CVE-2024-56720

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Addtional sk_msg_iter_var_next may result in BUG."}], "metrics": [{"cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "baseScore": 7.8, "baseSeverity": "HIGH"}, "scenarios": [{"lang": "en", "value": "AV:L - 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'd 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->length` 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's own memory and the socket's 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": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/core/filter.c"], "versions": [{"version": "7246d8ed4dcce23f7509949a77be15fa9f0e3d28", "lessThan": "d3f5763b3062514a234114e97bbde74d8d702449", "status": "affected", "versionType": "git"}, {"version": "7246d8ed4dcce23f7509949a77be15fa9f0e3d28", "lessThan": "d26d977633d1d0b8bf9407278189bd0a8d973323", "status": "affected", "versionType": "git"}, {"version": "7246d8ed4dcce23f7509949a77be15fa9f0e3d28", "lessThan": "e1f54c61c4c9a5244eb8159dce60d248f7d97b32", "status": "affected", "versionType": "git"}, {"version": "7246d8ed4dcce23f7509949a77be15fa9f0e3d28", "lessThan": "f58d3aa457e77a3d9b3df2ab081dcf9950f6029f", "status": "affected", "versionType": "git"}, {"version": "7246d8ed4dcce23f7509949a77be15fa9f0e3d28", "lessThan": "98c7ea7d11f2588e8197db042e0291e4ac8f8346", "status": "affected", "versionType": "git"}, {"version": "7246d8ed4dcce23f7509949a77be15fa9f0e3d28", "lessThan": "785180bed9879680d8e5c5e1b54c8ae8d948f4c8", "status": "affected", "versionType": "git"}, {"version": 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"unaffected", "versionType": "semver"}, {"version": "6.6.64", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.11.11", "lessThanOrEqual": "6.11.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.2", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.13", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix"}]}], "cpeApplicability": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.0", "versionEndExcluding": "5.4.287"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.0", "versionEndExcluding": "5.10.231"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.0", "versionEndExcluding": "5.15.174"}, {"vulnerable": 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{"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"}], "title": "bpf, sockmap: Several fixes to bpf_msg_pop_data", "x_generator": {"engine": "bippy-1.2.0"}}, "adp": [{"metrics": [{"cvssV3_1": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 5.5, "attackVector": "LOCAL", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "integrityImpact": "NONE", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "LOW", "confidentialityImpact": "NONE"}}, {"other": {"type": "ssvc", "content": {"id": "CVE-2024-56720", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2025-10-01T19:58:21.307610Z"}}}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-401", "description": "CWE-401 Missing Release of Memory after Effective Lifetime"}]}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2025-10-01T20:07:06.140Z"}}, {"title": "CVE Program Container", "references": [{"url": "https://lists.debian.org/debian-lts-announce/2025/03/msg00001.html"}, {"url": "https://lists.debian.org/debian-lts-announce/2025/03/msg00002.html"}], "providerMetadata": {"orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2025-11-03T20:53:12.383Z"}}]}}

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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->length` 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's own memory and the socket's 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->sg.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. 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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->sg.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->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 ERROR."}], "id": "CVE-2024-56720", "lastModified": "2026-08-04T11:22:25.153", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 5.9, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}, {"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 5.5, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 3.6, "source": "nvd@nist.gov", "type": "Primary"}, {"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 5.5, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 3.6, "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2024-56720", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2025-10-01T19:58:21.307610Z", "version": "2.0.3"}}]}, "published": "2024-12-29T12:15:06.037", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/275a9f3ef8fabb0cb282a62b9e164dedba7284c5"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/5d609ba262475db450ba69b8e8a557bd768ac07a"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/785180bed9879680d8e5c5e1b54c8ae8d948f4c8"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/98c7ea7d11f2588e8197db042e0291e4ac8f8346"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/d26d977633d1d0b8bf9407278189bd0a8d973323"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/d3f5763b3062514a234114e97bbde74d8d702449"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/e1f54c61c4c9a5244eb8159dce60d248f7d97b32"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/f58d3aa457e77a3d9b3df2ab081dcf9950f6029f"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "url": "https://lists.debian.org/debian-lts-announce/2025/03/msg00001.html"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "url": "https://lists.debian.org/debian-lts-announce/2025/03/msg00002.html"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-193"}, {"lang": "en", "value": "CWE-401"}], "source": "nvd@nist.gov", "type": "Primary"}, {"description": [{"lang": "en", "value": "CWE-401"}], "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}]}

{"bugzilla": {"description": "kernel: bpf, sockmap: Several fixes to bpf_msg_pop_data", "id": "2334811", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2334811"}, "csaw": false, "cvss3": {"cvss3_base_score": "4.4", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-401", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nbpf, sockmap: Several fixes to bpf_msg_pop_data\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->sg.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."], "name": "CVE-2024-56720", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Out of support scope", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Out of support scope", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2024-12-29T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2024-56720\nhttps://nvd.nist.gov/vuln/detail/CVE-2024-56720\nhttps://lore.kernel.org/linux-cve-announce/2024122920-CVE-2024-56720-614a@gregkh/T"], "statement": "The default Red Hat Enterprise Linux kernel prevents unprivileged users from being able to use eBPF by the kernel.unprivileged_bpf_disabled sysctl. This would require a privileged user with CAP_SYS_ADMIN or root to be able to abuse this flaw reducing its attack space.\nFor the Red Hat Enterprise Linux 9 to confirm the current state, inspect the sysctl with the command:\ncat /proc/sys/kernel/unprivileged_bpf_disabled\nThe setting of 1 would mean that unprivileged users can not use eBPF, mitigating the flaw.", "threat_severity": "Low"}

{}