CVE-2026-46331 (GCVE-0-2026-46331)
Vulnerability from cvelistv5
Published
2026-06-16 06:26
Modified
2026-08-24 12:06
Summary
In the Linux kernel, the following vulnerability has been resolved: net/sched: fix pedit partial COW leading to page cache corruption tcf_pedit_act() computes the COW range for skb_ensure_writable() once before the key loop using tcfp_off_max_hint, but the hint does not account for the runtime header offset added by typed keys. This can leave part of the write region un-COW'd. Fix by moving skb_ensure_writable() inside the per-key loop where the actual write offset is known, and add overflow checking on the offset arithmetic. For negative offsets (e.g. Ethernet header edits at ingress), use skb_cow() to COW the headroom instead. Guard offset_valid() against INT_MIN, where negation is undefined.
Impacted products
Vendor Product Version
Linux Linux Version: abe35bf3be51482593076d516a680d79e5fbc8e1
Version: b773640d5bb9e2acfd91e2695717af04d47aa116
Version: 8b796475fd7882663a870456466a4fb315cc1bd6
Version: 8b796475fd7882663a870456466a4fb315cc1bd6
Version: 8b796475fd7882663a870456466a4fb315cc1bd6
Version: 8b796475fd7882663a870456466a4fb315cc1bd6
Version: 8b796475fd7882663a870456466a4fb315cc1bd6
Version: 8b796475fd7882663a870456466a4fb315cc1bd6
Version: d0c38a914b0c4c21d553da801003d36979016726
Version: 2ec2dd7d51a9320151f275ddbb2b53260fb32ca1
Version: c19cc520b3d69904e9518d401ad0df7f4702aca0
Version: 5.10.117   
Version: 5.15.41   
Version: 4.19.244   
Version: 5.4.195   
Version: 5.17.9   
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              "value": "AV:L - The vulnerable pedit action is reached through local tc/rtnetlink configuration and local packet generation, not by unauthenticated network input alone. Even if remote traffic can traverse an already configured pedit rule, creating the exploitable action is a local operation.\nAC:L - There is no attacker-uncontrolled race; the attacker can choose the pedit key, header type, offset, and traffic shape. The partial COW condition is deterministic once suitable shared or page-cache-backed skbs are generated.\nPR:L - Installing the pedit action through RTM_NEWTFILTER requires CAP_NET_ADMIN in the network namespace. With unprivileged user namespaces, a basic local user can obtain namespace CAP_NET_ADMIN, so this is Low rather than High.\nUI:N - The attacker can configure the tc action and generate the triggering traffic without requiring any victim action. No user needs to open a file, mount a filesystem, or interact with crafted data.\nS:U - The vulnerability is in the kernel networking subsystem and impacts kernel-managed memory and page cache within the same security authority. It is a standard local kernel privilege-escalation/data-corruption issue, not a VM escape or separate-scope boundary bypass.\nC:H - The bug permits corruption of shared skb/page-cache memory outside the intended COW range, which is kernel memory/data corruption. Such corruption is defensibly usable for privilege escalation, after which protected information can be read.\nI:H - The vulnerable path gives attacker-influenced writes into shared page-cache-backed packet data that should have been private. This can corrupt protected data or code pages and is defensibly a high-integrity arbitrary data modification primitive.\nA:H - Repeated page cache or kernel memory corruption can crash the kernel, corrupt critical cached files, or destabilize networking and userspace execution. A kernel crash or system-wide corruption warrants High availability impact."
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          "url": "https://git.kernel.org/stable/c/544d857b42a1734b923040e13aa61a6fd4746cf2"
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          "url": "https://git.kernel.org/stable/c/d5d01d35a5a7d36f7cb679b67d9cbdd5205672dc"
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        },
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          "url": "https://git.kernel.org/stable/c/899ee91156e57784090c5565e4f31bd7dbffbc5a"
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      "title": "net/sched: fix pedit partial COW leading to page cache corruption",
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    "cveId": "CVE-2026-46331",
    "datePublished": "2026-06-16T06:26:21.066Z",
    "dateReserved": "2026-05-13T15:03:33.112Z",
    "dateUpdated": "2026-08-24T12:06:51.076Z",
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Even if remote traffic can traverse an already configured pedit rule, creating the exploitable action is a local operation.\\nAC:L - There is no attacker-uncontrolled race; the attacker can choose the pedit key, header type, offset, and traffic shape. The partial COW condition is deterministic once suitable shared or page-cache-backed skbs are generated.\\nPR:L - Installing the pedit action through RTM_NEWTFILTER requires CAP_NET_ADMIN in the network namespace. With unprivileged user namespaces, a basic local user can obtain namespace CAP_NET_ADMIN, so this is Low rather than High.\\nUI:N - The attacker can configure the tc action and generate the triggering traffic without requiring any victim action. No user needs to open a file, mount a filesystem, or interact with crafted data.\\nS:U - The vulnerability is in the kernel networking subsystem and impacts kernel-managed memory and page cache within the same security authority. It is a standard local kernel privilege-escalation/data-corruption issue, not a VM escape or separate-scope boundary bypass.\\nC:H - The bug permits corruption of shared skb/page-cache memory outside the intended COW range, which is kernel memory/data corruption. Such corruption is defensibly usable for privilege escalation, after which protected information can be read.\\nI:H - The vulnerable path gives attacker-influenced writes into shared page-cache-backed packet data that should have been private. This can corrupt protected data or code pages and is defensibly a high-integrity arbitrary data modification primitive.\\nA:H - Repeated page cache or kernel memory corruption can crash the kernel, corrupt critical cached files, or destabilize networking and userspace execution. 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      "cveMetadata": "{\"cveId\": \"CVE-2026-46331\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-08-24T12:06:51.076Z\", \"dateReserved\": \"2026-05-13T15:03:33.112Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2026-06-16T06:26:21.066Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
  • Confirmed: The vulnerability is confirmed from an analyst perspective.
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  • Not patched: This vulnerability was not successfully patched by the user reporting the sighting.


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