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vuln-cve/data/2026/98xxx/CVE-2026-98022.json
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{
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"cveMetadata": {
"cveId": "CVE-2026-98022",
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"state": "PUBLISHED",
"assignerShortName": "Linux",
"dateReserved": "2026-09-25T10:19:56.069Z",
"datePublished": "2026-09-25T10:23:42.116Z",
"dateUpdated": "2026-10-19T09:12:27.416Z"
},
"containers": {
"cna": {
"providerMetadata": {
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux",
"dateUpdated": "2026-10-19T09:12:27.416Z"
},
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: cap tx_queue_len at S16_MAX to prevent oversized ring allocations\n\nSeveral subsystems allocate ring buffers sized by dev->tx_queue_len\nwith no upper bound. An unprivileged user (via unshare -Urn) can set a\nhuge tx_queue_len and exhaust global memory with ring allocations:\n\n- pfifo_fast: pfifo_fast_init() and pfifo_fast_change_tx_queue_len()\n allocate 3 skb_array rings of tx_queue_len entries each.\n- tun: tun_queue_resize() and the queue-attach path resize ptr_rings\n to tx_queue_len on the NETDEV_CHANGE_TX_QUEUE_LEN notifier.\n- tap (macvtap/ipvtap): tap_queue_resize() and tap_init() resize/init\n ptr_rings to tx_queue_len on the same notifier.\n\nnetif_change_tx_queue_len() is the single entry point for IFLA_TXQLEN,\nsysfs, and the SIOCSIFTXQLEN ioctl. Cap new_len at S16_MAX (32767)\nthere so the oversized value is rejected at set time. This takes\neffect whether the device is up or down, before dev->tx_queue_len is\nwritten, before any notifier fires, and before any ring is allocated.\nThe \"> S16_MAX\" check also subsumes the previous unsigned-long\ntruncation test, and a negative ifr_qlen from the ioctl lands far\nabove the cap after conversion, so both old failure modes are covered\nby the one comparison.\n\ntx_queue_len is ambigious: both a per-ring sizing multiplier and a\ndefault queue-length/limit knob for consumers that allocate\nnothing at set time (pfifo/bfifo/gred/plug/sfb limits, htb\ndirect_qlen, qfq max_classes, teql). 32767 is chosen as the largest\nvalue NLA_POLICY_FULL_RANGE can express for the u32 IFLA_TXQLEN\npolicy in patch 2/3 while staying a legitimate queue length on\nhigh-BDP paths; the ring-memory trade-off of a shared knob is\ndisclosed below.\n\nConditions to recreate the bug:\n- CONFIG_NET_SCHED=y, CONFIG_VETH=y, CONFIG_USER_NS=y, CONFIG_NET_NS=y.\n- Unprivileged user in a fresh user+net namespace (unshare -Urn).\n- pfifo_fast: create veth pairs, set tx_queue_len to 500000, attach\n mq+pfifo_fast. ~28 iterations OOMs a 2GB guest.\n- tun: create 50 tun devices with IFF_MULTI_QUEUE, set tx_queue_len to\n 500000, open 8 queues each. ~1.6GB of ptr_ring allocations OOMs a\n 512MB guest.\n- tap: same as tun with IFF_TAP. ~960MB OOMs a 512MB guest.\n- On the fixed kernel the oversized tx_queue_len is rejected with\n -ERANGE at set time (all four paths: RTM_SETLINK, RTM_NEWLINK\n create, sysfs, ioctl - the latter two via this check, the former\n two via this check and the 2/3 parse policy respectively)."
