Answer in brief
CVE-2021-47013 records a Critical severity (CVSS 9.8) vulnerability in net:emac/emac-mac: Fix a use after free in emac_mac_tx_buf_send. 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.
Answer in brief
CVE-2021-47013 records a Critical severity (CVSS 9.8) vulnerability in net:emac/emac-mac: Fix a use after free in emac_mac_tx_buf_send. 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 9.8. 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 | >=b9b17debc69d27cd55e21ee51a5ba7fc50a426cf <c7f75d11fe72913d2619f97b2334b083cd7bb955 || >=b9b17debc69d27cd55e21ee51a5ba7fc50a426cf <dc1b438a35773d030be0ee80d9c635c3e558a322 || >=b9b17debc69d27cd55e21ee51a5ba7fc50a426cf <16d8c44be52e3650917736d45f5904384a9da834 || >=b9b17debc69d27cd55e21ee51a5ba7fc50a426cf <55fcdd1258faaecca74b91b88cc0921f9edd775d || >=b9b17debc69d27cd55e21ee51a5ba7fc50a426cf <9dc373f74097edd0e35f3393d6248eda8d1ba99d || >=b9b17debc69d27cd55e21ee51a5ba7fc50a426cf <8c06f34785068b87e2b560534c77c163d6c6dca7 || >=b9b17debc69d27cd55e21ee51a5ba7fc50a426cf <e407495ba6788a67d1bd41714158c079e340879b || >=b9b17debc69d27cd55e21ee51a5ba7fc50a426cf <6d72e7c767acbbdd44ebc7d89c6690b405b32b57 | c7f75d11fe72913d2619f97b2334b083cd7bb955, dc1b438a35773d030be0ee80d9c635c3e558a322, 16d8c44be52e3650917736d45f5904384a9da834, 55fcdd1258faaecca74b91b88cc0921f9edd775d, 9dc373f74097edd0e35f3393d6248eda8d1ba99d, 8c06f34785068b87e2b560534c77c163d6c6dca7, e407495ba6788a67d1bd41714158c079e340879b, 6d72e7c767acbbdd44ebc7d89c6690b405b32b57 |
| Linux/Linuxgeneric | 4.9 | Not reported |
Published upstream
Feb 28, 2024
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 5, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 4, 2026
In the Linux kernel, the following vulnerability has been resolved: net:emac/emac-mac: Fix a use after free in emac_mac_tx_buf_send In emac_mac_tx_buf_send, it calls emac_tx_fill_tpd(..,skb,..). If some error happens in emac_tx_fill_tpd(), the skb will be freed via dev_kfree_skb(skb) in error branch of emac_tx_fill_tpd(). But the freed skb is still used via skb->len by netdev_sent_queue(,skb->len). As i observed that emac_tx_fill_tpd() haven't modified the value of skb->len, thus my patch assigns skb->len to 'len' before the possible free and use 'len' instead of skb->len later.
Quoted source text, attributed separately from HOL analysis.
CVSS is 9.8. 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 | >=b9b17debc69d27cd55e21ee51a5ba7fc50a426cf <c7f75d11fe72913d2619f97b2334b083cd7bb955 || >=b9b17debc69d27cd55e21ee51a5ba7fc50a426cf <dc1b438a35773d030be0ee80d9c635c3e558a322 || >=b9b17debc69d27cd55e21ee51a5ba7fc50a426cf <16d8c44be52e3650917736d45f5904384a9da834 || >=b9b17debc69d27cd55e21ee51a5ba7fc50a426cf <55fcdd1258faaecca74b91b88cc0921f9edd775d || >=b9b17debc69d27cd55e21ee51a5ba7fc50a426cf <9dc373f74097edd0e35f3393d6248eda8d1ba99d || >=b9b17debc69d27cd55e21ee51a5ba7fc50a426cf <8c06f34785068b87e2b560534c77c163d6c6dca7 || >=b9b17debc69d27cd55e21ee51a5ba7fc50a426cf <e407495ba6788a67d1bd41714158c079e340879b || >=b9b17debc69d27cd55e21ee51a5ba7fc50a426cf <6d72e7c767acbbdd44ebc7d89c6690b405b32b57 | c7f75d11fe72913d2619f97b2334b083cd7bb955, dc1b438a35773d030be0ee80d9c635c3e558a322, 16d8c44be52e3650917736d45f5904384a9da834, 55fcdd1258faaecca74b91b88cc0921f9edd775d, 9dc373f74097edd0e35f3393d6248eda8d1ba99d, 8c06f34785068b87e2b560534c77c163d6c6dca7, e407495ba6788a67d1bd41714158c079e340879b, 6d72e7c767acbbdd44ebc7d89c6690b405b32b57 |
| Linux/Linuxgeneric | 4.9 | Not reported |
Published upstream
Feb 28, 2024
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 5, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 4, 2026
In the Linux kernel, the following vulnerability has been resolved: net:emac/emac-mac: Fix a use after free in emac_mac_tx_buf_send In emac_mac_tx_buf_send, it calls emac_tx_fill_tpd(..,skb,..). If some error happens in emac_tx_fill_tpd(), the skb will be freed via dev_kfree_skb(skb) in error branch of emac_tx_fill_tpd(). But the freed skb is still used via skb->len by netdev_sent_queue(,skb->len). As i observed that emac_tx_fill_tpd() haven't modified the value of skb->len, thus my patch assigns skb->len to 'len' before the possible free and use 'len' instead of skb->len later.
Quoted source text, attributed separately from HOL analysis.