CVE-2026-98773
- Source
- https://cve.org/CVERecord?id=CVE-2026-98773
- Import Source
- https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-98773.json
- JSON Data
- https://api.osv.dev/v1/vulns/CVE-2026-98773
- Downstream
- Published
- 2026-10-18T15:48:09Z
- Modified
- 2026-10-20T02:30:32Z
- Summary
- USB: cdc-acm: skip URB restart in port_shutdown if disconnected
- Details
-
In the Linux kernel, the following vulnerability has been resolved:
USB: cdc-acm: skip URB restart in port_shutdown if disconnected
acm_port_shutdown() is called from the tty-port machinery whenever the last user closes the port. acm_disconnect() sets acm->disconnected and calls tty_port_tty_vhangup(), which eventually triggers port_shutdown(). At that point acm_disconnect() has already called acm_poison_urbs() and is about to free the control and read URBs.
However, acm_port_shutdown() unconditionally calls acm_unpoison_urbs() and, when the ALWAYS_POLL_CTRL quirk is set, immediately re-submits the ctrlurb and all read URBs. If the concurrent acm_disconnect() then frees those URBs and their DMA buffers while they are in-flight, the result is a use-after-free in acm_ctrl_irq() or acm_read_bulk_callback() accessing the freed DMA memory.
Fix by checking acm->disconnected after draining the delayed anchor and returning early: if we are in a disconnect path the URBs must remain poisoned and must not be resubmitted.
The early return is placed after the delayed-anchor drain loop because that loop only cancels write-side accounting (wb->use = false and autopm counter) and does not touch the hardware path.
- Database specific
{ "cna_assigner": "Linux", "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/98xxx/CVE-2026-98773.json" }- References
-
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- https://git.kernel.org/stable/c/420ca35af891d33522cc08504768ccd60a4c450a
- https://git.kernel.org/stable/c/9742905d9ed5bf23ebe4c100dec80b6bc50fb522
- https://git.kernel.org/stable/c/a0ed07b5bbb2d8fcef86810453216070691816e7
- https://git.kernel.org/stable/c/dc614d6bc991740d41d5a99ac7765c4b675dda88
- https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/98xxx/CVE-2026-98773.json
- https://nvd.nist.gov/vuln/detail/CVE-2026-98773
Affected packages
Git / git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
Affected ranges
- Type
- GIT
- Repo
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- Events
-
Introduced603d5a7110832e10165d21f9a1486399457177deFixed9742905d9ed5bf23ebe4c100dec80b6bc50fb522
- Type
- GIT
- Repo
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- Events
-
Introduced5d29d7ff8679e5a525f22da467ba33c042e8029bFixeda0ed07b5bbb2d8fcef86810453216070691816e7
- Type
- GIT
- Repo
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- Events
-
Introducedf58752ebcb35e156c85cd1a82d6579c7af3b9023Fixed420ca35af891d33522cc08504768ccd60a4c450aFixeddc614d6bc991740d41d5a99ac7765c4b675dda88
- Type
- GIT
- Repo
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- Events
-
Introduced6.12.83Fixed6.12.113
- Type
- GIT
- Repo
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- Events
-
Introduced6.18.24Fixed6.18.56
- Type
- GIT
- Repo
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- Events
-
Introduced6.1.175Fixed6.2
- Type
- GIT
- Repo
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- Events
-
Introduced6.6.136Fixed6.7
- Type
- GIT
- Repo
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- Events
-
Introduced6.19.14Fixed6.20
- Type
- GIT
- Repo
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- Events
-
Introduced7.0.1Fixed7.1
- Type
- GIT
- Repo
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- Events
-
Introducedd826061aa64cb28089bf4c73e301dd7928662b84
- Type
- GIT
- Repo
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- Events
-
Introduced8fb82e3555a7d56a05d8ef0edee9859f889c0860
- Type
- GIT
- Repo
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- Events
-
Introduced283f8162cc3c82086537cbc7dc01870dbeb07a91
- Type
- GIT
- Repo
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- Events
-
Introducedf77f10bc76c2da86b4248269472f6d971e37828b