138 lines
8.1 KiB
JSON
138 lines
8.1 KiB
JSON
{
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"dataType": "CVE_RECORD",
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"dataVersion": "5.2",
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"cveMetadata": {
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"cveId": "CVE-2026-98305",
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"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"state": "PUBLISHED",
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"assignerShortName": "Linux",
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"dateReserved": "2026-09-25T10:25:14.338Z",
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"datePublished": "2026-10-06T08:46:02.190Z",
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"dateUpdated": "2026-10-19T09:17:16.045Z"
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},
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"containers": {
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"cna": {
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"providerMetadata": {
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"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"shortName": "Linux",
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"dateUpdated": "2026-10-19T09:17:16.045Z"
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},
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"descriptions": [
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{
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"lang": "en",
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: dsa: mxl862xx: disable the stats poll on teardown\n\nmxl862xx_setup() arms the stats poll before mxl862xx_setup_mdio(), and\nnothing stops it until dsa_register_switch() has returned an error to\nmxl862xx_probe(). DSA frees the dsa_port list before it returns, so a\npoll that fires once .setup or a later step of dsa_tree_setup() has\nfailed walks freed ports. On shutdown the user ports stay registered,\nand the WORK_STOPPED flag test in mxl862xx_get_stats64() is not atomic\nwith the cancel in mxl862xx_shutdown(), so a re-arm that read the flag\nbefore it was set queues the poll after cancel_delayed_work_sync() has\nreturned.\n\nArm the poll once .setup has succeeded and stop it from a .teardown op,\nwhich DSA calls on unregister and after a failed registration, in both\ncases before it frees the ports. Use disable_delayed_work_sync() there\nand in shutdown(): it drains a running poll as the cancel did and turns\nevery later attempt to queue the work into a no-op, so the re-arm\ncannot bring the poll back. remove() and the probe error path only set\nWORK_STOPPED, which crc_err_work tests before it walks the ports."
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}
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],
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"metrics": [
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{
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"cvssV3_1": {
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"version": "3.1",
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"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
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"baseScore": 7.8,
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"baseSeverity": "HIGH"
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},
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"scenarios": [
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{
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"lang": "en",
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"value": "AV:L - The racing input is local: reading /proc/net/dev or RTM_GETLINK calls dsa_user_get_stats64() -> mxl862xx_get_stats64(), which re-queues priv->stats_work. No packet from a remote peer feeds the bug; it is a teardown-ordering error in mxl862xx_setup()/remove()/shutdown().\nAC:L - placeholder\nPR:L - Any unprivileged local user can read interface statistics on the switch's user ports, and that read is the attacker's side of the race (the schedule_delayed_work() call in mxl862xx_get_stats64()). No capability check stands in the way.\nUI:N - No victim action such as opening a file or mounting media is needed. The attacker's part is only repeated stats reads; the teardown event is covered under AC.\nS:U - The freed dsa_port objects and the devm-freed mxl862xx_priv are kernel memory, and the impact stays within the kernel's own security authority.\nC:H - mxl862xx_stats_work_fn() walks the ds->ports list after dsa_switch_release_ports() has run kfree(dp). It reads dp->index from freed memory and writes counters into priv->ports[].stats. A use-after-free like this can be turned into a memory read primitive.\nI:H - On remove, a re-armed stats_work sits inside the devm-freed mxl862xx_priv. When its timer fires, the workqueue uses the work_struct and its func pointer from memory that may have been reallocated, which allows control-flow hijack. The stats poll also writes into freed memory.\nA:H - Walking freed dsa_port entries or running a work item from freed priv memory causes a kernel oops or panic. In the shutdown case, the poll keeps reaching the switch after mxl862xx_host_shutdown(), which can also crash the system during reboot."
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}
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]
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}
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],
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"affected": [
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "unaffected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"drivers/net/dsa/mxl862xx/mxl862xx.c"
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],
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"versions": [
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{
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"version": "a21d33a5265f0b31d935a8b9b2b6faefb5185911",
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"lessThan": "97df811a11d4f76bc2ffe67b6bf730263f56c668",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "a21d33a5265f0b31d935a8b9b2b6faefb5185911",
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"lessThan": "9e92ad4630f5dd1838ce6bbe6b1bd2c73d34de36",
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"status": "affected",
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"versionType": "git"
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}
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]
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},
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "affected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"drivers/net/dsa/mxl862xx/mxl862xx.c"
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],
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"versions": [
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{
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"version": "7.1",
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"status": "affected"
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},
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{
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"version": "0",
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"lessThan": "7.1",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "7.2.8",
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"lessThanOrEqual": "7.2.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "7.3",
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"lessThanOrEqual": "*",
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"status": "unaffected",
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"versionType": "original_commit_for_fix"
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}
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]
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}
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],
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"cpeApplicability": [
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{
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"nodes": [
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{
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"operator": "OR",
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"negate": false,
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"cpeMatch": [
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "7.1",
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"versionEndExcluding": "7.2.8"
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},
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "7.1",
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"versionEndExcluding": "7.3"
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}
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]
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}
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]
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}
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],
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"references": [
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{
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"url": "https://git.kernel.org/stable/c/97df811a11d4f76bc2ffe67b6bf730263f56c668"
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},
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{
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"url": "https://git.kernel.org/stable/c/9e92ad4630f5dd1838ce6bbe6b1bd2c73d34de36"
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}
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],
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"title": "net: dsa: mxl862xx: disable the stats poll on teardown",
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"x_generator": {
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"engine": "bippy-1.2.0"
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}
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