478 lines
24 KiB
JSON
478 lines
24 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-2025-21682",
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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": "2024-12-29T08:45:45.739Z",
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"datePublished": "2025-01-31T11:25:42.160Z",
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"dateUpdated": "2026-11-10T12:34:37.101Z"
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},
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"cna": {
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"shortName": "Linux",
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"dateUpdated": "2026-08-05T11:53:36.562Z"
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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\neth: bnxt: always recalculate features after XDP clearing, fix null-deref\n\nRecalculate features when XDP is detached.\n\nBefore:\n # ip li set dev eth0 xdp obj xdp_dummy.bpf.o sec xdp\n # ip li set dev eth0 xdp off\n # ethtool -k eth0 | grep gro\n rx-gro-hw: off [requested on]\n\nAfter:\n # ip li set dev eth0 xdp obj xdp_dummy.bpf.o sec xdp\n # ip li set dev eth0 xdp off\n # ethtool -k eth0 | grep gro\n rx-gro-hw: on\n\nThe fact that HW-GRO doesn't get re-enabled automatically is just\na minor annoyance. The real issue is that the features will randomly\ncome back during another reconfiguration which just happens to invoke\nnetdev_update_features(). The driver doesn't handle reconfiguring\ntwo things at a time very robustly.\n\nStarting with commit 98ba1d931f61 (\"bnxt_en: Fix RSS logic in\n__bnxt_reserve_rings()\") we only reconfigure the RSS hash table\nif the \"effective\" number of Rx rings has changed. If HW-GRO is\nenabled \"effective\" number of rings is 2x what user sees.\nSo if we are in the bad state, with HW-GRO re-enablement \"pending\"\nafter XDP off, and we lower the rings by / 2 - the HW-GRO rings\ndoing 2x and the ethtool -L doing / 2 may cancel each other out,\nand the:\n\n if (old_rx_rings != bp->hw_resc.resv_rx_rings &&\n\ncondition in __bnxt_reserve_rings() will be false.\nThe RSS map won't get updated, and we'll crash with:\n\n BUG: kernel NULL pointer dereference, address: 0000000000000168\n RIP: 0010:__bnxt_hwrm_vnic_set_rss+0x13a/0x1a0\n bnxt_hwrm_vnic_rss_cfg_p5+0x47/0x180\n __bnxt_setup_vnic_p5+0x58/0x110\n bnxt_init_nic+0xb72/0xf50\n __bnxt_open_nic+0x40d/0xab0\n bnxt_open_nic+0x2b/0x60\n ethtool_set_channels+0x18c/0x1d0\n\nAs we try to access a freed ring.\n\nThe issue is present since XDP support was added, really, but\nprior to commit 98ba1d931f61 (\"bnxt_en: Fix RSS logic in\n__bnxt_reserve_rings()\") it wasn't causing major issues."
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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:L/A:H",
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"baseScore": 7.3,
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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 bug is reached only through local device-configuration interfaces — RTM_SETLINK for XDP attach/detach and the ethtool set_channels ioctl/netlink call on a bnxt netdev. No remote peer input reaches this code.\nAC:L - The commit gives a deterministic recipe: attach XDP, detach XDP, then halve the ring count so the pending HW-GRO 2x cancels the /2 and the RSS map refresh is skipped. Every input is attacker-chosen, there is no race and no memory-layout condition outside the attacker's influence.\nPR:L - Both entry points check ns_capable(net->user_ns, CAP_NET_ADMIN), which is namespace-scoped rather than requiring real root in the init namespace, so a container or namespace-confined user holding a delegated bnxt netdev (such as an SR-IOV VF) can drive the full sequence.\nUI:N - The attacker performs the XDP attach, XDP detach and channel-count change entirely on its own; no other user or administrator action is needed at any point.\nS:U - The out-of-bounds access and resulting crash are confined to the kernel's own memory and the driver's hardware configuration, within the same security authority; no VM, IOMMU or sandbox boundary is crossed.\nC:H - bnxt_fill_hw_rss_tbl_p5() indexes bp->rx_ring with stale RSS indices past the end of the newly kcalloc'd array, reading adjacent heap objects and then dereferencing an rx_cpr pointer taken from that out-of-bounds memory, which with heap grooming becomes an attacker-influenced arbitrary-address read.\nI:L - There is no out-of-bounds write, but garbage ring IDs harvested from the out-of-bounds read are programmed into the NIC's RSS indirection table, corrupting hardware receive steering — a bounded but real modification of state.\nA:H - The dereference of the NULL/wild rx_cpr pointer oopses inside __bnxt_open_nic() while holding rtnl_lock, taking down the network device and typically panicking or wedging the machine."
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}
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]
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}
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],
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"drivers/net/ethernet/broadcom/bnxt/bnxt.c",
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"drivers/net/ethernet/broadcom/bnxt/bnxt.h",
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"drivers/net/ethernet/broadcom/bnxt/bnxt_xdp.c"
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"drivers/net/ethernet/broadcom/bnxt/bnxt.h",
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"drivers/net/ethernet/broadcom/bnxt/bnxt_xdp.c"
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],
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}
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"id": "CVE-2025-21682",
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"role": "CISA Coordinator",
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"version": "2.0.3",
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"timestamp": "2025-10-01T19:51:50.706963Z"
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}
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"lang": "en",
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"type": "CWE",
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"cweId": "CWE-476",
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"description": "CWE-476 NULL Pointer Dereference"
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}
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]
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}
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],
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"title": "CISA ADP Vulnrichment",
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},
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|
|
],
|
|
"defaultStatus": "unknown"
|
|
},
|
|
{
|
|
"vendor": "Siemens",
|
|
"product": "SIPLUS S7-1500 CPU 1518-4 PN/DP MFP (6AG1518-4AX00-4AC0)",
|
|
"versions": [
|
|
{
|
|
"status": "affected",
|
|
"version": "V3.1.7",
|
|
"lessThan": "*",
|
|
"versionType": "custom"
|
|
}
|
|
],
|
|
"defaultStatus": "unknown"
|
|
}
|
|
],
|
|
"references": [
|
|
{
|
|
"url": "https://cert-portal.siemens.com/productcert/html/ssa-082556.html"
|
|
},
|
|
{
|
|
"url": "https://cert-portal.siemens.com/productcert/html/ssa-019113.html"
|
|
},
|
|
{
|
|
"url": "https://cert-portal.siemens.com/productcert/html/ssa-457936.html"
|
|
},
|
|
{
|
|
"url": "https://cert-portal.siemens.com/productcert/html/ssa-784472.html"
|
|
}
|
|
]
|
|
}
|
|
]
|
|
}
|
|
} |