CVE-2021-4439
See a problem?- Source
- https://nvd.nist.gov/vuln/detail/CVE-2021-4439
- Import Source
- https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-4439.json
- JSON Data
- https://api.osv.dev/v1/vulns/CVE-2021-4439
- Related
- Published
- 2024-06-20T12:15:10Z
- Modified
- 2024-09-18T17:48:29.625492Z
- Severity
-
- 7.8 (High) CVSS_V3 - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H CVSS Calculator
- Summary
- [none]
- Details
-
In the Linux kernel, the following vulnerability has been resolved:
isdn: cpai: check ctr->cnr to avoid array index out of bound
The cmtpaddconnection() would add a cmtp session to a controller and run a kernel thread to process cmtp.
__module_get(THIS_MODULE); session->task = kthread_run(cmtp_session, session, "kcmtpd_ctr_%d", session->num);During this process, the kernel thread would call detachcapictr() to detach a register controller. if the controller was not attached yet, detachcapictr() would trigger an array-index-out-bounds bug.
[ 46.866069][ T6479] UBSAN: array-index-out-of-bounds in drivers/isdn/capi/kcapi.c:483:21 [ 46.867196][ T6479] index -1 is out of range for type 'capictr *[32]' [ 46.867982][ T6479] CPU: 1 PID: 6479 Comm: kcmtpdctr0 Not tainted 5.15.0-rc2+ #8 [ 46.869002][ T6479] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.14.0-2 04/01/2014 [ 46.870107][ T6479] Call Trace: [ 46.870473][ T6479] dumpstacklvl+0x57/0x7d [ 46.870974][ T6479] ubsanepilogue+0x5/0x40 [ 46.871458][ T6479] _ubsanhandleoutofbounds.cold+0x43/0x48 [ 46.872135][ T6479] detachcapictr+0x64/0xc0 [ 46.872639][ T6479] cmtpsession+0x5c8/0x5d0 [ 46.873131][ T6479] ? _initwaitqueuehead+0x60/0x60 [ 46.873712][ T6479] ? cmtpaddmsgpart+0x120/0x120 [ 46.874256][ T6479] kthread+0x147/0x170 [ 46.874709][ T6479] ? setkthreadstruct+0x40/0x40 [ 46.875248][ T6479] retfrom_fork+0x1f/0x30 [ 46.875773][ T6479]
- References
-
- https://git.kernel.org/stable/c/1f3e2e97c003f80c4b087092b225c8787ff91e4d
- https://git.kernel.org/stable/c/24219a977bfe3d658687e45615c70998acdbac5a
- https://git.kernel.org/stable/c/285e9210b1fab96a11c0be3ed5cea9dd48b6ac54
- https://git.kernel.org/stable/c/7d91adc0ccb060ce564103315189466eb822cc6a
- https://git.kernel.org/stable/c/7f221ccbee4ec662e2292d490a43ce6c314c4594
- https://git.kernel.org/stable/c/9b6b2db77bc3121fe435f1d4b56e34de443bec75
- https://git.kernel.org/stable/c/cc20226e218a2375d50dd9ac14fb4121b43375ff
- https://git.kernel.org/stable/c/e8b8de17e164c9f1b7777f1c6f99d05539000036
- https://security-tracker.debian.org/tracker/CVE-2021-4439
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