CVE-2026-99026
net: team: free skb when broadcast has no txable port
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Description
In the Linux kernel, the following vulnerability has been resolved: net: team: free skb when broadcast has no txable port bc_transmit() sends the original skb through the last txable port. When no port is txable, it returns false without consuming the skb, but team_xmit() still returns NETDEV_TX_OK. AF_PACKET sends then retain the skb and its socket write-memory charge. A TX-enabled, link-down port keeps the broadcast transmit op installed. Carrier can stay up through a second link-up, TX-disabled port or be forced on by userspace. Free the original skb on the no-port path while leaving the existing drop accounting intact. Discovered by Sashiko during review of previous commit.
Affected products and packages
CNA (CVE.org)
| Vendor | Product | Versions |
|---|---|---|
| Linux | Linux | affected: 5fc889911a99043a97da1daa0d010ad72cbc3042 … < 961563117626f4681623077ec0cfd86f86da0d49 affected: 5fc889911a99043a97da1daa0d010ad72cbc3042 … < f34b1bcac4581a5bd3daf9eff90f175e736b54aa affected: 5fc889911a99043a97da1daa0d010ad72cbc3042 … < 489114c9ecae44e523361a4b3e610ee5ebd9189c default: unaffected |
| Linux | Linux | affected: 3.6 unaffected: 0 … < 3.6 unaffected: 6.18.57 … <= 6.18.* unaffected: 7.2.11 … <= 7.2.* unaffected: 7.3 … <= * default: affected |
Open-source packages (GitHub Advisory / OSV)
net: team: free skb when broadcast has no txable port
| Ecosystem | Package | Affected versions | Fixed in |
|---|---|---|---|
| >= 5fc889911a99043a97da1daa0d010ad72cbc3042, < 961563117626f4681623077ec0cfd86f86da0d49; < f34b1bcac4581a5bd3daf9eff90f175e736b54aa; < 489114c9ecae44e523361a4b3e610ee5ebd9189c | 961563117626f4681623077ec0cfd86f86da0d49, f34b1bcac4581a5bd3daf9eff90f175e736b54aa, 489114c9ecae44e523361a4b3e610ee5ebd9189c | ||
| Linux | Kernel | >= 3.6.0, < 6.18.57; >= 6.19.0, < 7.2.11 | 6.18.57, 7.2.11 |
Linux distribution status
References (6)
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git OSV
- https://git.kernel.org/stable/c/489114c9ecae44e523361a4b3e610ee5ebd9189c NVD, CNA, OSV
- https://git.kernel.org/stable/c/961563117626f4681623077ec0cfd86f86da0d49 NVD, CNA, OSV
- https://git.kernel.org/stable/c/f34b1bcac4581a5bd3daf9eff90f175e736b54aa NVD, CNA, OSV
- https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/99xxx/CVE-2026-99026.json OSV
- https://nvd.nist.gov/vuln/detail/CVE-2026-99026 OSV