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CVE-2024-26665 (GCVE-0-2024-26665)

Vulnerability from cvelistv5 – Published: 2024-04-02 06:22 – Updated: 2026-08-05 11:26
VLAI
Title
tunnels: fix out of bounds access when building IPv6 PMTU error
Summary
In the Linux kernel, the following vulnerability has been resolved: tunnels: fix out of bounds access when building IPv6 PMTU error If the ICMPv6 error is built from a non-linear skb we get the following splat, BUG: KASAN: slab-out-of-bounds in do_csum+0x220/0x240 Read of size 4 at addr ffff88811d402c80 by task netperf/820 CPU: 0 PID: 820 Comm: netperf Not tainted 6.8.0-rc1+ #543 ... kasan_report+0xd8/0x110 do_csum+0x220/0x240 csum_partial+0xc/0x20 skb_tunnel_check_pmtu+0xeb9/0x3280 vxlan_xmit_one+0x14c2/0x4080 vxlan_xmit+0xf61/0x5c00 dev_hard_start_xmit+0xfb/0x510 __dev_queue_xmit+0x7cd/0x32a0 br_dev_queue_push_xmit+0x39d/0x6a0 Use skb_checksum instead of csum_partial who cannot deal with non-linear SKBs.
Severity
9.1 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2024-09-10 15:53 UTC
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 4cb47a8644cc9eb8ec81190a50e79e6530d0297f , < e77bf828f1ca1c47fcff58bdc26b60a9d3dfbe1d (git)
Affected: 4cb47a8644cc9eb8ec81190a50e79e6530d0297f , < d964dd1bc1452594b4207d9229c157d9386e5d8a (git)
Affected: 4cb47a8644cc9eb8ec81190a50e79e6530d0297f , < e37cde7a5716466ff2a76f7f27f0a29b05b9a732 (git)
Affected: 4cb47a8644cc9eb8ec81190a50e79e6530d0297f , < 510c869ffa4068c5f19ff4df51d1e2f3a30aaac1 (git)
Affected: 4cb47a8644cc9eb8ec81190a50e79e6530d0297f , < 7dc9feb8b1705cf00de20563b6bc4831f4c99dab (git)
Affected: 4cb47a8644cc9eb8ec81190a50e79e6530d0297f , < d75abeec401f8c86b470e7028a13fcdc87e5dd06 (git)
guessed Create a notification for this product.
Linux Linux Affected: 5.9
Unaffected: 0 , < 5.9 (semver)
Unaffected: 5.10.210 , ≤ 5.10.* (semver)
Unaffected: 5.15.149 , ≤ 5.15.* (semver)
Unaffected: 6.1.78 , ≤ 6.1.* (semver)
Unaffected: 6.6.17 , ≤ 6.6.* (semver)
Unaffected: 6.7.5 , ≤ 6.7.* (semver)
Unaffected: 6.8 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ntunnels: fix out of bounds access when building IPv6 PMTU error\n\nIf the ICMPv6 error is built from a non-linear skb we get the following\nsplat,\n\n  BUG: KASAN: slab-out-of-bounds in do_csum+0x220/0x240\n  Read of size 4 at addr ffff88811d402c80 by task netperf/820\n  CPU: 0 PID: 820 Comm: netperf Not tainted 6.8.0-rc1+ #543\n  ...\n   kasan_report+0xd8/0x110\n   do_csum+0x220/0x240\n   csum_partial+0xc/0x20\n   skb_tunnel_check_pmtu+0xeb9/0x3280\n   vxlan_xmit_one+0x14c2/0x4080\n   vxlan_xmit+0xf61/0x5c00\n   dev_hard_start_xmit+0xfb/0x510\n   __dev_queue_xmit+0x7cd/0x32a0\n   br_dev_queue_push_xmit+0x39d/0x6a0\n\nUse skb_checksum instead of csum_partial who cannot deal with non-linear\nSKBs."
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          "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: t\u00faneles: corrige el acceso fuera de los l\u00edmites al compilar el error IPv6 PMTU Si el error ICMPv6 se genera a partir de un skb no lineal, obtenemos el siguiente s\u00edmbolo, ERROR: KASAN: slab-out- fuera de los l\u00edmites en do_csum+0x220/0x240 Lectura de tama\u00f1o 4 en la direcci\u00f3n ffff88811d402c80 por tarea netperf/820 CPU: 0 PID: 820 Comm: netperf Not tainted 6.8.0-rc1+ #543 ... kasan_report+0xd8/0x110 do_csum+0x220 /0x240 csum_partial+0xc/0x20 skb_tunnel_check_pmtu+0xeb9/0x3280 vxlan_xmit_one+0x14c2/0x4080 vxlan_xmit+0xf61/0x5c00 dev_hard_start_xmit+0xfb/0x510 __dev_queue_xmit+0x7cd/0x32 a0 br_dev_queue_push_xmit+0x39d/0x6a0 Utilice skb_checksum en lugar de csum_partial, que no puede manejar SKB no lineales."
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            {
              "lang": "en",
              "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ntunnels: fix out of bounds access when building IPv6 PMTU error\n\nIf the ICMPv6 error is built from a non-linear skb we get the following\nsplat,\n\n  BUG: KASAN: slab-out-of-bounds in do_csum+0x220/0x240\n  Read of size 4 at addr ffff88811d402c80 by task netperf/820\n  CPU: 0 PID: 820 Comm: netperf Not tainted 6.8.0-rc1+ #543\n  ...\n   kasan_report+0xd8/0x110\n   do_csum+0x220/0x240\n   csum_partial+0xc/0x20\n   skb_tunnel_check_pmtu+0xeb9/0x3280\n   vxlan_xmit_one+0x14c2/0x4080\n   vxlan_xmit+0xf61/0x5c00\n   dev_hard_start_xmit+0xfb/0x510\n   __dev_queue_xmit+0x7cd/0x32a0\n   br_dev_queue_push_xmit+0x39d/0x6a0\n\nUse skb_checksum instead of csum_partial who cannot deal with non-linear\nSKBs."
            }
          ],
          "metrics": [
            {
              "cvssV3_1": {
