CVE-2024-56720 (GCVE-0-2024-56720)

Vulnerability from cvelistv5 – Published: 2024-12-29 11:29 – Updated: 2026-08-05 11:46
VLAI
Title
bpf, sockmap: Several fixes to bpf_msg_pop_data
Summary
In the Linux kernel, the following vulnerability has been resolved: bpf, sockmap: Several fixes to bpf_msg_pop_data Several fixes to bpf_msg_pop_data, 1. In sk_msg_shift_left, we should put_page 2. if (len == 0), return early is better 3. pop the entire sk_msg (last == msg->sg.size) should be supported 4. Fix for the value of variable "a" 5. In sk_msg_shift_left, after shifting, i has already pointed to the next element. Addtional sk_msg_iter_var_next may result in BUG.
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
5.5 (Medium)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
  • CWE-401 - Missing Release of Memory after Effective Lifetime
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 7246d8ed4dcce23f7509949a77be15fa9f0e3d28 , < d3f5763b3062514a234114e97bbde74d8d702449 (git)
Affected: 7246d8ed4dcce23f7509949a77be15fa9f0e3d28 , < d26d977633d1d0b8bf9407278189bd0a8d973323 (git)
Affected: 7246d8ed4dcce23f7509949a77be15fa9f0e3d28 , < e1f54c61c4c9a5244eb8159dce60d248f7d97b32 (git)
Affected: 7246d8ed4dcce23f7509949a77be15fa9f0e3d28 , < f58d3aa457e77a3d9b3df2ab081dcf9950f6029f (git)
Affected: 7246d8ed4dcce23f7509949a77be15fa9f0e3d28 , < 98c7ea7d11f2588e8197db042e0291e4ac8f8346 (git)
Affected: 7246d8ed4dcce23f7509949a77be15fa9f0e3d28 , < 785180bed9879680d8e5c5e1b54c8ae8d948f4c8 (git)
Affected: 7246d8ed4dcce23f7509949a77be15fa9f0e3d28 , < 275a9f3ef8fabb0cb282a62b9e164dedba7284c5 (git)
Affected: 7246d8ed4dcce23f7509949a77be15fa9f0e3d28 , < 5d609ba262475db450ba69b8e8a557bd768ac07a (git)
Create a notification for this product.
Linux Linux Affected: 5.0
Unaffected: 0 , < 5.0 (semver)
Unaffected: 5.4.287 , ≤ 5.4.* (semver)
Unaffected: 5.10.231 , ≤ 5.10.* (semver)
Unaffected: 5.15.174 , ≤ 5.15.* (semver)
Unaffected: 6.1.120 , ≤ 6.1.* (semver)
Unaffected: 6.6.64 , ≤ 6.6.* (semver)
Unaffected: 6.11.11 , ≤ 6.11.* (semver)
Unaffected: 6.12.2 , ≤ 6.12.* (semver)
Unaffected: 6.13 , ≤ * (original_commit_for_fix)
Create a notification for this product.
Show details on NVD website
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    "microsoft_vex": {
      "current_release_date": "2025-03-08T00:00:00.000Z",
      "cve": "CVE-2024-56720",
      "id": "msrc_CVE-2024-56720",
      "initial_release_date": "2024-12-02T00:00:00.000Z",
      "product_status:fixed": "4",
      "product_status:known_affected": "4",
      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "bpf, sockmap: Several fixes to bpf_msg_pop_data",
      "url": "https://msrc.microsoft.com/csaf/vex/2024/msrc_cve-2024-56720.json",
      "version": "2"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2024-56720\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2024-12-29T12:15:06.037\",\"lastModified\":\"2026-08-04T11:22:25.153\",\"vulnStatus\":\"Modified\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nbpf, sockmap: Several fixes to bpf_msg_pop_data\\n\\nSeveral fixes to bpf_msg_pop_data,\\n1. In sk_msg_shift_left, we should put_page\\n2. if (len == 0), return early is better\\n3. pop the entire sk_msg (last == msg-\u003esg.size) should be supported\\n4. Fix for the value of variable \\\"a\\\"\\n5. In sk_msg_shift_left, after shifting, i has already pointed to the next\\nelement. Addtional sk_msg_iter_var_next may result in BUG.\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: bpf, sockmap: Varias correcciones para bpf_msg_pop_data Varias correcciones para bpf_msg_pop_data, 1. En sk_msg_shift_left, deber\u00edamos put_page 2. si (len == 0), es mejor regresar antes 3. Deber\u00eda ser compatible con la extracci\u00f3n de todo el sk_msg (last == msg-\u0026gt;sg.size) 4. Correcci\u00f3n para el valor de la variable \\\"a\\\" 5. En sk_msg_shift_left, despu\u00e9s de cambiar, i ya ha apuntado al siguiente elemento. La adici\u00f3n de sk_msg_iter_var_next puede provocar un 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    "redhat_vex": {
      "aggregate_severity": "Low",
      "current_release_date": "2026-08-04T22:39:56+00:00",
      "cve": "CVE-2024-56720",
