CVE-2026-64550 (GCVE-0-2026-64550)

Vulnerability from cvelistv5 – Published: 2026-07-27 20:10 – Updated: 2026-07-27 20:10
VLAI
Title
net: qualcomm: rmnet: validate MAP frame length before ingress parsing
Summary
In the Linux kernel, the following vulnerability has been resolved: net: qualcomm: rmnet: validate MAP frame length before ingress parsing When ingress deaggregation is disabled, rmnet_map_ingress_handler() passes the skb straight to __rmnet_map_ingress_handler(), skipping the length validation that rmnet_map_deaggregate() performs on the aggregated path. The parser then dereferences the MAP header and csum header/trailer based on the on-wire pkt_len without checking skb->len, so a short frame is read out of bounds: BUG: KASAN: slab-out-of-bounds in rmnet_map_checksum_downlink_packet Read of size 1 at addr ffff88801118ed00 by task exploit/147 Call Trace: ... rmnet_map_checksum_downlink_packet (drivers/net/ethernet/qualcomm/rmnet/rmnet_map_data.c:413) __rmnet_map_ingress_handler (drivers/net/ethernet/qualcomm/rmnet/rmnet_handlers.c:96) rmnet_rx_handler (drivers/net/ethernet/qualcomm/rmnet/rmnet_handlers.c:129) __netif_receive_skb_core.constprop.0 (net/core/dev.c:6089) netif_receive_skb (net/core/dev.c:6460) tun_get_user (drivers/net/tun.c:1955) tun_chr_write_iter (drivers/net/tun.c:2001) vfs_write (fs/read_write.c:688) ksys_write (fs/read_write.c:740) do_syscall_64 (arch/x86/entry/syscall_64.c:94) ... Factor that validation out of rmnet_map_deaggregate() into rmnet_map_validate_packet_len() and run it on the no-aggregation path too. The MAP header is bounds-checked first, since this path can receive a frame shorter than the header.
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: ceed73a2cf4aff2921802aa3d21d45280677547d , < ed25befc8c36f896b5878f9078faddb67fd7e2d0 (git)
Affected: ceed73a2cf4aff2921802aa3d21d45280677547d , < a54d76d176e50d2fdbd39b7231efe256170339e4 (git)
Affected: ceed73a2cf4aff2921802aa3d21d45280677547d , < 00f4c366dbca16a40772c3b7ec2d8cba839e9724 (git)
Affected: ceed73a2cf4aff2921802aa3d21d45280677547d , < 3868c3244369ab709a90c9aad7534d406009b824 (git)
Affected: ceed73a2cf4aff2921802aa3d21d45280677547d , < 14eb0c9491385d5361a292ea4974aec0e6887299 (git)
Affected: ceed73a2cf4aff2921802aa3d21d45280677547d , < 1b12612c367e4be9b0814c0468e7e687835315b4 (git)
Affected: ceed73a2cf4aff2921802aa3d21d45280677547d , < 231a8a4b76cb1b1827b3b19d7b3603642f5aaaef (git)
Affected: ceed73a2cf4aff2921802aa3d21d45280677547d , < f0f1887a9e30712a1df03e152dce6fb91344b1f3 (git)
Create a notification for this product.
Linux Linux Affected: 4.14
Unaffected: 0 , < 4.14 (semver)
Unaffected: 5.10.261 , ≤ 5.10.* (semver)
Unaffected: 5.15.212 , ≤ 5.15.* (semver)
Unaffected: 6.1.178 , ≤ 6.1.* (semver)
Unaffected: 6.6.145 , ≤ 6.6.* (semver)
Unaffected: 6.12.97 , ≤ 6.12.* (semver)
Unaffected: 6.18.40 , ≤ 6.18.* (semver)
Unaffected: 7.1.5 , ≤ 7.1.* (semver)
Unaffected: 7.2-rc3 , ≤ * (original_commit_for_fix)
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{
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      "descriptions": [
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          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: qualcomm: rmnet: validate MAP frame length before ingress parsing\n\nWhen ingress deaggregation is disabled, rmnet_map_ingress_handler() passes\nthe skb straight to __rmnet_map_ingress_handler(), skipping the length\nvalidation that rmnet_map_deaggregate() performs on the aggregated path.\nThe parser then dereferences the MAP header and csum header/trailer based on\nthe on-wire pkt_len without checking skb-\u003elen, so a short frame is read out\nof bounds:\n\n  BUG: KASAN: slab-out-of-bounds in rmnet_map_checksum_downlink_packet\n  Read of size 1 at addr ffff88801118ed00 by task exploit/147\n  Call Trace:\n   ...\n   rmnet_map_checksum_downlink_packet (drivers/net/ethernet/qualcomm/rmnet/rmnet_map_data.c:413)\n   __rmnet_map_ingress_handler (drivers/net/ethernet/qualcomm/rmnet/rmnet_handlers.c:96)\n   rmnet_rx_handler (drivers/net/ethernet/qualcomm/rmnet/rmnet_handlers.c:129)\n   __netif_receive_skb_core.constprop.0 (net/core/dev.c:6089)\n   netif_receive_skb (net/core/dev.c:6460)\n   tun_get_user (drivers/net/tun.c:1955)\n   tun_chr_write_iter (drivers/net/tun.c:2001)\n   vfs_write (fs/read_write.c:688)\n   ksys_write (fs/read_write.c:740)\n   do_syscall_64 (arch/x86/entry/syscall_64.c:94)\n   ...\n\nFactor that validation out of rmnet_map_deaggregate() into\nrmnet_map_validate_packet_len() and run it on the no-aggregation path too.\nThe MAP header is bounds-checked first, since this path can receive a frame\nshorter than the header."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-07-27T20:10:39.459Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/ed25befc8c36f896b5878f9078faddb67fd7e2d0"
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          "url": "https://git.kernel.org/stable/c/a54d76d176e50d2fdbd39b7231efe256170339e4"
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        },
