{
  "cveId": "CVE-2026-46110",
  "url": "https://patchblox.com/security/cve/CVE-2026-46110",
  "summary": "CVE-2026-46110 is fixed in 14 products on 1 platform, first by SUSE-SU-2026:22087-1, released June 5, 2026. It is not reported as exploited. Patch Radar priority: High.",
  "title": "linux: In the Linux kernel, the following vulnerability has been resolved:  net: stmmac: Prevent NULL deref when RX memory e...",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  net: stmmac: Prevent NULL deref when RX memory exhausted  The CPU receives frames from the MAC through conventional DMA: the CPU allocates buffers for the MAC, then the MAC fills them and returns ownership to the CPU. For each hardware RX queue, the CPU and MAC coordinate through a shared ring array of DMA descriptors: one descriptor per DMA buffer. Each descriptor includes the buffer\u0027s physical address and a status flag (\u0022OWN\u0022) indicating which side owns the buffer: OWN=0 for CPU, OWN=1 for MAC. The CPU is only allowed to set the flag and the MAC is only allowed to clear it, and both must move through the ring in sequence: thus the ring is used for both \u0022submissions\u0022 and \u0022completions.\u0022  In the stmmac driver, stmmac_rx() bookmarks its position in the ring with the \u0060cur_rx\u0060 index. The main receive loop in that function checks for rx_descs[cur_rx].own=0, gives the corresponding buffer to the network stack (NULLing the pointer), and increments \u0060cur_rx\u0060 modulo the ring size. After the loop exits, stmmac_rx_refill(), which bookmarks its position with \u0060dirty_rx\u0060, allocates fresh buffers and rearms the descriptors (setting OWN=1). If it fails any allocation, it simply stops early (leaving OWN=0) and will retry where it left off when next called.  This means descriptors have a three-stage lifecycle (terms my own): - \u0060empty\u0060 (OWN=1, buffer valid) - \u0060full\u0060 (OWN=0, buffer valid and populated) - \u0060dirty\u0060 (OWN=0, buffer NULL)  But because stmmac_rx() only checks OWN, it confuses \u0060full\u0060/\u0060dirty\u0060. In the past (see \u0027Fixes:\u0027), there was a bug where the loop could cycle \u0060cur_rx\u0060 all the way back to the first descriptor it dirtied, resulting in a NULL dereference when mistaken for \u0060full\u0060. The aforementioned commit resolved that *specific* failure by capping the loop\u0027s iteration limit at \u0060dma_rx_size - 1\u0060, but this is only a partial fix: if the previous stmmac_rx_refill() didn\u0027t complete, then there are leftover \u0060dirty\u0060 descriptors that the loop might encounter without needing to cycle fully around. The current code therefore panics (see \u0027Closes:\u0027) when stmmac_rx_refill() is memory-starved long enough for \u0060cur_rx\u0060 to catch up to \u0060dirty_rx\u0060.  Fix this by explicitly checking, before advancing \u0060cur_rx\u0060, if the next entry is dirty; exit the loop if so. This prevents processing of the final, used descriptor until stmmac_rx_refill() succeeds, but fully prevents the \u0060cur_rx == dirty_rx\u0060 ambiguity as the previous bugfix intended: so remove the clamp as well. Since stmmac_rx_zc() is a copy-paste-and-tweak of stmmac_rx() and the code structure is identical, any fix to stmmac_rx() will also need a corresponding fix for stmmac_rx_zc(). Therefore, apply the same check there.  In stmmac_rx() (not stmmac_rx_zc()), a related bug remains: after the MAC sets OWN=0 on the final descriptor, it will be unable to send any further DMA-complete IRQs until it\u0027s given more \u0060empty\u0060 descriptors. Currently, the driver simply *hopes* that the next stmmac_rx_refill() succeeds, risking an indefinite stall of the receive process if not. But this is not a regression, so it can be addressed in a future change.",
  "published": "2026-05-28T10:16:26Z",
  "severity": "high",
  "cvss": 7.5,
  "cvssVector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
  "epss": 0.00511,
  "epssPercentile": 0.43876,
  "priority": "High",
  "priorityTier": 3,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "fixes": [
    {
      "platform": "linux",
      "product": "kernel-64kb",
      "release": "sles 15.7",
      "fixedVersion": "6.4.0-150700.53.60.1",
      "fix": "SUSE-SU-2026:2482-1",
      "url": "https://patchblox.com/security/fix/linux/suse-su-2026-2482-1",
      "released": "2026-06-22T11:10:39Z"
    },
    {
      "platform": "linux",
      "product": "kernel-64kb",
      "release": "sles 16.0",
      "fixedVersion": "6.12.0-160000.34.1",
      "fix": "SUSE-SU-2026:22087-1",
      "url": "https://patchblox.com/security/fix/linux/suse-su-2026-22087-1",
      "released": "2026-06-05T17:10:52Z"
    },
    {
      "platform": "linux",
      "product": "kernel-azure",
      "release": "sles 15.7",
      "fixedVersion": "6.4.0-150700.53.60.1",
      "fix": "SUSE-SU-2026:2482-1",
      "url": "https://patchblox.com/security/fix/linux/suse-su-2026-2482-1",
      "released": "2026-06-22T11:10:39Z"
    },
    {
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      "product": "kernel-azure",
      "release": "sles 16.0",
      "fixedVersion": "6.12.0-160000.34.1",
      "fix": "SUSE-SU-2026:22087-1",
      "url": "https://patchblox.com/security/fix/linux/suse-su-2026-22087-1",
      "released": "2026-06-05T17:10:52Z"
    },
    {
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      "product": "kernel-default",
      "release": "sles 15.7",
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      "fix": "SUSE-SU-2026:2482-1",
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      "released": "2026-06-22T11:10:39Z"
    },
    {
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      "fix": "SUSE-SU-2026:22087-1",
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      "released": "2026-06-05T17:10:52Z"
    },
    {
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      "released": "2026-06-22T11:10:39Z"
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    {
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      "fix": "SUSE-SU-2026:22087-1",
      "url": "https://patchblox.com/security/fix/linux/suse-su-2026-22087-1",
      "released": "2026-06-05T17:10:52Z"
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      "product": "kernel-docs",
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      "fix": "SUSE-SU-2026:2482-1",
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      "fix": "SUSE-SU-2026:22087-1",
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      "released": "2026-06-05T17:10:52Z"
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      "released": "2026-06-05T17:10:52Z"
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    {
      "platform": "linux",
      "product": "kernel-livepatch-SLE15-SP7-RT_Update_16",
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      "fix": "SUSE-SU-2026:2591-1",
      "url": "https://patchblox.com/security/fix/linux/suse-su-2026-2591-1",
      "released": "2026-06-23T14:31:51Z"
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      "fix": "SUSE-SU-2026:2482-1",
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      "released": "2026-06-22T11:10:39Z"
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      "released": "2026-06-22T11:10:39Z"
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    {
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  "noFixYet": [],
  "dataAsOf": "2026-11-08T06:59:42Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}