CVE-2021-47243
- Source
- https://nvd.nist.gov/vuln/detail/CVE-2021-47243
- Import Source
- https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2021-47243.json
- JSON Data
- https://api.test.osv.dev/v1/vulns/CVE-2021-47243
- Related
- Published
- 2024-05-21T15:15:13Z
- Modified
- 2024-12-30T19:04:26Z
- Severity
-
- 7.1 (High) CVSS_V3 - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H CVSS Calculator
- Summary
- [none]
- Details
-
In the Linux kernel, the following vulnerability has been resolved:
sch_cake: Fix out of bounds when parsing TCP options and header
The TCP option parser in cake qdisc (cakegettcpopt and caketcphmaydrop) could read one byte out of bounds. When the length is 1, the execution flow gets into the loop, reads one byte of the opcode, and if the opcode is neither TCPOPTEOL nor TCPOPT_NOP, it reads one more byte, which exceeds the length of 1.
This fix is inspired by commit 9609dad263f8 ("ipv4: tcp_input: fix stack out of bounds when parsing TCP options.").
v2 changes:
Added doff validation in cakegettcphdr to avoid parsing garbage as TCP header. Although it wasn't strictly an out-of-bounds access (memory was allocated), garbage values could be read where CAKE expected the TCP header if doff was smaller than 5.
- References
-
- https://git.kernel.org/stable/c/3371392c60e2685af30bd4547badd880f5df2b3f
- https://git.kernel.org/stable/c/3b491dd593d582ceeb27aa617600712a6bd14246
- https://git.kernel.org/stable/c/4cefa061fc63f4d2dff5ab4083f43857cd7a2335
- https://git.kernel.org/stable/c/595897ef118d6fe66690c4fc5b572028c9da95b7
- https://git.kernel.org/stable/c/ba91c49dedbde758ba0b72f57ac90b06ddf8e548
- https://security-tracker.debian.org/tracker/CVE-2021-47243
Affected packages
Debian:11 / linux
Package
- Name
- linux
- Purl
- pkg:deb/debian/linux?arch=source
Debian:12 / linux
Package
- Name
- linux
- Purl
- pkg:deb/debian/linux?arch=source
Debian:13 / linux
Package
- Name
- linux
- Purl
- pkg:deb/debian/linux?arch=source