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In the Linux kernel, the following vulnerability has been resolved:
ppp_synctty: ensure a writeable skb header
ppp_sync_txmunge() checks headroom before prepending the address and control bytes, but does not ensure that the skb header is writable. A received skb can reach this function through PPP channel bridging without passing through ppp_start_xmit(), which calls skb_cow_head().
For example, a PPPoE frame may share its buffer with a clone queued to an AF_PACKET socket. If it is bridged to a synchronous tty channel, the address/control bytes can overwrite data still visible to that socket.
Use skb_cow_head() to ensure both sufficient headroom and a writable header.
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Amazon_linux_2023 | — | Upgrade kernel6.12-tools-debuginfoUpgrade kernel-livepatch-6.12.111-136.204Upgrade kernel6.12-debuginfoUpgrade kernel6.12-headersUpgrade python3-perf6.12Upgrade kernel6.12-toolsUpgrade perf6.12Upgrade kernel6.12-develUpgrade bpftool6.12Upgrade python3-perf6.12-debuginfoUpgrade kernel6.12-debuginfo-common-aarch64Upgrade perf6.12-debuginfoUpgrade kernel6.12-modules-extraUpgrade bpftool6.12-debuginfoUpgrade kernel6.12-modules-extra-commonUpgrade kernel6.12-debuginfo-common-x86_64Upgrade kernel6.12Upgrade kernel6.12-tools-devel | Oct 13, 2026 | Sep 25, 2026 |
| Debian | — | Upgrade linux-6.12Upgrade linux | Sep 30, 2026 | Sep 25, 2026 |
| Oracle_linux | — | Upgrade kernel-uek | Oct 22, 2026 | Sep 25, 2026 |
| Redhat_linux | — | No solution exists | Oct 1, 2026 | Sep 25, 2026 |
| Vmware Photon_os | — | Use 'tdnf update' to upgrade all packages to the latest version. | Oct 13, 2026 | Sep 25, 2026 |
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