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              "status": "unaffected",
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              "status": "unaffected",
              "version": "6.7.2",
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            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.8",
              "versionType": "original_commit_for_fix"
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      "cpeApplicability": [
        {
          "nodes": [
            {
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                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.10.209",
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                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmlxsw: spectrum_acl_tcam: Fix stack corruption\n\nWhen tc filters are first added to a net device, the corresponding local\nport gets bound to an ACL group in the device. The group contains a list\nof ACLs. In turn, each ACL points to a different TCAM region where the\nfilters are stored. During forwarding, the ACLs are sequentially\nevaluated until a match is found.\n\nOne reason to place filters in different regions is when they are added\nwith decreasing priorities and in an alternating order so that two\nconsecutive filters can never fit in the same region because of their\nkey usage.\n\nIn Spectrum-2 and newer ASICs the firmware started to report that the\nmaximum number of ACLs in a group is more than 16, but the layout of the\nregister that configures ACL groups (PAGT) was not updated to account\nfor that. It is therefore possible to hit stack corruption [1] in the\nrare case where more than 16 ACLs in a group are required.\n\nFix by limiting the maximum ACL group size to the minimum between what\nthe firmware reports and the maximum ACLs that fit in the PAGT register.\n\nAdd a test case to make sure the machine does not crash when this\ncondition is hit.\n\n[1]\nKernel panic - not syncing: stack-protector: Kernel stack is corrupted in: mlxsw_sp_acl_tcam_group_update+0x116/0x120\n[...]\n dump_stack_lvl+0x36/0x50\n panic+0x305/0x330\n __stack_chk_fail+0x15/0x20\n mlxsw_sp_acl_tcam_group_update+0x116/0x120\n mlxsw_sp_acl_tcam_group_region_attach+0x69/0x110\n mlxsw_sp_acl_tcam_vchunk_get+0x492/0xa20\n mlxsw_sp_acl_tcam_ventry_add+0x25/0xe0\n mlxsw_sp_acl_rule_add+0x47/0x240\n mlxsw_sp_flower_replace+0x1a9/0x1d0\n tc_setup_cb_add+0xdc/0x1c0\n fl_hw_replace_filter+0x146/0x1f0\n fl_change+0xc17/0x1360\n tc_new_tfilter+0x472/0xb90\n rtnetlink_rcv_msg+0x313/0x3b0\n netlink_rcv_skb+0x58/0x100\n netlink_unicast+0x244/0x390\n netlink_sendmsg+0x1e4/0x440\n ____sys_sendmsg+0x164/0x260\n ___sys_sendmsg+0x9a/0xe0\n __sys_sendmsg+0x7a/0xc0\n do_syscall_64+0x40/0xe0\n entry_SYSCALL_64_after_hwframe+0x63/0x6b"
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.8,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:L - The vulnerability is reached through the rtnetlink/`tc filter add` path via the `sendmsg()` syscall on a netlink socket, requiring local system access. Network packets traversing the switch cannot reach the ACL group configuration code, which only runs on control-plane filter installation.\nAC:L - The attacker deterministically forces more than 16 ACLs into one group by adding flower filters with decreasing priorities in an alternating key layout so consecutive filters cannot share a TCAM region \u2014 the exact sequence the added selftest performs. There is no race, no timing window, and no dependence on unpredictable memory layout.\nPR:L - `rtnetlink_rcv_msg` gates filter creation on CAP_NET_ADMIN, a delegated capability well short of full root that is routinely granted to network-management daemons and `--net=host --cap-add=NET_ADMIN` containers on the switch platforms where mlxsw is deployed. Such a semi-privileged context crosses a real boundary by smashing the kernel stack.\nUI:N - The attacker installs the tc filters entirely on their own; no victim action, no mount, and no file open is involved. The overflow occurs synchronously inside the attacker\u0027s own syscall.\nS:U - The corrupted memory is the kernel stack of the calling thread, and the impact stays within the kernel\u0027s own security authority. No hypervisor, IOMMU, or sandbox boundary is crossed.\nC:H - Each out-of-bounds iteration read-modify-writes stack memory beyond the 112-byte `pagt_pl` buffer, and the resulting corruption of saved registers and the return address is the kind of memory corruption that can be steered toward disclosing kernel memory. Per the higher-severity rule for out-of-bounds writes on the kernel stack, this is scored High.\nI:H - This is an out-of-bounds write that walks linearly past the end of a fixed 112-byte stack buffer, overwriting the stack canary, saved registers, and return address with values partially controlled by the attacker (region IDs and the `multi` bit). Out-of-bounds writes into a kernel stack frame are treated as High integrity impact.\nA:H - The documented and reproducible outcome is `Kernel panic - not syncing: stack-protector: Kernel stack is corrupted`, an unconditional panic that takes down the entire switch. The condition is triggered on demand and repeatably."
            }
          ]
        }
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        "dateUpdated": "2026-08-05T11:26:05.421Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/56750ea5d15426b5f307554e7699e8b5f76c3182"
        },
        {
          "url": "https://git.kernel.org/stable/c/348112522a35527c5bcba933b9fefb40a4f44f15"
        },
        {
          "url": "https://git.kernel.org/stable/c/6fd24675188d354b1cad47462969afa2ab09d819"
        },
        {
          "url": "https://git.kernel.org/stable/c/2f5e1565740490706332c06f36211d4ce0f88e62"
        },
        {
          "url": "https://git.kernel.org/stable/c/a361c2c1da5dbb13ca67601cf961ab3ad68af383"
        },
        {
          "url": "https://git.kernel.org/stable/c/483ae90d8f976f8339cf81066312e1329f2d3706"
        }
      ],
      "title": "mlxsw: spectrum_acl_tcam: Fix stack corruption",
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  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2024-26586",
    "datePublished": "2024-02-22T16:13:31.796Z",
    "dateReserved": "2024-02-19T14:20:24.125Z",
    "dateUpdated": "2026-08-05T11:26:05.421Z",
    "state": "PUBLISHED"
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}