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          "url": "https://git.kernel.org/stable/c/3868c3244369ab709a90c9aad7534d406009b824"
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          "url": "https://git.kernel.org/stable/c/14eb0c9491385d5361a292ea4974aec0e6887299"
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        {
          "url": "https://git.kernel.org/stable/c/f0f1887a9e30712a1df03e152dce6fb91344b1f3"
        }
      ],
      "title": "net: qualcomm: rmnet: validate MAP frame length before ingress parsing",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-64550",
    "datePublished": "2026-07-27T20:10:39.459Z",
    "dateReserved": "2026-07-19T15:36:31.796Z",
    "dateUpdated": "2026-07-27T20:10:39.459Z",
    "state": "PUBLISHED"
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...\\n   rmnet_map_checksum_downlink_packet (drivers/net/ethernet/qualcomm/rmnet/rmnet_map_data.c:413)\\n   __rmnet_map_ingress_handler (drivers/net/ethernet/qualcomm/rmnet/rmnet_handlers.c:96)\\n   rmnet_rx_handler (drivers/net/ethernet/qualcomm/rmnet/rmnet_handlers.c:129)\\n   __netif_receive_skb_core.constprop.0 (net/core/dev.c:6089)\\n   netif_receive_skb (net/core/dev.c:6460)\\n   tun_get_user (drivers/net/tun.c:1955)\\n   tun_chr_write_iter (drivers/net/tun.c:2001)\\n   vfs_write (fs/read_write.c:688)\\n   ksys_write (fs/read_write.c:740)\\n   do_syscall_64 (arch/x86/entry/syscall_64.c:94)\\n   ...\\n\\nFactor that validation out of rmnet_map_deaggregate() into\\nrmnet_map_validate_packet_len() and run it on the no-aggregation path too.\\nThe MAP header is bounds-checked first, since this path can receive a frame\\nshorter than the header.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"drivers/net/ethernet/qualcomm/rmnet/rmnet_handlers.c\",\"drivers/net/ethernet/qualcomm/rmnet/rmnet_map.h\",\"drivers/net/ethernet/qualcomm/rmnet/rmnet_map_data.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"ceed73a2cf4aff2921802aa3d21d45280677547d\",\"lessThan\":\"ed25befc8c36f896b5878f9078faddb67fd7e2d0\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"ceed73a2cf4aff2921802aa3d21d45280677547d\",\"lessThan\":\"a54d76d176e50d2fdbd39b7231efe256170339e4\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"ceed73a2cf4aff2921802aa3d21d45280677547d\",\"lessThan\":\"00f4c366dbca16a40772c3b7ec2d8cba839e9724\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"ceed73a2cf4aff2921802aa3d21d45280677547d\",\"lessThan\":\"3868c3244369ab709a90c9aad7534d406009b824\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"ceed73a2cf4aff2921802aa3d21d45280677547d\",\"lessThan\":\"14eb0c9491385d5361a292ea4974aec0e6887299\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"ceed73a2cf4aff2921802aa3d21d45280677547d\",\"lessThan\":\"1b12612c367e4be9b0814c0468e7e687835315b4\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"ceed73a2cf4aff2921802aa3d21d45280677547d\",\"lessThan\":\"231a8a4b76cb1b1827b3b19d7b3603642f5aaaef\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"ceed73a2cf4aff2921802aa3d21d45280677547d\",\"lessThan\":\"f0f1887a9e30712a1df03e152dce6fb91344b1f3\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"drivers/net/ethernet/qualcomm/rmnet/rmnet_handlers.c\",\"drivers/net/ethernet/qualcomm/rmnet/rmnet_map.h\",\"drivers/net/ethernet/qualcomm/rmnet/rmnet_map_data.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"4.14\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"4.14\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.261\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.212\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.178\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.145\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.97\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.40\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1.5\",\"lessThanOrEqual\":\"7.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.2-rc3\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/00f4c366dbca16a40772c3b7ec2d8cba839e9724\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/14eb0c9491385d5361a292ea4974aec0e6887299\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/1b12612c367e4be9b0814c0468e7e687835315b4\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/231a8a4b76cb1b1827b3b19d7b3603642f5aaaef\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/3868c3244369ab709a90c9aad7534d406009b824\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/a54d76d176e50d2fdbd39b7231efe256170339e4\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/ed25befc8c36f896b5878f9078faddb67fd7e2d0\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/f0f1887a9e30712a1df03e152dce6fb91344b1f3\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}



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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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Nomenclature

  • 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.
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  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • 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.