Answer in brief
CVE-2026-72057 records a Unknown severity 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). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
A CVSS score is not reported in the current record. 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). 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 |
Published upstream
Aug 15, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 15, 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.
Answer in brief
CVE-2026-72057 records a Unknown severity 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). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
A CVSS score is not reported in the current record. 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). 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 |
Published upstream
Aug 15, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 15, 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.