What’s Vulnerable › Vulnerabilities
CVE-2019-19241
- Severity: high (CVSS 7.8 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 1.1% probability of exploitation in the next 30 days
- Public exploit or detection template: yes
- Published: 2019-12-17 · updated 2026-06-17
Description
In the Linux kernel before 5.4.2, the io_uring feature leads to requests that inadvertently have UID 0 and full capabilities, aka CID-181e448d8709. This is related to fs/io-wq.c, fs/io_uring.c, and net/socket.c. For example, an attacker can bypass intended restrictions on adding an IPv4 address to the loopback interface. This occurs because IORING_OP_SENDMSG operations, although requested in the context of an unprivileged user, are sometimes performed by a kernel worker thread without considering that context.
Affected products
- Linux kernel: before 5.4.2 — fixed in 5.4.2
How to fix
Upgrade to a fixed version: Linux kernel 5.4.2. Check the vendor advisory for mitigations.
References
- https://bugs.chromium.org/p/project-zero/issues/detail?id=1975
- https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.4.2
- https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=181e448d8709e517c9c7b523fcd209f24eb38ca7
- https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=d69e07793f891524c6bbf1e75b9ae69db4450953
- https://security.netapp.com/advisory/ntap-20200103-0001/
- https://usn.ubuntu.com/4284-1/
- https://bugs.chromium.org/p/project-zero/issues/detail?id=1975
- https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.4.2
- https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=181e448d8709e517c9c7b523fcd209f24eb38ca7
- https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=d69e07793f891524c6bbf1e75b9ae69db4450953
- https://security.netapp.com/advisory/ntap-20200103-0001/
- https://usn.ubuntu.com/4284-1/
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