CVE-2019-19241
For example, an attacker can bypass intended restrictions on adding an IPv4 address to the loopback interface.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (1.09%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
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.
- CVSS 3.1
- 7.8 HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- EPSS
- 1.09% probability · 63th percentile
- CISA KEV
- Not listed
- Affected
- linux/linux kernel
- Source
- cve@mitre.org
References
- https://bugs.chromium.org/p/project-zero/issues/detail?id=1975Mailing List, Third Party Advisory
- https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.4.2Mailing List, Vendor Advisory
- https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=181e448d8709e517c9c7b523fcd209f24eb38ca7Patch, Vendor Advisory
- https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=d69e07793f891524c6bbf1e75b9ae69db4450953Patch, Vendor Advisory
- https://security.netapp.com/advisory/ntap-20200103-0001/
- https://usn.ubuntu.com/4284-1/
- https://bugs.chromium.org/p/project-zero/issues/detail?id=1975Mailing List, Third Party Advisory
- https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.4.2Mailing List, Vendor Advisory
- https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=181e448d8709e517c9c7b523fcd209f24eb38ca7Patch, Vendor Advisory
- https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=d69e07793f891524c6bbf1e75b9ae69db4450953Patch, Vendor Advisory
- https://security.netapp.com/advisory/ntap-20200103-0001/
- https://usn.ubuntu.com/4284-1/
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.