Answer in brief
CVE-2026-72057 records a High severity (CVSS 8.2) vulnerability in net/sched: act_ct: preserve tc_skb_cb across defragmentation. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 8.2. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=ec624fe740b416fb68d536b37fb8eef46f90b5c2 <2400c4b05d58834b994500a9eec90a37db44187c || >=ec624fe740b416fb68d536b37fb8eef46f90b5c2 <5c3ae5f6c7c6de73ea9b6a75154fe4ed343e1bac || >=ec624fe740b416fb68d536b37fb8eef46f90b5c2 <b3d835407846134b0d54637c0281b39bebef831d || >=ec624fe740b416fb68d536b37fb8eef46f90b5c2 <f7f45ceb855d9ba1cba594fb3f383255f7013fad || >=ec624fe740b416fb68d536b37fb8eef46f90b5c2 <9092e15defbe6c7bc241c306093ca9d358a578e7 || 0d76daf2013ce1da20eab5e26bd81d983e1c18fb || >=5.15.13 <5.16 | 2400c4b05d58834b994500a9eec90a37db44187c, 5c3ae5f6c7c6de73ea9b6a75154fe4ed343e1bac, b3d835407846134b0d54637c0281b39bebef831d, f7f45ceb855d9ba1cba594fb3f383255f7013fad, 9092e15defbe6c7bc241c306093ca9d358a578e7, 5.16 |
| Linux/Linuxgeneric | 5.16 | Not reported |
| Linux/Linuxgeneric | >=0d76daf2013ce1da20eab5e26bd81d983e1c18fb <fb080b6f54835d5d4d11ce3122800e6f0f6689e6 || >=ec624fe740b416fb68d536b37fb8eef46f90b5c2 <67d6b00a54446c008f52cf70fc0c2ad0c712f85d || >=ec624fe740b416fb68d536b37fb8eef46f90b5c2 <2400c4b05d58834b994500a9eec90a37db44187c || >=ec624fe740b416fb68d536b37fb8eef46f90b5c2 <5c3ae5f6c7c6de73ea9b6a75154fe4ed343e1bac || >=ec624fe740b416fb68d536b37fb8eef46f90b5c2 <b3d835407846134b0d54637c0281b39bebef831d || >=ec624fe740b416fb68d536b37fb8eef46f90b5c2 <f7f45ceb855d9ba1cba594fb3f383255f7013fad || >=ec624fe740b416fb68d536b37fb8eef46f90b5c2 <9092e15defbe6c7bc241c306093ca9d358a578e7 || >=5.15.13 <5.15.217 | fb080b6f54835d5d4d11ce3122800e6f0f6689e6, 67d6b00a54446c008f52cf70fc0c2ad0c712f85d, 2400c4b05d58834b994500a9eec90a37db44187c, 5c3ae5f6c7c6de73ea9b6a75154fe4ed343e1bac, b3d835407846134b0d54637c0281b39bebef831d, f7f45ceb855d9ba1cba594fb3f383255f7013fad, 9092e15defbe6c7bc241c306093ca9d358a578e7, 5.15.217 |
Published upstream
Aug 15, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 23, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 15, 2026
In the Linux kernel, the following vulnerability has been resolved: net/sched: act_ct: preserve tc_skb_cb across defragmentation tcf_ct_handle_fragments() calls nf_ct_handle_fragments() without saving and restoring skb->cb. The defrag helper clears IPCB/IP6CB, which aliases the tc_skb_cb/qdisc_skb_cb control buffer. Fragmented traffic through act_ct therefore loses qdisc metadata such as pkt_segs and can trigger WARN_ON_ONCE() in qdisc_pkt_segs() when panic_on_warn is enabled. Save and restore the full tc_skb_cb around nf_ct_handle_fragments(), matching the pattern used by ovs_ct_handle_fragments().
Quoted source text, attributed separately from HOL analysis.