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              "value": "AV:L - The bug is reached only through local ethtool interfaces on the mlx5 netdev \u2014 the ETHTOOL_MSG_MODULE_EEPROM_GET genetlink message or the ETHTOOL_GMODULEEEPROM ioctl on a socket. No remote peer or received packet can trigger it.\nAC:L - A single ethtool module-EEPROM read of 128 bytes deterministically triggers the over-read on any adapter whose firmware advertises mcia_32dwords, which is the normal case on modern ConnectX hardware with a transceiver installed. No race, no memory-layout grooming, fully repeatable.\nPR:L - Both entry points check ns_capable(net-\u003euser_ns, CAP_NET_ADMIN), which is namespace-relative, so the root of an unprivileged user namespace owning a netns that holds an mlx5 VF/subfunction netdev (a standard SR-IOV container setup) can trigger it without any privilege in the initial namespace.\nUI:N - The attacker triggers the read entirely on their own by issuing an ethtool query; no action by another user or administrator is needed.\nS:U - The out-of-bounds read and its consequences are confined to the kernel of the same host; no VM, IOMMU, or other security-authority boundary is crossed.\nC:H - Up to 80 bytes of kernel stack adjacent to the 64-byte \u0027out\u0027 buffer are memcpy()\u0027d into the EEPROM data returned to userspace, disclosing saved registers, pointers and potentially return addresses or the stack canary \u2014 enough to defeat KASLR and stack protection and aid further exploitation.\nI:N - The defect is purely a read overflow; the destination buffer is sized from the caller\u0027s own request length, so no kernel memory is written out of bounds and no data is modified.\nA:H - On the widely enabled CONFIG_FORTIFY_SOURCE the copy hits fortify_panic(), producing a kernel BUG/oops in mlx5_query_mcia() while rtnl/netdev locks are held (per the reported trace), wedging networking and panicking outright with panic_on_oops."
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          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nopenvswitch: Fix CT limit teardown use-after-free\n\nPacket processing uses CT limit state under RCU, while netns teardown\nfrees that state under ovs_mutex. The CT limit pointer was neither removed\nfrom readers nor protected by a grace period, allowing packet processing to\ndereference the freed state.\n\nAn unprivileged user can trigger this bug from a user and network\nnamespace, causing a slab-use-after-free in ovs_ct_execute() when the\nnetns is torn down.\n\nPublish the CT limit pointer through RCU, remove it before teardown, and\nwait for readers before freeing its contents. Keep ovs_mutex around\nindividual CT limit updates, and use the RCU read-side lock while GET\ntraverses the RCU-protected limit lists.\n\nNetns teardown detaches the RCU-protected CT limit state in the pernet\n.pre_exit callback while holding ovs_mutex.  The pernet core guarantees an\nRCU grace period between the .pre_exit and .exit callbacks, so the .exit\ncallback completes the teardown without adding any extra synchronization.\n\nThe netlink command handlers do not need NULL checks because the userspace\nnetlink socket holds an active reference to its network namespace while a\nrequest is processed. The per-netns exit path therefore cannot run\nconcurrently with SET, DEL, or GET for that socket\u0027s namespace."
        }
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      "metrics": [
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              "lang": "en",
              "value": "AV:L - The UAF is reached from the OVS datapath CT commit path (ovs_ct_execute/ovs_ct_check_limit) while the attacker\u0027s netns is torn down. Setup uses local genetlink (datapath, CT flow, CT_LIMIT SET) and packet injection via a vport (veth/TUN/internal) or OVS_PACKET_CMD_EXECUTE; this is not a remotely triggered protocol parser.\nAC:L - The attacker controls both sides of the race: they enable CT limits, install a CT-commit flow, inject packets so ovs_ct_check_limit runs under RCU, and destroy the netns so ovs_ct_limit_exit kfree()s the same object without a grace period. Success does not depend on victim-only timing.\nPR:L - OVS genetlink families are netnsok and use GENL_UNS_ADMIN_PERM, so CAP_NET_ADMIN is checked in the socket\u0027s user namespace (unshare -Urn). The fix commit states an unprivileged user can trigger the slab-use-after-free from a user and network namespace.\nUI:N - Exploitation needs only the attacker\u0027s own netlink setup, packet injection, and netns teardown. No victim action such as mounting a filesystem, opening a file, or clicking a prompt is required.\nS:U - This is kernel slab use-after-free in the host Open vSwitch datapath. Impact stays in the same kernel security authority and is not a VM escape, IOMMU/DMA bypass, or other cross-boundary compromise.\nC:H - ovs_ct_check_limit/ct_limit_get dereference freed ovs_ct_limit_info and walk its kmalloc\u0027d limits hlist after ovs_ct_limit_exit kfree()s them, a slab UAF that can be reclaimed and used for arbitrary kernel reads.\nI:H - With a finite zone limit, nf_conncount_count_skb() inserts into nf_conncount_data after nf_conncount_destroy(); combined with UAF of the limits table this is a write-after-free/heap primitive that can be turned into arbitrary write or control-flow hijack.\nA:H - The commit reports a slab-use-after-free in ovs_ct_execute() on netns teardown. UAF of CT-limit and conncount objects can oops/panic the kernel even when not fully exploited for code execution."
