CVE-2026-53091 (GCVE-0-2026-53091)
Vulnerability from cvelistv5
Published
2026-06-24 16:30
Modified
2026-10-21 12:41
Severity ?
8.4 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: net: pull headers in qdisc_pkt_len_segs_init() Most ndo_start_xmit() methods expects headers of gso packets to be already in skb->head. net/core/tso.c users are particularly at risk, because tso_build_hdr() does a memcpy(hdr, skb->data, hdr_len); qdisc_pkt_len_segs_init() already does a dissection of gso packets. Use pskb_may_pull() instead of skb_header_pointer() to make sure drivers do not have to reimplement this. Some malicious packets could be fed, detect them so that we can drop them sooner with a new SKB_DROP_REASON_SKB_BAD_GSO drop_reason.
References
Impacted products
Vendor Product Version
Linux Linux Version: e876f208af18b074f800656e4d1b99da75b2135f
Version: e876f208af18b074f800656e4d1b99da75b2135f
Version: e876f208af18b074f800656e4d1b99da75b2135f
Version: e876f208af18b074f800656e4d1b99da75b2135f
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[\"vendor-advisory\", \"x_refsource_REDHAT\"]}, {\"url\": \"https://access.redhat.com/errata/RHSA-2026:67150\", \"tags\": [\"vendor-advisory\", \"x_refsource_REDHAT\"]}, {\"url\": \"https://access.redhat.com/errata/RHSA-2026:66325\", \"tags\": [\"vendor-advisory\", \"x_refsource_REDHAT\"]}, {\"url\": \"https://access.redhat.com/errata/RHSA-2026:66324\", \"tags\": [\"vendor-advisory\", \"x_refsource_REDHAT\"]}], \"x_generator\": {\"engine\": \"sadp-cli 1.0.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"A flaw was found in the Linux kernel\u0027s handling of Generic Segmentation Offload (GSO) packet headers. This vulnerability occurs when the `qdisc_pkt_len_segs_init()` function does not properly pull headers into the expected memory location, which can lead to incorrect processing by network drivers. A remote attacker could exploit this by sending specially crafted malicious packets, potentially causing a denial of service (DoS) or other unexpected system behavior.\"}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-131\", \"description\": \"Incorrect Calculation of Buffer Size\"}]}], \"providerMetadata\": {\"orgId\": \"0b0ca135-0b70-47e7-9f44-1890c2a1c46c\", \"shortName\": \"redhat-SADP\", \"dateUpdated\": \"2026-09-14T12:04:34.429Z\"}}, {\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2026-53091\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2026-10-16T15:25:34.531794Z\"}}}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-131\", \"description\": \"CWE-131 Incorrect Calculation of Buffer Size\"}]}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2026-10-16T15:25:35.142Z\"}}], \"cna\": {\"title\": \"net: pull headers in qdisc_pkt_len_segs_init()\", \"metrics\": [{\"cvssV3_1\": {\"version\": \"3.1\", \"baseScore\": 8.4, \"baseSeverity\": \"HIGH\", \"vectorString\": \"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:H\"}, \"scenarios\": [{\"lang\": \"en\", \"value\": \"AV:L - The vulnerable code is reached through local transmit paths such as AF_PACKET, TUN/TAP, or guest virtio/tap injection where an attacker can supply GSO metadata. Ordinary remote packets do not carry this malformed skb/GSO state on the wire.\\nAC:L - No race or external timing condition is required. The attacker controls the GSO header metadata and packet layout needed to make qdisc accept a header that later TX code expects to be linear.\\nPR:L - AF_PACKET requires CAP_NET_RAW in the target network namespace, and TUN/TAP style paths require CAP_NET_ADMIN or access to an existing tap/tun file descriptor. These are reachable as low privilege in user-namespace or guest/tap deployments rather than requiring init-namespace root in the highest reasonable scenario.\\nUI:N - No victim user action is needed once the attacker can inject the crafted local/guest packet. The transmit path processes the skb automatically.\\nS:C - In virtualization deployments, a guest-controlled GSO packet can be processed by the host kernel tap/vhost transmit path and affect host kernel memory or availability. That crosses the guest-to-host security boundary.\\nC:H - TSO helpers copy header bytes directly from skb-\u003edata, so a header accepted via skb_header_pointer() but not pulled into skb-\u003ehead can leak adjacent kernel memory into transmitted segment headers. This is an out-of-bounds kernel read and is scored High.\\nI:N - The investigated primitive is incorrect header linearity causing out-of-bounds reads and crashes, not a demonstrated attacker-controlled write or protected data modification. I did not find a reliable integrity-impacting write primitive from this fix.\\nA:H - Malformed GSO packets can trigger kernel faults or invalid driver/TSO behavior during transmit, including panics reported for this issue. Repeated local injection can therefore cause high availability impact.\"}]}], \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"e876f208af18b074f800656e4d1b99da75b2135f\", \"lessThan\": \"5895cfc76924a629c6eaa5e5f049de642860045f\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"e876f208af18b074f800656e4d1b99da75b2135f\", \"lessThan\": \"7564dc804d8289d2e5c6edb8173754051b71bff4\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"e876f208af18b074f800656e4d1b99da75b2135f\", \"lessThan\": \"9d4f5c68f5ad4ab425f3ce1500c97c9f9743999a\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"e876f208af18b074f800656e4d1b99da75b2135f\", \"lessThan\": \"7fb4c19670110f052c04e1ec1d2b953b9f4f57e4\", \"versionType\": \"git\"}], \"programFiles\": [\"include/net/dropreason-core.h\", \"net/core/dev.c\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"3.16\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"3.16\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"6.6.160\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.6.*\"}, {\"status\": \"unaffected\", \"version\": \"6.12.114\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.12.*\"}, {\"status\": \"unaffected\", \"version\": \"7.0.10\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"7.0.*\"}, {\"status\": \"unaffected\", \"version\": \"7.1\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"include/net/dropreason-core.h\", \"net/core/dev.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/5895cfc76924a629c6eaa5e5f049de642860045f\"}, {\"url\": \"https://git.kernel.org/stable/c/7564dc804d8289d2e5c6edb8173754051b71bff4\"}, {\"url\": \"https://git.kernel.org/stable/c/9d4f5c68f5ad4ab425f3ce1500c97c9f9743999a\"}, {\"url\": \"https://git.kernel.org/stable/c/7fb4c19670110f052c04e1ec1d2b953b9f4f57e4\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\nnet: pull headers in qdisc_pkt_len_segs_init()\\n\\nMost ndo_start_xmit() methods expects headers of gso packets\\nto be already in skb-\u003ehead.\\n\\nnet/core/tso.c users are particularly at risk, because tso_build_hdr()\\ndoes a memcpy(hdr, skb-\u003edata, hdr_len);\\n\\nqdisc_pkt_len_segs_init() already does a dissection of gso packets.\\n\\nUse pskb_may_pull() instead of skb_header_pointer() to make\\nsure drivers do not have to reimplement this.\\n\\nSome malicious packets could be fed, detect them so that we can\\ndrop them sooner with a new SKB_DROP_REASON_SKB_BAD_GSO drop_reason.\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6.160\", \"versionStartIncluding\": \"3.16\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.12.114\", \"versionStartIncluding\": \"3.16\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"7.0.10\", \"versionStartIncluding\": \"3.16\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"7.1\", \"versionStartIncluding\": \"3.16\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-10-21T12:41:56.505Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2026-53091\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-10-21T12:41:56.505Z\", \"dateReserved\": \"2026-06-09T07:44:35.384Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2026-06-24T16:30:30.290Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


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