A locking inconsistency issue was discovered in the tty subsystem of the Linux kernel through 5.9.13. drivers/tty/tty_io.c and drivers/tty/tty_jobctrl.c may allow a read-after-free attack against TIOCGSID, aka CID-c8bcd9c5be24.
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This medium-severity CVE scores 4.4 under NVD CVSS v3. EPSS exploit-prediction score not yet available (the EPSS model rescores nightly; freshly-published CVEs typically appear within 48 hours). GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).
A locking inconsistency issue was discovered in the tty subsystem of the Linux kernel through 5.9.13. drivers/tty/tty_io.c and drivers/tty/tty_jobctrl.c may allow a read-after-free attack against TIOCGSID, aka CID-c8bcd9c5be24.
December 9, 2020
November 21, 2024
| Vendor / Ecosystem | Fixed in / Patch | Released | Source |
|---|---|---|---|
| ubuntu | linux-image-virtual-hwe-18.04-edge (5.4.0.66.69) @ focal | 2026-05-23 | ubuntu |
| ubuntu | linux-image-virtual-hwe-20.04-edge (5.8.0.44.49) @ groovy | 2026-05-23 | ubuntu |
| ubuntu | lowlatency-4.4 (4.4.0-168) @ xenial | 2026-05-23 | ubuntu |
| ubuntu | linux-image-oem-20.04 (5.6.0.1048.44) @ focal | 2026-05-23 | ubuntu |
| ubuntu | linux-image-virtual-hwe-16.04-edge (4.15.0.136.132) @ xenial | 2026-05-23 | ubuntu |
| ubuntu | linux-virtual (3.13.0.188.197) @ trusty | 2026-05-23 | ubuntu |
| ubuntu | linux-image-virtual-lts-xenial (4.4.0.203.209) @ xenial | 2026-05-23 | ubuntu |
| redhat | kernel-rt-0:4.18.0-348.rt7.130.el8 | 2021-11-09 | redhat |
| redhat | kernel-0:4.18.0-348.el8 | 2021-11-09 | redhat |
Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.
MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.
Every vendor that published an advisory referencing this CVE — pulled from our cve_vendor_advisories aggregation. Click any row for the vendor's original advisory page.
A locking inconsistency issue was discovered in the tty subsystem of the Linux kernel through 5.9.13. drivers/tty/tty_io.c and drivers/tty/tty_jobctrl.c may allow a read-after-free attack against TIOCGSID aka CID-c8bcd9c5be24.
RHSA-2021:4140 — Moderate
RHSA-2021:4356 — Moderate
Kernel Live Patch Security Notice
Linux kernel vulnerabilities
Linux kernel vulnerabilities
Linux kernel vulnerabilities
Linux kernel vulnerabilities
Linux kernel (OEM) vulnerabilities
Linux kernel vulnerabilities
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msrc · redhat
CWE-416