      "id": "CVE-2024-56720",
      "initial_release_date": "2024-12-29T00:00:00+00:00",
      "product_status:known_affected": "198",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: bpf, sockmap: Several fixes to bpf_msg_pop_data",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2024/cve-2024-56720.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-07-25T01:16:14Z",
      "cve": "CVE-2024-56720",
      "id": "CVE-2024-56720",
      "initial_release_date": "2024-12-30T03:48:30Z",
      "product_status:known_affected": "652",
      "product_status:known_not_affected": "145",
      "product_status:recommended": "363",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2024-56720",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2024-56720.json",
      "version": "58"
    },
    "vulnrichment": {
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The vulnerable helper runs from `sk_psock_msg_verdict()` on the local egress path, requiring a locally loaded BPF_PROG_TYPE_SK_MSG program attached to a sockmap plus a local `sendmsg()` on a sockmap\u0027d socket; there is no remote packet path into `bpf_msg_pop_data()` since SK_MSG programs only process data the local host is sending.\\nAC:L - The bug is fully deterministic and entirely attacker-controlled \\u2014 the sender chooses the write size that splits the message across scatterlist elements (making `offset != 0`), and the BPF program chooses a `start` that lands in a later element, so `a = start` is guaranteed to exceed `sge-\u003elength` with no race, timing, or memory-layout dependency.\\nPR:L - Setting up the sockmap and SK_MSG program requires CAP_BPF and CAP_NET_ADMIN, but `bpf_token_capable()` grants these at `ns_capable()` level inside a user namespace via delegated BPF tokens, and both capabilities are routinely handed to container workloads, so an ordinary unprivileged-in-init-ns user can reach this path.\\nUI:N - No victim action is required \\u2014 the attacker loads the SK_MSG program and issues the triggering `sendmsg()` entirely on their own, with no file to open, filesystem to mount, or third party to interact with.\\nS:U - The out-of-bounds reads, heap overflow, and scatterlist-ring corruption are all confined to the kernel\u0027s own memory and the socket\u0027s psock state; no VM, IOMMU, or sandbox boundary is crossed.\\nC:H - The corrupted scatterlist entry carries an inflated `length` (up to ~4 GB after the signed-to-unsigned wrap of `b`) and an `offset` past the page, and `tcp_bpf_push()` hands those verbatim to `tcp_sendmsg_locked()` with MSG_SPLICE_PAGES, transmitting arbitrary adjacent kernel heap memory to the socket peer; the `!space` path additionally performs `memcpy(to, from, a)` reading far past the source element.\\nI:H - In the no-space branch `memcpy(to, from, a)` and `memcpy(to + a, from + a + pop, b)` write attacker-sized data past an undersized `alloc_pages()` allocation \\u2014 a controlled heap buffer overflow \\u2014 and the missing `put_page()` plus the stray `sk_msg_iter_var_next()` rotate the entire sg ring, installing stale `struct page *` values that produce refcount imbalance and use-after-free of pages.\\nA:H - A negative `b` passed to `memcpy()` as `size_t`, a scatterlist entry pointing far outside its page, and `sk_msg_shift_left()` corrupting the whole fragment ring all lead directly to kernel oops/panic, while the missing `put_page()` permanently leaks a page per popped element.\"}]}], \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"7246d8ed4dcce23f7509949a77be15fa9f0e3d28\", \"lessThan\": \"d3f5763b3062514a234114e97bbde74d8d702449\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"7246d8ed4dcce23f7509949a77be15fa9f0e3d28\", \"lessThan\": \"d26d977633d1d0b8bf9407278189bd0a8d973323\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"7246d8ed4dcce23f7509949a77be15fa9f0e3d28\", \"lessThan\": \"e1f54c61c4c9a5244eb8159dce60d248f7d97b32\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"7246d8ed4dcce23f7509949a77be15fa9f0e3d28\", \"lessThan\": \"f58d3aa457e77a3d9b3df2ab081dcf9950f6029f\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"7246d8ed4dcce23f7509949a77be15fa9f0e3d28\", \"lessThan\": \"98c7ea