CVE-2021-4454
- Source
- https://nvd.nist.gov/vuln/detail/CVE-2021-4454
- Import Source
- https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-4454.json
- JSON Data
- https://api.osv.dev/v1/vulns/CVE-2021-4454
- Related
- Published
- 2025-03-27T17:15:35Z
- Modified
- 2025-03-28T18:49:44.466432Z
- Downstream
- Summary
- [none]
- Details
-
In the Linux kernel, the following vulnerability has been resolved:
can: j1939: fix errant WARNONONCE in j1939sessiondeactivate
The conclusion "j1939sessiondeactivate() should be called with a session ref-count of at least 2" is incorrect. In some concurrent scenarios, j1939sessiondeactivate can be called with the session ref-count less than 2. But there is not any problem because it will check the session active state before session putting in j1939sessiondeactivate_locked().
Here is the concurrent scenario of the problem reported by syzbot and my reproduction log.
cpu0 cpu1 j1939_xtp_rx_eomaj1939xtprxabortone j1939sessiongetbyaddr [kref == 2] j1939sessiongetbyaddr [kref == 3] j1939sessiondeactivate [kref == 2] j1939sessionput [kref == 1] j1939sessioncompleted j1939sessiondeactivate WARNONONCE(kref < 2)
===================================================== WARNING: CPU: 1 PID: 21 at net/can/j1939/transport.c:1088 j1939sessiondeactivate+0x5f/0x70 CPU: 1 PID: 21 Comm: ksoftirqd/1 Not tainted 5.14.0-rc7+ #32 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.13.0-1ubuntu1 04/01/2014 RIP: 0010:j1939sessiondeactivate+0x5f/0x70 Call Trace: j1939sessiondeactivateactivatenext+0x11/0x28 j1939xtprxeoma+0x12a/0x180 j1939tprecv+0x4a2/0x510 j1939canrecv+0x226/0x380 canrcvfilter+0xf8/0x220 canreceive+0x102/0x220 ? processbacklog+0xf0/0x2c0 canrcv+0x53/0xf0 _netifreceiveskbonecore+0x67/0x90 ? processbacklog+0x97/0x2c0 _netifreceive_skb+0x22/0x80
- References
-
- https://git.kernel.org/stable/c/1740a1e45eee65099a92fb502e1e67e63aad277d
- https://git.kernel.org/stable/c/6950df42a03c9ac9290503ced3f371199cb68fa9
- https://git.kernel.org/stable/c/9ab896775f98ff54b68512f345eed178bf961084
- https://git.kernel.org/stable/c/b6d44072117bba057d50f7a2f96e5d070c65926d
- https://git.kernel.org/stable/c/d0553680f94c49bbe0e39eb50d033ba563b4212d
- https://security-tracker.debian.org/tracker/CVE-2021-4454
Affected packages
Debian:11 / linux
Package
- Name
- linux
- Purl
- pkg:deb/debian/linux?arch=source
Affected ranges
- Type
- ECOSYSTEM
- Events
-
Introduced0Unknown introduced version / All previous versions are affectedFixed5.10.178-1
Affected versions
5.*
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