CVE-2025-37752 (GCVE-0-2025-37752)
Vulnerability from cvelistv5
Published
2025-05-01 12:55
Modified
2026-08-05 11:57
Severity ?
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: net_sched: sch_sfq: move the limit validation It is not sufficient to directly validate the limit on the data that the user passes as it can be updated based on how the other parameters are changed. Move the check at the end of the configuration update process to also catch scenarios where the limit is indirectly updated, for example with the following configurations: tc qdisc add dev dummy0 handle 1: root sfq limit 2 flows 1 depth 1 tc qdisc add dev dummy0 handle 1: root sfq limit 2 flows 1 divisor 1 This fixes the following syzkaller reported crash: ------------[ cut here ]------------ UBSAN: array-index-out-of-bounds in net/sched/sch_sfq.c:203:6 index 65535 is out of range for type 'struct sfq_head[128]' CPU: 1 UID: 0 PID: 3037 Comm: syz.2.16 Not tainted 6.14.0-rc2-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 12/27/2024 Call Trace: <TASK> __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x201/0x300 lib/dump_stack.c:120 ubsan_epilogue lib/ubsan.c:231 [inline] __ubsan_handle_out_of_bounds+0xf5/0x120 lib/ubsan.c:429 sfq_link net/sched/sch_sfq.c:203 [inline] sfq_dec+0x53c/0x610 net/sched/sch_sfq.c:231 sfq_dequeue+0x34e/0x8c0 net/sched/sch_sfq.c:493 sfq_reset+0x17/0x60 net/sched/sch_sfq.c:518 qdisc_reset+0x12e/0x600 net/sched/sch_generic.c:1035 tbf_reset+0x41/0x110 net/sched/sch_tbf.c:339 qdisc_reset+0x12e/0x600 net/sched/sch_generic.c:1035 dev_reset_queue+0x100/0x1b0 net/sched/sch_generic.c:1311 netdev_for_each_tx_queue include/linux/netdevice.h:2590 [inline] dev_deactivate_many+0x7e5/0xe70 net/sched/sch_generic.c:1375
References
Impacted products
Vendor Product Version
Linux Linux Version: e12f6013d0a69660e8b99bfe381b9546ae667328
Version: 1e6d9d87626cf89eeffb4d943db12cb5b10bf961
Version: 1b562b7f9231432da40d12e19786c1bd7df653a7
Version: 35d0137305ae2f97260a9047f445bd4434bd6cc7
Version: 833e9a1c27b82024db7ff5038a51651f48f05e5e
Version: 7d8947f2153ee9c5ab4cb17861a11cc45f30e8c4
Version: 7fefc294204f10a3405f175f4ac2be16d63f135e
Version: 10685681bafce6febb39770f3387621bf5d67d0b
Version: 10685681bafce6febb39770f3387621bf5d67d0b
Version: 6.1.129   ≤
Version: 6.6.76   ≤
Version: 6.12.13   ≤
Version: 6.13.2   ≤
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          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet_sched: sch_sfq: move the limit validation\n\nIt is not sufficient to directly validate the limit on the data that\nthe user passes as it can be updated based on how the other parameters\nare changed.\n\nMove the check at the end of the configuration update process to also\ncatch scenarios where the limit is indirectly updated, for example\nwith the following configurations:\n\ntc qdisc add dev dummy0 handle 1: root sfq limit 2 flows 1 depth 1\ntc qdisc add dev dummy0 handle 1: root sfq limit 2 flows 1 divisor 1\n\nThis fixes the following syzkaller reported crash:\n\n------------[ cut here ]------------\nUBSAN: array-index-out-of-bounds in net/sched/sch_sfq.c:203:6\nindex 65535 is out of range for type \u0027struct sfq_head[128]\u0027\nCPU: 1 UID: 0 PID: 3037 Comm: syz.2.16 Not tainted 6.14.0-rc2-syzkaller #0\nHardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 12/27/2024\nCall Trace:\n \u003cTASK\u003e\n __dump_stack lib/dump_stack.c:94 [inline]\n dump_stack_lvl+0x201/0x300 lib/dump_stack.c:120\n ubsan_epilogue lib/ubsan.c:231 [inline]\n __ubsan_handle_out_of_bounds+0xf5/0x120 lib/ubsan.c:429\n sfq_link net/sched/sch_sfq.c:203 [inline]\n sfq_dec+0x53c/0x610 net/sched/sch_sfq.c:231\n sfq_dequeue+0x34e/0x8c0 net/sched/sch_sfq.c:493\n sfq_reset+0x17/0x60 net/sched/sch_sfq.c:518\n qdisc_reset+0x12e/0x600 net/sched/sch_generic.c:1035\n tbf_reset+0x41/0x110 net/sched/sch_tbf.c:339\n qdisc_reset+0x12e/0x600 net/sched/sch_generic.c:1035\n dev_reset_queue+0x100/0x1b0 net/sched/sch_generic.c:1311\n netdev_for_each_tx_queue include/linux/netdevice.h:2590 [inline]\n dev_deactivate_many+0x7e5/0xe70 net/sched/sch_generic.c:1375"
