Answer in brief
CVE-2026-64121 records a High severity (CVSS 7.1) vulnerability in net: ifb: report ethtool stats over num_tx_queues. 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 7.1. 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 |
| cpe:2.3:o:linux:linux_kernel:7.1:rc1:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:o:linux:linux_kernel:7.1:rc2:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:o:linux:linux_kernel:7.1:rc3:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:o:linux:linux_kernel:7.1:rc4:*:*:*:*:*:* | Not reported | Not reported |
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=a21ee5b2fcb8d6d3973446c5039e966c4cfe40d1 <6afdb8113cb007f9332f59a9b7fd45731b8a9de5 || >=a21ee5b2fcb8d6d3973446c5039e966c4cfe40d1 <16bd798cb6d8337d7c3eea1adc412f31b5181d5b || >=a21ee5b2fcb8d6d3973446c5039e966c4cfe40d1 <301a554e458e2f5ec47f2c336a7cb03b877f9fd6 || >=a21ee5b2fcb8d6d3973446c5039e966c4cfe40d1 <f8a5a76b4a683043c6eff2a060bcaa17f9316ad5 || >=a21ee5b2fcb8d6d3973446c5039e966c4cfe40d1 <2638e1773904d7aa8f24c6e7fda2ed7d69df6fa4 || >=a21ee5b2fcb8d6d3973446c5039e966c4cfe40d1 <5db89c99566fc4728cc92e941d8e1975711e24b5 | 6afdb8113cb007f9332f59a9b7fd45731b8a9de5, 16bd798cb6d8337d7c3eea1adc412f31b5181d5b, 301a554e458e2f5ec47f2c336a7cb03b877f9fd6, f8a5a76b4a683043c6eff2a060bcaa17f9316ad5, 2638e1773904d7aa8f24c6e7fda2ed7d69df6fa4, 5db89c99566fc4728cc92e941d8e1975711e24b5 |
| Linux/Linuxgeneric | 5.17 | Not reported |
Published upstream
Jul 19, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Nov 6, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 14, 2026
In the Linux kernel, the following vulnerability has been resolved: net: ifb: report ethtool stats over num_tx_queues ifb_dev_init() allocates dp->tx_private to dev->num_tx_queues entries via kzalloc_objs(*txp, dev->num_tx_queues). Both IFB per-queue RX and TX stats live in those entries: ifb_xmit() updates txp->rx_stats using the skb queue mapping, ifb_ri_tasklet() updates txp->tx_stats, and ifb_stats64() aggregates both over dev->num_tx_queues. The ethtool stats callbacks instead size and walk the per-queue stats with dev->real_num_rx_queues and dev->real_num_tx_queues. With an asymmetric device where the RX queue count exceeds the TX queue count, for example: ip link add name ifb10 numtxqueues 1 numrxqueues 8 type ifb ethtool -S ifb10 ifb_get_ethtool_stats() indexes past the tx_private allocation and copies adjacent slab data through ETHTOOL_GSTATS. Use dev->num_tx_queues consistently for the stats strings, the stats count, and the stats data walks. This reports one RX stats group and one TX stats group for each backing ifb_q_private entry, which is the queue set IFB can actually populate. Reproduced under UML+KASAN at v7.1-rc2: BUG: KASAN: slab-out-of-bounds in ifb_fill_stats_data+0x3c/0xae Read of size 8 at addr 0000000062dbd228 by task ethtool/36 ifb_fill_stats_data+0x3c/0xae ifb_get_ethtool_stats+0xc0/0x129 __dev_ethtool+0x1ca5/0x363c dev_ethtool+0x123/0x1b3 dev_ioctl+0x56c/0x744 sock_do_ioctl+0x15f/0x1b2 sock_ioctl+0x4d5/0x50a sys_ioctl+0xd8b/0xde9 With the patch applied, the same UML+KASAN repro is silent and ethtool -S ifb10 reports only the stats backed by the single allocated tx_private entry.
Quoted source text, attributed separately from HOL analysis.