| Name | CVE-2021-27645 |
| Description | 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. |
| Source | CVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more) |
| References | DLA-3152-1 |
| Debian Bugs | 983479 |
Vulnerable and fixed packages
The table below lists information on source packages.
| Source Package | Release | Version | Status |
|---|
| glibc (PTS) | jessie, jessie (lts) | 2.19-18+deb8u14 | fixed |
| stretch (security) | 2.24-11+deb9u1 | fixed |
| stretch (lts), stretch | 2.24-11+deb9u7 | fixed |
| buster (security), buster, buster (lts) | 2.28-10+deb10u4 | fixed |
| bullseye | 2.31-13+deb11u11 | fixed |
| bullseye (security) | 2.31-13+deb11u10 | fixed |
| bookworm | 2.36-9+deb12u8 | fixed |
| bookworm (security) | 2.36-9+deb12u7 | fixed |
| sid, trixie | 2.40-3 | fixed |
The information below is based on the following data on fixed versions.
| Package | Type | Release | Fixed Version | Urgency | Origin | Debian Bugs |
|---|
| glibc | source | jessie | (not affected) | | | |
| glibc | source | stretch | (not affected) | | | |
| glibc | source | buster | 2.28-10+deb10u2 | | DLA-3152-1 | |
| glibc | source | (unstable) | 2.31-10 | | | 983479 |
Notes
https://sourceware.org/bugzilla/show_bug.cgi?id=27462
Introduced by: https://sourceware.org/git/?p=glibc.git;a=commit;h=745664bd798ec8fd50438605948eea594179fba1 (glibc-2.29)
Fixed by: https://sourceware.org/git/?p=glibc.git;a=commit;h=dca565886b5e8bd7966e15f0ca42ee5cff686673
Introducing commit present in Debian since 2.28-1 with addition of
https://salsa.debian.org/glibc-team/glibc/-/commit/aea56157b456d4d9bef337d0149e952a41a7d919
[stretch] - glibc <not-affected> (Introduced around 2.28 via 745664bd798ec8fd50438605948eea594179fba1)
[jessie] - glibc <not-affected> (Introduced around 2.28 via 745664bd798ec8fd50438605948eea594179fba1)