        }
      ],
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          "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 only by configuring an SFQ qdisc through RTM_NEWQDISC netlink messages plus locally generated traffic; per kernel scoring guidance tc/netlink qdisc configuration is a local attack surface with no remote or adjacent reachability.\nAC:L - The attacker fully controls every precondition \u2014 the TBF-over-SFQ hierarchy, the `limit 2 flows 1 depth 1` parameters that collapse the effective limit to 1, and the packet injection that drives the qlen underflow \u2014 and the upstream commit ships a deterministic shell reproducer with no race or memory-layout dependency.\nPR:L - Qdisc configuration requires CAP_NET_ADMIN only over the target network namespace (`netlink_net_capable()` in net/core/rtnetlink.c), which any unprivileged user obtains with `unshare -Urn`, and the loopback device inside that namespace is sufficient to drive the traffic.\nUI:N - The attacker performs the qdisc setup and packet transmission entirely on its own; no victim action, mount, or interaction is required.\nS:U - The corruption occurs in kernel heap memory within the same security authority as the attacker\u0027s escalation target, with no crossing of a VM, IOMMU, or sandbox boundary.\nC:H - `n = q-\u003edep[65535].next` reads a u16 from roughly 256 KB beyond the ~1.4 KB kzalloc\u0027d qdisc object, and the resulting out-of-bounds heap corruption is of the class that can be leveraged into an arbitrary-read primitive against adjacent kernel objects.\nI:H - Two out-of-bounds writes occur \u2014 `q-\u003edep[65535].next = x` at a fixed +262140-byte offset and `sfq_dep_head(q, n)-\u003eprev = x` at an offset derived from groomable heap contents \u2014 giving an attacker-influenced write of an attacker-chosen u16 into unrelated slab memory, an exploitable control-flow corruption primitive.\nA:H - The access is an array-index-out-of-bounds flagged by UBSAN (panicking on panic_on_warn kernels) and, absent instrumentation, silently corrupts unrelated kernel memory or touches unmapped addresses, causing oops or panic; the sequence can be repeated at will."
            }
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        }
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        "dateUpdated": "2026-08-05T11:57:17.026Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/8fadc871a42933aacb7f1ce9ed9a96485e2c9cf4"
        },
        {
          "url": "https://git.kernel.org/stable/c/7d62ded97db6b7c94c891f704151f372b1ba4688"
        },
        {
          "url": "https://git.kernel.org/stable/c/6c589aa318023690f1606c666a7fb5f4c1c9c219"
        },
        {
          "url": "https://git.kernel.org/stable/c/1348214fa042a71406964097e743c87a42c85a49"
        },
        {
          "url": "https://git.kernel.org/stable/c/d2718324f9e329b10ddc091fba5a0ba2b9d4d96a"
        },
        {
          "url": "https://git.kernel.org/stable/c/f86293adce0c201cfabb283ef9d6f21292089bb8"
        },
        {
          "url": "https://git.kernel.org/stable/c/5e5e1fcc1b8ed57f902c424c5d9b328a3a19073d"
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        {
          "url": "https://git.kernel.org/stable/c/b36a68192037d1614317a09b0d78c7814e2eecf9"
        },
        {
          "url": "https://git.kernel.org/stable/c/b3bf8f63e6179076b57c9de660c9f80b5abefe70"
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      "title": "net_sched: sch_sfq: move the limit validation",
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  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2025-37752",
    "datePublished": "2025-05-01T12:55:57.280Z",
    "dateReserved": "2025-04-16T04:51:23.937Z",
    "dateUpdated": "2026-08-05T11:57:17.026Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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