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        {
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      "title": "openvswitch: Fix CT limit teardown use-after-free",
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    "dateReserved": "2026-09-11T19:38:34.713Z",
    "dateUpdated": "2026-10-19T08:47:38.827Z",
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nsmb: client: clear setuid/setgid bit on write with cifsacl/modefromsid/posix extensions\n\nWhen a file has the setuid or setgid bit set and is written to, the VFS\nstrips those bits and issues a setattr with ATTR_KILL_SUID/ATTR_KILL_SGID\ntogether with an ATTR_MODE carrying the already-cleared mode.\n\nBoth cifs_setattr_unix() and cifs_setattr_nounix() unconditionally dropped\nATTR_MODE in that case:\n\n\t/* skip mode change if it\u0027s just for clearing setuid/setgid */\n\tif (attrs-\u003eia_valid \u0026 (ATTR_KILL_SUID|ATTR_KILL_SGID))\n\t\tattrs-\u003eia_valid \u0026= ~ATTR_MODE;\n\nThis is fine for the default mount, where the mode is only emulated via\nthe DOS read-only attribute and cannot represent the setuid/setgid bits\nanyway.  However, with the \"cifsacl\" or \"modefromsid\" mount options the\nmode is stored on the server through an ACL (id_mode_to_cifs_acl()), with\nthe SMB3.1.1 POSIX extensions the mode is sent to the server directly,\nand with the SMB1 Unix extensions (cifs_setattr_unix) the mode is sent\nvia CIFSSMBUnixSetPathInfo().  In all those cases dropping ATTR_MODE means\nthe cleared mode is never pushed to the server, so the setuid/setgid bit\nsurvives the write.\n\nThis is a security issue: on local filesystems the setuid bit is stripped\nwhen a file is written, but over these cifs.ko mounts the bit persists on\nthe server, potentially allowing an unexpected privilege escalation on\nsubsequent execution.\n\nFix this in two places:\n\n  1. cifs_setattr_nounix(): only take the \"skip mode change\" shortcut\n     when the mode is emulated via the DOS read-only attribute (i.e.\n     neither cifsacl/modefromsid nor the SMB3.1.1 POSIX extensions are\n     in effect), so that the cleared mode is propagated to the server\n     in the ACL / POSIX cases.\n\n  2. cifs_setattr_unix(): this function is only called when Unix\n     extensions are in effect, so the mode is always stored on the\n     server.  Remove the shortcut entirely so that the cleared mode is\n     always pushed."
