Description
An issue was discovered in Squid 5.x before 5.0.3. Due to an Incorrect Synchronization, a Denial of Service can occur when processing objects in an SMP cache because of an Ipc::Mem::PageStack::pop ABA problem during access to the memory page/slot management list.
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.
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP2 | squid | 4.12-5.20.1 | SUSE-SU-2020:1769-1 |
| SLES 15 SP1 | squid | 4.12-5.20.1 | SUSE-SU-2020:1769-1 |
| SLES 15 | squid | 4.12-5.20.1 | SUSE-SU-2020:1769-1 |
| SLES 12 SP5 | squid | 4.12-4.12.1 | SUSE-SU-2020:1770-1 |
| SLES 12 SP4 | squid | 3.5.21-26.26.1 | SUSE-SU-2020:1803-1 |
Show 15 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 12 SP3 | squid | 3.5.21-26.26.1 | SUSE-SU-2020:1803-1 |
| SLES 12 SP2 | squid | 3.5.21-26.26.1 | SUSE-SU-2020:1803-1 |
| SLES 11 SP4 | squid3 | 3.1.23-8.16.37.12.1 | SUSE-SU-2020:14460-1 |
| SLES for SAP 15 | squid | 4.12-5.20.1 | SUSE-SU-2020:1769-1 |
| SLES for SAP 12 SP5 | squid | 4.12-4.12.1 | SUSE-SU-2020:1770-1 |
| SLES for SAP 12 SP4 | squid | 3.5.21-26.26.1 | SUSE-SU-2020:1803-1 |
| SLES for SAP 12 SP3 | squid | 3.5.21-26.26.1 | SUSE-SU-2020:1803-1 |
| SLES for SAP 12 SP2 | squid | 3.5.21-26.26.1 | SUSE-SU-2020:1803-1 |
| SLE HPC 15 | squid | 4.12-5.20.1 | SUSE-SU-2020:1769-1 |
| SUSE OpenStack Cloud Crowbar 8 | squid | 3.5.21-26.26.1 | SUSE-SU-2020:1803-1 |
| SUSE OpenStack Cloud 8 | squid | 3.5.21-26.26.1 | SUSE-SU-2020:1803-1 |
| SUSE OpenStack Cloud 7 | squid | 3.5.21-26.26.1 | SUSE-SU-2020:1803-1 |
| SUSE Linux Enterprise Point of Sale 11 SP3 | squid3 | 3.1.23-8.16.37.12.1 | SUSE-SU-2020:14460-1 |
| SUSE HPE Helion OpenStack 8 | squid | 3.5.21-26.26.1 | SUSE-SU-2020:1803-1 |
| SUSE Enterprise Storage 5 | squid | 3.5.21-26.26.1 | SUSE-SU-2020:1803-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | squid | 4.16-1.5 | openSUSE-SU-2024:11403-1 |
| openSUSE Leap 15.2 | squid | 4.12-lp152.2.3.1 | openSUSE-SU-2020:0914-1 |
| openSUSE Leap 15.1 | squid | 4.12-lp151.2.21.1 | openSUSE-SU-2020:0910-1 |
Advisories 8
- SUSE-SU-2020:1770-1 Security update for squid SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2020:1803-1 Security update for squid SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2020:0910-1 Security update for squid SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2024:11403-1 squid-4.16-1.5 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2020:1769-1 Security update for squid SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2020:0914-1 Security update for squid SUSE / openSUSE Security Updates · May 7, 2025
- SUSE-SU-2020:14460-1 Security update for squid3 SUSE / openSUSE Security Updates · May 2, 2025
- WID-SEC-2023-1360 Squid: Mehrere Schwachstellen ermöglichen Denial of Service BSI CERT-Bund (WID) · Jun 6, 2023