                "baseScore": 9.1,
                "baseSeverity": "CRITICAL",
                "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H",
                "version": "3.1"
              },
              "scenarios": [
                {
                  "lang": "en",
                  "value": "AV:N - The overread is triggered by an ordinary over-MTU IPv6 packet forwarded out a VXLAN/Geneve device enslaved to a bridge or OVS port, a standard cloud/container overlay topology. The L3 source address is unconstrained (only unspecified/multicast/loopback sources are filtered), so an off-link remote sender whose packet is routed to a workload behind the overlay reaches the vulnerable code.\nAC:L - The attacker only needs to send an IPv6 packet larger than the tunnel\u0027s inner MTU; non-linear skbs are the normal case for large frames under GRO, header-split NICs, and virtio-net mergeable buffers, and the reporter reproduced it with plain netperf traffic. No memory-layout luck or attacker-uncontrollable state is required.\nPR:N - There is no capability check, authentication, or credential gate anywhere on the receive-and-bridge-to-tunnel path \u2014 the packet is simply forwarded and the ICMPv6 error is built. The attacker needs no account or privileges on the affected host.\nUI:N - Exploitation is entirely packet-driven and happens inside softirq/xmit context with no victim participation. No administrator or user action is needed once the standard bridged-tunnel configuration is in place.\nS:U - The out-of-bounds read and its consequences are confined to the host kernel that contains the defective checksum call. The vulnerable and impacted components are the same security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - csum_partial() reads a fixed 1240 bytes from a linear buffer that may hold only tens of bytes, overreading up to roughly a kilobyte of adjacent kernel slab memory \u2014 far beyond a \"few bytes.\" Worse, the folded result is placed in the ICMPv6 checksum field and transmitted back to the attacker, yielding a repeatable oracle over kernel heap contents that heap grooming can turn into a real disclosure.\nI:N - The defect is a read-only overrun; no kernel memory is written, no bounds are exceeded on a store, and there is no type confusion or control-flow influence. The only consequence for state is an incorrect checksum on an outgoing packet, which the receiver discards.\nA:H - Reading up to ~1KB past the end of a slab allocation can walk off the backing pages into unmapped memory, faulting in softirq context and oopsing the kernel. On KASAN or panic_on_oops/hardened kernels the access panics the machine outright, and the attacker can repeat it at will with a stream of oversized packets."
                }
              ]
            }
          ],
          "providerMetadata": {
            "dateUpdated": "2026-08-05T11:26:39.967Z",
            "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "shortName": "Linux"
          },
          "references": [
            {
              "url": "https://git.kernel.org/stable/c/e77bf828f1ca1c47fcff58bdc26b60a9d3dfbe1d"
            },
            {
              "url": "https://git.kernel.org/stable/c/d964dd1bc1452594b4207d9229c157d9386e5d8a"
            },
            {
              "url": "https://git.kernel.org/stable/c/e37cde7a5716466ff2a76f7f27f0a29b05b9a732"
            },
            {
              "url": "https://git.kernel.org/stable/c/510c869ffa4068c5f19ff4df51d1e2f3a30aaac1"
            },
            {
              "url": "https://git.kernel.org/stable/c/7dc9feb8b1705cf00de20563b6bc4831f4c99dab"
            },
            {
              "url": "https://git.kernel.org/stable/c/d75abeec401f8c86b470e7028a13fcdc87e5dd06"
            }
          ],
          "title": "tunnels: fix out of bounds access when building IPv6 PMTU error",
          "x_generator": {
            "engine": "bippy-1.2.0"
          }
        }
      },
      "cveMetadata": {
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "assignerShortName": "Linux",
        "cveId": "CVE-2024-26665",
        "datePublished": "2024-04-02T06:22:14.264Z",
        "dateReserved": "2024-02-19T14:20:24.149Z",
        "dateUpdated": "2026-08-05T11:26:39.967Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

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  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
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  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.


Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.