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            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
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              "lang": "en",
              "value": "AV:L - The bug is in the CIFS client setattr path, reached by local write(2)/truncate(2) on an SMB mount: cifs_file_write_iter -\u003e netfs_file_write_iter -\u003e file_remove_privs -\u003e notify_change -\u003e cifs_setattr_unix/nounix. This is not ksmbd; a remote SMB peer cannot invoke the ATTR_MODE skip.\nAC:L - Once the share stores POSIX mode (cifsacl, modefromsid, SMB3.1.1 POSIX, or SMB1 Unix extensions), a write to a setuid/setgid file deterministically drops ATTR_MODE so the cleared bits are never pushed. The attacker controls the write and later exec, with no race or uninfluenced memory layout.\nPR:L - An unprivileged local user with write access to the setuid/setgid file (group/world-writable helper, or noperm) triggers file_remove_privs; ATTR_FORCE skips ownership/CAP_FSETID checks in setattr_prepare, and no init-namespace capability is required.\nUI:N - The attacker opens, writes, and execve()s the still-setuid file on an already-mounted share; no other user must mount the filesystem, confirm a prompt, or run the binary.\nS:U - Remaining setuid/setgid execution escalates privileges inside the same kernel/OS security authority and does not cross a VM, IOMMU, or sandbox boundary.\nC:H - After the attacker overwrites a privileged setuid/setgid helper, the uncleared bits allow execve of attacker-controlled contents as the file owner (including root on Samba POSIX/cifsacl deployments), disclosing all data that owner can read.\nI:H - The same still-setuid execution runs attacker-supplied file contents with the owner\u0027s privileges, enabling arbitrary writes and full integrity compromise, which is the POSIX reason those bits are stripped on write.\nA:H - Attacker-controlled code running as the privileged file owner can panic, halt, or disable the host, so successful exploitation yields complete availability loss."
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        {
          "url": "https://git.kernel.org/stable/c/b8e5dc4f95e5484159b343903f302eb6d783f2e6"
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      ],
      "title": "smb: client: clear setuid/setgid bit on write with cifsacl/modefromsid/posix extensions",
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    "dateReserved": "2026-09-11T19:38:34.740Z",
    "dateUpdated": "2026-10-30T12:32:23.806Z",
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{
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    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/pci/pci-sysfs.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "3556caa31a2bfbc22c11b812fd4ed8851c2d7bff",
              "status": "affected",
              "version": "eb627e17727ebeede70697ae1798688b0d328b54",
              "versionType": "git"
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              "lessThan": "cd07aef510ac6a2873e01f9ddddc5492490b0067",
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          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.4"
            },
            {
              "lessThan": "5.4",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
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              "status": "unaffected",
              "version": "6.18.57",
              "versionType": "semver"
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            {
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              "status": "unaffected",
              "version": "7.2.6",
              "versionType": "semver"
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            {
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              "status": "unaffected",
              "version": "7.3",
              "versionType": "original_commit_for_fix"
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          "nodes": [
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                  "versionEndExcluding": "6.18.57",
                  "versionStartIncluding": "5.4",
                  "vulnerable": true
                },
                {
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              ],
              "negate": false,
              "operator": "OR"
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          ]
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nPCI/sysfs: Add lockdown checks to legacy I/O and memory handlers\n\nCurrently, the legacy I/O and memory sysfs handlers do not check\nsecurity_locked_down(LOCKDOWN_PCI_ACCESS), leaving the legacy_io and\nlegacy_mem files unprotected when the kernel is locked down.\n\nCommit eb627e17727e (\"PCI: Lock down BAR access when the kernel is locked\ndown\") added the check to pci_write_config(), pci_mmap_resource(), and\npci_write_resource_io() to prevent userspace from programming DMA-capable\nhardware that could be used to modify kernel code, but did not cover the\nlegacy handlers.\n\nAs a result, root can still write arbitrary I/O ports and map the legacy\nI/O and memory spaces while the kernel is locked down, which is the same\ncapability the lockdown is meant to remove.\n\nAdd the same check to pci_write_legacy_io(), pci_mmap_legacy_mem(), and\npci_mmap_legacy_io().\n\nThese generic handlers cover both architectures that define HAVE_PCI_LEGACY\n(such as Alpha and PowerPC).\n\n[bhelgaas: add Link]"
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        "shortName": "Linux"
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        {
          "url": "https://git.kernel.org/stable/c/cd07aef510ac6a2873e01f9ddddc5492490b0067"
        },
        {
          "url": "https://git.kernel.org/stable/c/747b9bbbbdfdee51aee2456388f9b94b5086de4d"
        }
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      "title": "PCI/sysfs: Add lockdown checks to legacy I/O and memory handlers",
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    "cveId": "CVE-2026-90315",
    "datePublished": "2026-09-17T16:08:34.218Z",
    "dateReserved": "2026-09-11T19:38:34.801Z",
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