Description
The ppp decapsulator in tcpdump 4.9.3 can be convinced to allocate a large amount of memory.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| The TCPdump Group | tcpdump | 4.9.3 | — |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | tcpdump | 4.9.3-7 | — |
| Debian 13 | tcpdump | 4.9.3-7 | — |
| Debian 12 | tcpdump | 4.9.3-7 | — |
| Debian 9 | tcpdump | 4.9.3-1~deb9u2 | DLA-2444-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 20.04 LTS | tcpdump | 4.9.3-4ubuntu0.1 | USN-5331-2 |
| Ubuntu 18.04 LTS | tcpdump | 4.9.3-0ubuntu0.18.04.2 | USN-5331-2 |
Show 2 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro 16.04 LTS | tcpdump | 4.9.3-0ubuntu0.16.04.1+esm1 | USN-5331-1 |
| Ubuntu Pro 14.04 LTS | tcpdump | No fix yet | — |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 8 | tcpdump | 14:4.9.3-2.el8 | RHSA-2021:4236 |
AlmaLinux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux 8 | tcpdump | 14:4.9.3-2.el8 | ALSA-2021:4236 |
Rocky Linux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Rocky Linux 8 | tcpdump | 4:4.9.3-2.el8 | RLSA-2021:4236 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP2 | tcpdump | 4.9.2-3.12.1 | SUSE-SU-2020:3358-1 |
| SLES 15 SP1 | tcpdump | 4.9.2-3.12.1 | SUSE-SU-2020:3358-1 |
| SLES 12 SP5 | tcpdump | 4.9.2-14.17.1 | SUSE-SU-2020:3360-1 |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES for SAP 12 SP5 | tcpdump | 4.9.2-14.17.1 | SUSE-SU-2020:3360-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | tcpdump | 4.99.1-1.2 | openSUSE-SU-2024:11425-1 |
| openSUSE Leap 15.2 | tcpdump | 4.9.2-lp152.7.3.1 | openSUSE-SU-2020:1986-1 |
| openSUSE Leap 15.1 | tcpdump | 4.9.2-lp151.4.9.1 | openSUSE-SU-2020:1983-1 |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.24 | tcpdump | 4.9.3-r1 | — |
| Alpine v3.23 | tcpdump | 4.9.3-r1 | — |
| Alpine v3.22 | tcpdump | 4.9.3-r1 | — |
| Alpine v3.21 | tcpdump | 4.9.3-r1 | — |
| Alpine v3.20 | tcpdump | 4.9.3-r1 | — |
Show 11 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.19 | tcpdump | 4.9.3-r1 | — |
| Alpine v3.18 | tcpdump | 4.9.3-r1 | — |
| Alpine v3.17 | tcpdump | 4.9.3-r1 | — |
| Alpine v3.16 | tcpdump | 4.9.3-r1 | — |
| Alpine v3.15 | tcpdump | 4.9.3-r1 | — |
| Alpine v3.14 | tcpdump | 4.9.3-r1 | — |
| Alpine v3.13 | tcpdump | 4.9.3-r1 | — |
| Alpine v3.12 | tcpdump | 4.9.3-r1 | — |
| Alpine v3.11 | tcpdump | 4.9.3-r1 | — |
| Alpine v3.10 | tcpdump | 4.9.3-r1 | — |
| Alpine v3.9 | tcpdump | 4.9.3-r1 | — |
Azure Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Azure Linux 2 (CBL-Mariner) | tcpdump | 4.9.3-3 | — |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 8 | tcpdump | 14:4.9.3-2.el8 | ELSA-2021-4236 |
Advisories 13
- ALSA-2021:4236 Low: tcpdump security and bug fix update AlmaLinux Security Advisories · Oct 29, 2026
- WID-SEC-2022-0571 Red Hat Enterprise Linux: Mehrere Schwachstellen BSI CERT-Bund (WID) · Jun 28, 2026
- USN-5331-1 tcpdump vulnerabilities Ubuntu Security Notices (USN) · Jun 25, 2026
- USN-5331-2 tcpdump vulnerabilities Ubuntu Security Notices (USN) · Apr 27, 2026
- DLA-2444-1 tcpdump - security update Debian Security (DSA / DLA) · Mar 9, 2026
- RLSA-2021:4236 Low: tcpdump security and bug fix update Rocky Linux Security Advisories · Feb 4, 2026
- SUSE-SU-2020:3358-1 Security update for tcpdump SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2020:1983-1 Security update for tcpdump SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2020:3360-1 Security update for tcpdump SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2024:11425-1 tcpdump-4.99.1-1.2 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2020:1986-1 Security update for tcpdump SUSE / openSUSE Security Updates · Feb 4, 2026
- RHSA-2021:4236 Red Hat Security Advisory: tcpdump security and bug fix update Red Hat Security Advisories (RHSA) · Nov 22, 2025
- ELSA-2021-4236 Low: tcpdump security and bug fix update (Oracle Linux 8) Oracle Linux Security Advisories (ELSA) · Nov 16, 2021
References
- https://github.com/the-tcpdump-group/tcpdump/commit/32027e199368dad9508965aae8cd8de5b6ab5231
- [debian-lts-announce] 20201110 [SECURITY] [DLA 2444-1] tcpdump security update mailing-list
- FEDORA-2020-fae2e1f2bc vendor-advisory
- FEDORA-2020-c5e78886d6 vendor-advisory
- 20210427 APPLE-SA-2021-04-26-3 Security Update 2021-002 Catalina mailing-list
- https://support.apple.com/kb/HT212325
- https://support.apple.com/kb/HT212326
- https://support.apple.com/kb/HT212327