}
],
"affected": [
{
"product": "Linux",
"vendor": "Linux",
"defaultStatus": "unaffected",
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"programFiles": [
"net/core/dev.c"
],
"versions": [
{
"version": "6a643ddb5624be7e0694d49f5765a8d41c1ab6d0",
"lessThan": "24d02c909a1725ab9eceb92db7d02e4e841f17ca",
"status": "affected",
"versionType": "git"
},
{
"version": "6a643ddb5624be7e0694d49f5765a8d41c1ab6d0",
"lessThan": "5e5591a0f33f7c11bf1d338dbb6c5072575de64c",
"status": "affected",
"versionType": "git"
},
{
"version": "6a643ddb5624be7e0694d49f5765a8d41c1ab6d0",
"lessThan": "c8d4060610c69645733c92d94fceb4b93808ac4d",
"status": "affected",
"versionType": "git"
},
{
"version": "6a643ddb5624be7e0694d49f5765a8d41c1ab6d0",
"lessThan": "c2362c500931e5bd1826bce34e9ce28af80e7541",
"status": "affected",
"versionType": "git"
},
{
"version": "6a643ddb5624be7e0694d49f5765a8d41c1ab6d0",
"lessThan": "81c0e02076989743a603806a5a4f44d2c40dc01f",
"status": "affected",
"versionType": "git"
},
{
"version": "6a643ddb5624be7e0694d49f5765a8d41c1ab6d0",
"lessThan": "081340cf70a789b94b4174af54a63ffd49677a4e",
"status": "affected",
"versionType": "git"
},
{
"version": "6a643ddb5624be7e0694d49f5765a8d41c1ab6d0",
"lessThan": "a03b927bae4af5c23fd5315a237855c17cc8f422",
"status": "affected",
"versionType": "git"
},
{
"version": "6a643ddb5624be7e0694d49f5765a8d41c1ab6d0",
"lessThan": "66ab4c59b74db7ab53a1c9083feaaede393a96a0",
"status": "affected",
"versionType": "git"
}
]
},
{
"product": "Linux",
"vendor": "Linux",
"defaultStatus": "affected",
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"programFiles": [
"net/core/dev.c"
],
"versions": [
{
"version": "4.16",
"status": "affected"
},
{
"version": "0",
"lessThan": "4.16",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "5.10.271",
"lessThanOrEqual": "5.10.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "5.15.222",
"lessThanOrEqual": "5.15.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "6.1.189",
"lessThanOrEqual": "6.1.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "6.6.158",
"lessThanOrEqual": "6.6.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "6.12.111",
"lessThanOrEqual": "6.12.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "6.18.53",
"lessThanOrEqual": "6.18.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "7.2.7",
"lessThanOrEqual": "7.2.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "7.3",
"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": "4.16",
"versionEndExcluding": "5.10.271"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "4.16",
"versionEndExcluding": "5.15.222"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "4.16",
"versionEndExcluding": "6.1.189"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "4.16",
"versionEndExcluding": "6.6.158"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "4.16",
"versionEndExcluding": "6.12.111"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "4.16",
"versionEndExcluding": "6.18.53"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "4.16",
"versionEndExcluding": "7.2.7"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "4.16",
"versionEndExcluding": "7.3"
}
]
}
]
}
],
"references": [
{
"url": "https://git.kernel.org/stable/c/24d02c909a1725ab9eceb92db7d02e4e841f17ca"
},
{
"url": "https://git.kernel.org/stable/c/5e5591a0f33f7c11bf1d338dbb6c5072575de64c"
},
{
"url": "https://git.kernel.org/stable/c/c8d4060610c69645733c92d94fceb4b93808ac4d"
},
{
"url": "https://git.kernel.org/stable/c/c2362c500931e5bd1826bce34e9ce28af80e7541"
},
{
"url": "https://git.kernel.org/stable/c/81c0e02076989743a603806a5a4f44d2c40dc01f"
},
{
"url": "https://git.kernel.org/stable/c/081340cf70a789b94b4174af54a63ffd49677a4e"
},
{
"url": "https://git.kernel.org/stable/c/a03b927bae4af5c23fd5315a237855c17cc8f422"
},
{
"url": "https://git.kernel.org/stable/c/66ab4c59b74db7ab53a1c9083feaaede393a96a0"
}
],
"title": "net: cap tx_queue_len at S16_MAX to prevent oversized ring allocations",
"x_generator": {
"engine": "bippy-1.2.0"
}
}
}
}
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