Description
In calc_vm_may_flags of ashmem.c, there is a possible arbitrary write to shared memory due to a permissions bypass. This could lead to local escalation of privilege by corrupting memory shared between processes, with no additional execution privileges needed. User interaction is not needed for exploitation. Product: Android Versions: Android kernel Android ID: A-142938932
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| — | Android | Android kernel | — |
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 | linux | 5.5.13-1 | — |
| Debian 13 | linux | 5.5.13-1 | — |
| Debian 12 | linux | 5.5.13-1 | — |
| Debian 8 | linux | 3.16.84-1 | DLA-2241-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 24.04 LTS | linux-raspi-realtime | No fix yet | — |
| Ubuntu 22.04 LTS | linux-riscv +2 | No fix yet | — |
| Ubuntu 20.04 LTS | linux-gke +2 | No fix yet | — |
| Ubuntu 18.04 LTS | linux | 4.15.0-99.100 | — |
| Ubuntu 18.04 LTS | linux-aws | 4.15.0-1066.70 | — |
| Ubuntu 18.04 LTS | linux-aws-5.3 | 5.3.0-1017.18~18.04.1 | — |
| Ubuntu 18.04 LTS | linux-azure-5.3 | 5.3.0-1020.21~18.04.1 | — |
| Ubuntu 18.04 LTS | linux-gcp +6 | No fix yet | — |
| Ubuntu 18.04 LTS | linux-gcp-5.3 +1 | 5.3.0-1018.19~18.04.1 | — |
| Ubuntu 18.04 LTS | linux-gke-4.15 | 4.15.0-1058.61 | — |
| Ubuntu 18.04 LTS | linux-gke-5.0 | 5.0.0-1035.36 | — |
| Ubuntu 18.04 LTS | linux-hwe | 5.3.0-51.44~18.04.2 | — |
| Ubuntu 18.04 LTS | linux-kvm | 4.15.0-1059.60 | — |
| Ubuntu 18.04 LTS | linux-oem | 4.15.0-1080.90 | — |
| Ubuntu 18.04 LTS | linux-oem-osp1 | 5.0.0-1050.55 | — |
| Ubuntu 18.04 LTS | linux-oracle | 4.15.0-1038.42 | — |
| Ubuntu 18.04 LTS | linux-oracle-5.3 | 5.3.0-1016.18~18.04.1 | — |
| Ubuntu 18.04 LTS | linux-raspi2 | 4.15.0-1061.65 | — |
| Ubuntu 18.04 LTS | linux-raspi2-5.3 | 5.3.0-1023.25~18.04.1 | — |
| Ubuntu 18.04 LTS | linux-snapdragon | 4.15.0-1077.84 | — |
| Ubuntu 16.04 LTS | linux | 4.4.0-178.208 | — |
| Ubuntu 16.04 LTS | linux-aws | 4.4.0-1106.117 | — |
| Ubuntu 16.04 LTS | linux-aws-hwe | 4.15.0-1066.70~16.04.1 | — |
| Ubuntu 16.04 LTS | linux-azure | 4.15.0-1082.92~16.04.1 | — |
| Ubuntu 16.04 LTS | linux-gcp | 4.15.0-1061.65 | — |
| Ubuntu 16.04 LTS | linux-hwe | 4.15.0-99.100~16.04.1 | — |
| Ubuntu 16.04 LTS | linux-hwe-edge | No fix yet | — |
| Ubuntu 16.04 LTS | linux-kvm | 4.4.0-1070.77 | — |
| Ubuntu 16.04 LTS | linux-oracle | 4.15.0-1038.42~16.04.1 | — |
| Ubuntu 16.04 LTS | linux-raspi2 | 4.4.0-1132.141 | — |
| Ubuntu 16.04 LTS | linux-snapdragon | 4.4.0-1136.144 | — |
Show 5 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro FIPS 18.04 LTS | linux-aws-fips +2 | No fix yet | — |
| Ubuntu Pro FIPS 16.04 LTS | linux-fips | No fix yet | — |
| Ubuntu Pro FIPS-updates 18.04 LTS | linux-aws-fips | 4.15.0-2018.18 | — |
| Ubuntu Pro FIPS-updates 18.04 LTS | linux-azure-fips | 4.15.0-2006.7 | — |
| Ubuntu Pro FIPS-updates 18.04 LTS | linux-fips | 4.15.0-1029.34 | — |
| Ubuntu Pro FIPS-updates 16.04 LTS | linux-fips | 4.4.0-1033.38 | — |
| Ubuntu Pro 14.04 LTS | linux | No fix yet | — |
| Ubuntu Pro 14.04 LTS | linux-aws | 4.4.0-1066.70 | — |
| Ubuntu Pro 14.04 LTS | linux-azure | 4.15.0-1082.92~14.04.1 | — |
| Ubuntu Pro 14.04 LTS | linux-lts-xenial | 4.4.0-178.208~14.04.1 | — |
Public exploits
Exploit or proof-of-concept code for this vulnerability is publicly available, which lowers the bar for attackers. Treat it as a reason to patch sooner.
Exploit-DB 1
- Android - ashmem Readonly Bypasses via remap_file_pages() and ASHMEM_UNPIN EDB-47921 · dos · Jan 14, 2020 · verified
Sources: PoC-in-GitHub, Metasploit Framework, Exploit-DB — updated daily. Only links are listed; no exploit code is hosted here.
Advisories 1
- DLA-2241-1 linux - security update Debian Security (DSA / DLA) · Mar 9, 2026
References
- https://source.android.com/security/bulletin/2020-01-01
- http://packetstormsecurity.com/files/155903/Android-ashmem-Read-Only-Bypasses.html
- [debian-lts-announce] 20200609 [SECURITY] [DLA 2241-1] linux security update mailing-list
- [debian-lts-announce] 20200610 [SECURITY] [DLA 2241-2] linux security update mailing-list