net: ifb: report ethtool stats over num_tx_queues

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Summary

CVECVE-2026-64121
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-07-19 16:17:53 UTC
Updated2026-07-19 16:17:53 UTC
DescriptionIn 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.

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected a21ee5b2fcb8d6d3973446c5039e966c4cfe40d1 6afdb8113cb007f9332f59a9b7fd45731b8a9de5 git Not specified
CNA Linux Linux affected a21ee5b2fcb8d6d3973446c5039e966c4cfe40d1 16bd798cb6d8337d7c3eea1adc412f31b5181d5b git Not specified
CNA Linux Linux affected a21ee5b2fcb8d6d3973446c5039e966c4cfe40d1 301a554e458e2f5ec47f2c336a7cb03b877f9fd6 git Not specified
CNA Linux Linux affected a21ee5b2fcb8d6d3973446c5039e966c4cfe40d1 f8a5a76b4a683043c6eff2a060bcaa17f9316ad5 git Not specified
CNA Linux Linux affected a21ee5b2fcb8d6d3973446c5039e966c4cfe40d1 2638e1773904d7aa8f24c6e7fda2ed7d69df6fa4 git Not specified
CNA Linux Linux affected a21ee5b2fcb8d6d3973446c5039e966c4cfe40d1 5db89c99566fc4728cc92e941d8e1975711e24b5 git Not specified
CNA Linux Linux affected 5.17 Not specified
CNA Linux Linux unaffected 5.17 semver Not specified
CNA Linux Linux unaffected 6.1.175 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.142 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.92 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.34 6.18.* semver Not specified
CNA Linux Linux unaffected 7.0.11 7.0.* semver Not specified
CNA Linux Linux unaffected 7.1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/5db89c99566fc4728cc92e941d8e1975711e24b5 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/f8a5a76b4a683043c6eff2a060bcaa17f9316ad5 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/16bd798cb6d8337d7c3eea1adc412f31b5181d5b 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/2638e1773904d7aa8f24c6e7fda2ed7d69df6fa4 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/301a554e458e2f5ec47f2c336a7cb03b877f9fd6 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/6afdb8113cb007f9332f59a9b7fd45731b8a9de5 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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