CVE-2025-21954
- Source
- https://nvd.nist.gov/vuln/detail/CVE-2025-21954
- Import Source
- https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2025-21954.json
- JSON Data
- https://api.test.osv.dev/v1/vulns/CVE-2025-21954
- Downstream
- Published
- 2025-04-01T15:46:55Z
- Modified
- 2025-10-10T07:43:32.406678Z
- Summary
- netmem: prevent TX of unreadable skbs
- Details
-
In the Linux kernel, the following vulnerability has been resolved:
netmem: prevent TX of unreadable skbs
Currently on stable trees we have support for netmem/devmem RX but not TX. It is not safe to forward/redirect an RX unreadable netmem packet into the device's TX path, as the device may call dma-mapping APIs on dma addrs that should not be passed to it.
Fix this by preventing the xmit of unreadable skbs.
Tested by configuring tc redirect:
sudo tc qdisc add dev eth1 ingress sudo tc filter add dev eth1 ingress protocol ip prio 1 flower ipproto \ tcp srcip 192.168.1.12 action mirred egress redirect dev eth1
Before, I see unreadable skbs in the driver's TX path passed to dma mapping APIs.
After, I don't see unreadable skbs in the driver's TX path passed to dma mapping APIs.
- References
Affected packages
Git / git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
Affected ranges
- Type
- GIT
- Repo
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- Events
-
Introduced65249feb6b3df9e17bab5911ee56fa7b0971e231Fixed454825019d2f0c59e5174ece9e713f45ad80beff
- Type
- GIT
- Repo
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- Events
-
Introduced65249feb6b3df9e17bab5911ee56fa7b0971e231Fixed1c17c8ced25c5fbe424c7ad7ea11d33014a986b1
- Type
- GIT
- Repo
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- Events
-
Introduced65249feb6b3df9e17bab5911ee56fa7b0971e231Fixedf3600c867c99a2cc8038680ecf211089c50e7971