{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-64121", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-07-19T07:54:57.036Z", "datePublished": "2026-07-19T15:40:19.745Z", "dateUpdated": "2026-07-19T15:40:19.745Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-07-19T15:40:19.745Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: ifb: report ethtool stats over num_tx_queues\n\nifb_dev_init() allocates dp->tx_private to dev->num_tx_queues\nentries via kzalloc_objs(*txp, dev->num_tx_queues). Both IFB\nper-queue RX and TX stats live in those entries: ifb_xmit() updates\ntxp->rx_stats using the skb queue mapping, ifb_ri_tasklet() updates\ntxp->tx_stats, and ifb_stats64() aggregates both over\ndev->num_tx_queues.\n\nThe ethtool stats callbacks instead size and walk the per-queue\nstats with dev->real_num_rx_queues and dev->real_num_tx_queues. With\nan asymmetric device where the RX queue count exceeds the TX queue\ncount, for example:\n\n ip link add name ifb10 numtxqueues 1 numrxqueues 8 type ifb\n ethtool -S ifb10\n\nifb_get_ethtool_stats() indexes past the tx_private allocation and\ncopies adjacent slab data through ETHTOOL_GSTATS.\n\nUse dev->num_tx_queues consistently for the stats strings, the\nstats count, and the stats data walks. This reports one RX stats\ngroup and one TX stats group for each backing ifb_q_private entry,\nwhich is the queue set IFB can actually populate.\n\nReproduced under UML+KASAN at v7.1-rc2:\n\n BUG: KASAN: slab-out-of-bounds in ifb_fill_stats_data+0x3c/0xae\n Read of size 8 at addr 0000000062dbd228 by task ethtool/36\n ifb_fill_stats_data+0x3c/0xae\n ifb_get_ethtool_stats+0xc0/0x129\n __dev_ethtool+0x1ca5/0x363c\n dev_ethtool+0x123/0x1b3\n dev_ioctl+0x56c/0x744\n sock_do_ioctl+0x15f/0x1b2\n sock_ioctl+0x4d5/0x50a\n sys_ioctl+0xd8b/0xde9\n\nWith the patch applied, the same UML+KASAN repro is silent and\nethtool -S ifb10 reports only the stats backed by the single\nallocated tx_private entry."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/net/ifb.c"], "versions": [{"version": "a21ee5b2fcb8d6d3973446c5039e966c4cfe40d1", "lessThan": "6afdb8113cb007f9332f59a9b7fd45731b8a9de5", "status": "affected", "versionType": "git"}, {"version": "a21ee5b2fcb8d6d3973446c5039e966c4cfe40d1", "lessThan": "16bd798cb6d8337d7c3eea1adc412f31b5181d5b", "status": "affected", "versionType": "git"}, {"version": "a21ee5b2fcb8d6d3973446c5039e966c4cfe40d1", "lessThan": "301a554e458e2f5ec47f2c336a7cb03b877f9fd6", "status": "affected", "versionType": "git"}, {"version": "a21ee5b2fcb8d6d3973446c5039e966c4cfe40d1", "lessThan": "f8a5a76b4a683043c6eff2a060bcaa17f9316ad5", "status": "affected", "versionType": "git"}, {"version": "a21ee5b2fcb8d6d3973446c5039e966c4cfe40d1", "lessThan": "2638e1773904d7aa8f24c6e7fda2ed7d69df6fa4", "status": "affected", "versionType": "git"}, {"version": "a21ee5b2fcb8d6d3973446c5039e966c4cfe40d1", "lessThan": "5db89c99566fc4728cc92e941d8e1975711e24b5", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/net/ifb.c"], "versions": [{"version": "5.17", "status": "affected"}, {"version": "0", "lessThan": "5.17", "status": "unaffected", "versionType": "semver"}, {"version": "6.1.175", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.142", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.92", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.34", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.0.11", "lessThanOrEqual": "7.0.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.1", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix"}]}], "cpeApplicability": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.17", "versionEndExcluding": "6.1.175"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.17", "versionEndExcluding": "6.6.142"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.17", "versionEndExcluding": "6.12.92"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.17", "versionEndExcluding": "6.18.34"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.17", "versionEndExcluding": "7.0.11"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.17", "versionEndExcluding": "7.1"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/6afdb8113cb007f9332f59a9b7fd45731b8a9de5"}, {"url": "https://git.kernel.org/stable/c/16bd798cb6d8337d7c3eea1adc412f31b5181d5b"}, {"url": "https://git.kernel.org/stable/c/301a554e458e2f5ec47f2c336a7cb03b877f9fd6"}, {"url": "https://git.kernel.org/stable/c/f8a5a76b4a683043c6eff2a060bcaa17f9316ad5"}, {"url": "https://git.kernel.org/stable/c/2638e1773904d7aa8f24c6e7fda2ed7d69df6fa4"}, {"url": "https://git.kernel.org/stable/c/5db89c99566fc4728cc92e941d8e1975711e24b5"}], "title": "net: ifb: report ethtool stats over num_tx_queues", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

{}

{"bugzilla": {"description": "kernel: net: ifb: report ethtool stats over num_tx_queues", "id": "2502532", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2502532"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.5", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-125", "details": ["A flaw was found in the Linux kernel's Intermediate Functional Block (ifb) network device. A local user with network configuration privileges can trigger a slab-out-of-bounds read by configuring an asymmetric ifb device and querying its ethtool statistics. This vulnerability can lead to a kernel crash, resulting in a denial of service, and potentially disclose sensitive information by reading adjacent memory data."], "name": "CVE-2026-64121", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/a:redhat:hummingbird:1", "fix_state": "Not affected", "impact": "important", "package_name": "erlang27", "product_name": "Red Hat Hardened Images"}], "public_date": "2026-07-19T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-64121\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-64121\nhttps://lore.kernel.org/linux-cve-announce/2026071924-CVE-2026-64121-7da8@gregkh/T"], "threat_severity": "Moderate"}

{}