7d11f2588e8197db042e0291e4ac8f8346\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"7246d8ed4dcce23f7509949a77be15fa9f0e3d28\", \"lessThan\": \"785180bed9879680d8e5c5e1b54c8ae8d948f4c8\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"7246d8ed4dcce23f7509949a77be15fa9f0e3d28\", \"lessThan\": \"275a9f3ef8fabb0cb282a62b9e164dedba7284c5\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"7246d8ed4dcce23f7509949a77be15fa9f0e3d28\", \"lessThan\": \"5d609ba262475db450ba69b8e8a557bd768ac07a\", \"versionType\": \"git\"}], \"programFiles\": [\"net/core/filter.c\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"5.0\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"5.0\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"5.4.287\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.4.*\"}, {\"status\": \"unaffected\", \"version\": \"5.10.231\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.10.*\"}, {\"status\": \"unaffected\", \"version\": \"5.15.174\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.15.*\"}, {\"status\": \"unaffected\", \"version\": \"6.1.120\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.1.*\"}, {\"status\": \"unaffected\", \"version\": \"6.6.64\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.6.*\"}, {\"status\": \"unaffected\", \"version\": \"6.11.11\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.11.*\"}, {\"status\": \"unaffected\", \"version\": \"6.12.2\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.12.*\"}, {\"status\": \"unaffected\", \"version\": \"6.13\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"net/core/filter.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/d3f5763b3062514a234114e97bbde74d8d702449\"}, {\"url\": \"https://git.kernel.org/stable/c/d26d977633d1d0b8bf9407278189bd0a8d973323\"}, {\"url\": \"https://git.kernel.org/stable/c/e1f54c61c4c9a5244eb8159dce60d248f7d97b32\"}, {\"url\": \"https://git.kernel.org/stable/c/f58d3aa457e77a3d9b3df2ab081dcf9950f6029f\"}, {\"url\": \"https://git.kernel.org/stable/c/98c7ea7d11f2588e8197db042e0291e4ac8f8346\"}, {\"url\": \"https://git.kernel.org/stable/c/785180bed9879680d8e5c5e1b54c8ae8d948f4c8\"}, {\"url\": \"https://git.kernel.org/stable/c/275a9f3ef8fabb0cb282a62b9e164dedba7284c5\"}, {\"url\": \"https://git.kernel.org/stable/c/5d609ba262475db450ba69b8e8a557bd768ac07a\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\nbpf, sockmap: Several fixes to bpf_msg_pop_data\\n\\nSeveral fixes to bpf_msg_pop_data,\\n1. In sk_msg_shift_left, we should put_page\\n2. if (len == 0), return early is better\\n3. pop the entire sk_msg (last == msg-\u003esg.size) should be supported\\n4. Fix for the value of variable \\\"a\\\"\\n5. In sk_msg_shift_left, after shifting, i has already pointed to the next\\nelement. Addtional sk_msg_iter_var_next may result in BUG.\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.4.287\", \"versionStartIncluding\": \"5.0\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.231\", \"versionStartIncluding\": \"5.0\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.174\", \"versionStartIncluding\": \"5.0\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.120\", \"versionStartIncluding\": \"5.0\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6.64\", \"versionStartIncluding\": \"5.0\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.11.11\", \"versionStartIncluding\": \"5.0\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.12.2\", \"versionStartIncluding\": \"5.0\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.13\", \"versionStartIncluding\": \"5.0\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-08-05T11:46:18.145Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2024-56720\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-08-05T11:46:18.145Z\", \"dateReserved\": \"2024-12-27T15:00:39.858Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-12-29T11:29:58.345Z\", \"assignerShortName\": \"Linux\"}",
      "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

Author Source Type Date Other

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.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • 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.