances, the MCallGetProperty opcode can be emitted with unmet assumptions resulting in an exploitable use-after-free condition."
Comment 1 Sam James archtester Gentoo Infrastructure gentoo-dev Security 2020-11-09 21:13:42 UTC
For observers: note that the appropriate versions have already been stabilised and we're just pending a GLSA now.
Comment 2 GLSAMaker/CVETool Bot gentoo-dev 2020-11-11 03:49:50 UTC
This issue was resolved and addressed in
 GLSA 202011-07 at
by GLSA coordinator Sam James (sam_c).