CVE-2021-4442
- Source
- https://nvd.nist.gov/vuln/detail/CVE-2021-4442
- Import Source
- https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-4442.json
- JSON Data
- https://api.osv.dev/v1/vulns/CVE-2021-4442
- Related
- Published
- 2024-08-29T11:15:23Z
- Modified
- 2024-09-18T01:00:22Z
- Severity
-
- 5.5 (Medium) CVSS_V3 - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H CVSS Calculator
- Summary
- [none]
- Details
-
In the Linux kernel, the following vulnerability has been resolved:
tcp: add sanity tests to TCPQUEUESEQ
Qingyu Li reported a syzkaller bug where the repro changes RCV SEQ after restoring data in the receive queue.
mprotect(0x4aa000, 12288, PROTREAD) = 0 mmap(0x1ffff000, 4096, PROTNONE, MAPPRIVATE|MAPFIXED|MAPANONYMOUS, -1, 0) = 0x1ffff000 mmap(0x20000000, 16777216, PROTREAD|PROTWRITE|PROTEXEC, MAPPRIVATE|MAPFIXED|MAPANONYMOUS, -1, 0) = 0x20000000 mmap(0x21000000, 4096, PROTNONE, MAPPRIVATE|MAPFIXED|MAPANONYMOUS, -1, 0) = 0x21000000 socket(AFINET6, SOCKSTREAM, IPPROTOIP) = 3 setsockopt(3, SOLTCP, TCPREPAIR, [1], 4) = 0 connect(3, {safamily=AFINET6, sin6port=htons(0), sin6flowinfo=htonl(0), inetpton(AFINET6, "::1", &sin6addr), sin6scopeid=0}, 28) = 0 setsockopt(3, SOLTCP, TCPREPAIRQUEUE, [1], 4) = 0 sendmsg(3, {msgname=NULL, msgnamelen=0, msgiov=[{iovbase="0x0000000000000003\0\0", iovlen=20}], msgiovlen=1, msgcontrollen=0, msgflags=0}, 0) = 20 setsockopt(3, SOLTCP, TCPREPAIR, [0], 4) = 0 setsockopt(3, SOLTCP, TCPQUEUE_SEQ, [128], 4) = 0 recvfrom(3, NULL, 20, 0, NULL, NULL) = -1 ECONNRESET (Connection reset by peer)
syslog shows: [ 111.205099] TCP recvmsg seq # bug 2: copied 80, seq 0, rcvnxt 80, fl 0 [ 111.207894] WARNING: CPU: 1 PID: 356 at net/ipv4/tcp.c:2343 tcprecvmsglocked+0x90e/0x29a0
This should not be allowed. TCPQUEUESEQ should only be used when queues are empty.
This patch fixes this case, and the tx path as well.
- References
-
- https://git.kernel.org/stable/c/046f3c1c2ff450fb7ae53650e9a95e0074a61f3e
- https://git.kernel.org/stable/c/319f460237fc2965a80aa9a055044e1da7b3692a
- https://git.kernel.org/stable/c/3b72d5a703842f582502d97906f17d6ee122dac2
- https://git.kernel.org/stable/c/3bf899438c123c444f6b644a57784dfbb6b15ad6
- https://git.kernel.org/stable/c/8811f4a9836e31c14ecdf79d9f3cb7c5d463265d
- https://security-tracker.debian.org/tracker/CVE-2021-4442
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