Description
In the Linux kernel, the following vulnerability has been resolved:
comedi: runflags cannot determine whether to reclaim chanlist
syzbot reported a memory leak [1], because commit 4e1da516debb ("comedi:
Add reference counting for Comedi command handling") did not consider
the exceptional exit case in do_cmd_ioctl() where runflags is not set.
This caused chanlist not to be properly freed by do_become_nonbusy(),
as it only frees chanlist when runflags is correctly set.
Added a check in do_become_nonbusy() for the case where runflags is not
set, to properly free the chanlist memory.
[1]
BUG: memory leak
backtrace (crc 844a0efa):
__comedi_get_user_chanlist drivers/comedi/comedi_fops.c:1815 [inline]
do_cmd_ioctl.part.0+0x112/0x350 drivers/comedi/comedi_fops.c:1890
do_cmd_ioctl drivers/comedi/comedi_fops.c:1858 [inline]
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Linux | Linux | 6.19 | 6.19.12 |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | linux | 6.19.12-1 | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 26.04 LTS | linux-nvidia | 7.0.0-1006.6 | — |
| Ubuntu 24.04 LTS | linux-riscv +15 | No fix yet | — |
| Ubuntu 22.04 LTS | linux-riscv +32 | No fix yet | — |
| Ubuntu 20.04 LTS | linux-gke +28 | No fix yet | — |
| Ubuntu 18.04 LTS | linux-gcp +14 | No fix yet | — |
Show 2 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 16.04 LTS | linux-hwe-edge | No fix yet | — |
| Ubuntu Pro Realtime 24.04 LTS | linux-realtime-6.14 | No fix yet | — |
Advisories 1
- WID-SEC-2026-1346 Linux Kernel: Mehrere Schwachstellen BSI CERT-Bund (WID) · Nov 12, 2026