Answer in brief
CVE-2026-64207 records a Medium severity (CVSS 5.5) vulnerability in net/sched: dualpi2: fix GSO backlog accounting. 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.
CVSS is 5.5. 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.
| Product | Affected versions | Fixed versions |
|---|---|---|
| cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* | Not reported | Not reported |
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=8f9516daedd67097a0c6e463fcb7a42b5ee9d477 <c4b70c1512b8f9f33f23c2c8196dfd1210207681 || >=8f9516daedd67097a0c6e463fcb7a42b5ee9d477 <806586e33891066487db1f002be3d455cda6b516 || >=8f9516daedd67097a0c6e463fcb7a42b5ee9d477 <05ed733b65ab977dd931e7f7ac0f62fdb81205c2 | c4b70c1512b8f9f33f23c2c8196dfd1210207681, 806586e33891066487db1f002be3d455cda6b516, 05ed733b65ab977dd931e7f7ac0f62fdb81205c2 |
| Linux/Linuxgeneric | 6.17 | Not reported |
Published upstream
Jul 20, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 17, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 12, 2026
In the Linux kernel, the following vulnerability has been resolved: net/sched: dualpi2: fix GSO backlog accounting When DualPI2 splits a GSO skb into N segments, it propagates N additional packets to its parent before returning NET_XMIT_SUCCESS. The parent then accounts for the original skb once more, leaving its qlen one larger than the number of packets actually queued. With QFQ as the parent, after all real packets are dequeued, QFQ still has a non-zero qlen while its in-service aggregate has no active classes. qfq_choose_next_agg() returns NULL and qfq_dequeue() passes the result to qfq_peek_skb(), causing a NULL pointer dereference. Follow the same pattern used by tbf_segment() and taprio: count only successfully queued segments, propagate the difference between the original skb and those segments, and return NET_XMIT_SUCCESS whenever at least one segment was queued.
Quoted source text, attributed separately from HOL analysis.
Answer in brief
CVE-2026-64207 records a Medium severity (CVSS 5.5) vulnerability in net/sched: dualpi2: fix GSO backlog accounting. 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.
CVSS is 5.5. 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.
| Product | Affected versions | Fixed versions |
|---|---|---|
| cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* | Not reported | Not reported |
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=8f9516daedd67097a0c6e463fcb7a42b5ee9d477 <c4b70c1512b8f9f33f23c2c8196dfd1210207681 || >=8f9516daedd67097a0c6e463fcb7a42b5ee9d477 <806586e33891066487db1f002be3d455cda6b516 || >=8f9516daedd67097a0c6e463fcb7a42b5ee9d477 <05ed733b65ab977dd931e7f7ac0f62fdb81205c2 | c4b70c1512b8f9f33f23c2c8196dfd1210207681, 806586e33891066487db1f002be3d455cda6b516, 05ed733b65ab977dd931e7f7ac0f62fdb81205c2 |
| Linux/Linuxgeneric | 6.17 | Not reported |
Published upstream
Jul 20, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 17, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 12, 2026
In the Linux kernel, the following vulnerability has been resolved: net/sched: dualpi2: fix GSO backlog accounting When DualPI2 splits a GSO skb into N segments, it propagates N additional packets to its parent before returning NET_XMIT_SUCCESS. The parent then accounts for the original skb once more, leaving its qlen one larger than the number of packets actually queued. With QFQ as the parent, after all real packets are dequeued, QFQ still has a non-zero qlen while its in-service aggregate has no active classes. qfq_choose_next_agg() returns NULL and qfq_dequeue() passes the result to qfq_peek_skb(), causing a NULL pointer dereference. Follow the same pattern used by tbf_segment() and taprio: count only successfully queued segments, propagate the difference between the original skb and those segments, and return NET_XMIT_SUCCESS whenever at least one segment was queued.
Quoted source text, attributed separately from HOL analysis.