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Bug 772425 (CVE-2021-27645) - <sys-libs/glibc-2.33 : Double free in nscd (CVE-2021-27645)
Summary: <sys-libs/glibc-2.33 : Double free in nscd (CVE-2021-27645)
Alias: CVE-2021-27645
Product: Gentoo Security
Classification: Unclassified
Component: Vulnerabilities (show other bugs)
Hardware: All Linux
: Normal minor (vote)
Assignee: Gentoo Security
Whiteboard: B3 [glsa+ cve]
Depends on: glibc-2.33-stable
  Show dependency tree
Reported: 2021-02-24 19:14 UTC by Sam James
Modified: 2021-07-06 03:42 UTC (History)
0 users

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


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Description Sam James archtester Gentoo Infrastructure gentoo-dev Security 2021-02-24 19:14:25 UTC
"The nameserver caching daemon (nscd) in the GNU C Library (aka glibc or libc6) 2.29 through 2.33, when processing a request for netgroup lookup, may crash due to a double-free, potentially resulting in degraded service or Denial of Service on the local system. This is related to netgroupcache.c."
Comment 1 Sam James archtester Gentoo Infrastructure gentoo-dev Security 2021-02-24 19:14:46 UTC
Guarded behind USE=nscd (non-default).
Comment 3 Larry the Git Cow gentoo-dev 2021-06-13 14:28:41 UTC
The bug has been referenced in the following commit(s):

commit 2e0e1c0418c63f7bdbecc980817b11adc09cfdd8
Author:     Andreas K. Hüttel <>
AuthorDate: 2021-06-13 14:17:15 +0000
Commit:     Andreas K. Hüttel <>
CommitDate: 2021-06-13 14:17:15 +0000

    package.mask: Extend glibc mask to <2.33
    Signed-off-by: Andreas K. Hüttel <>

 profiles/package.mask | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
Comment 4 Andreas K. Hüttel archtester gentoo-dev 2021-07-01 21:32:18 UTC
Nothing to do for toolchain here anymore
Comment 5 John Helmert III archtester Gentoo Infrastructure gentoo-dev Security 2021-07-05 02:39:15 UTC
New request filed
Comment 6 GLSAMaker/CVETool Bot gentoo-dev 2021-07-06 03:42:05 UTC
This issue was resolved and addressed in
 GLSA 202107-07 at
by GLSA coordinator John Helmert III (ajak).