CVE-2024-26665

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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's 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."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/ipv4/ip_tunnel_core.c"], "versions": [{"version": "4cb47a8644cc9eb8ec81190a50e79e6530d0297f", "lessThan": "e77bf828f1ca1c47fcff58bdc26b60a9d3dfbe1d", "status": "affected", "versionType": "git"}, {"version": "4cb47a8644cc9eb8ec81190a50e79e6530d0297f", "lessThan": "d964dd1bc1452594b4207d9229c157d9386e5d8a", "status": "affected", "versionType": "git"}, {"version": "4cb47a8644cc9eb8ec81190a50e79e6530d0297f", "lessThan": "e37cde7a5716466ff2a76f7f27f0a29b05b9a732", "status": "affected", "versionType": "git"}, {"version": "4cb47a8644cc9eb8ec81190a50e79e6530d0297f", "lessThan": "510c869ffa4068c5f19ff4df51d1e2f3a30aaac1", "status": "affected", 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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's 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."}]}], "affected": [{"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "4cb47a8644cc9eb8ec81190a50e79e6530d0297f", "lessThan": "e77bf828f1ca1c47fcff58bdc26b60a9d3dfbe1d", "versionType": "git"}, {"status": "affected", "version": "4cb47a8644cc9eb8ec81190a50e79e6530d0297f", "lessThan": "d964dd1bc1452594b4207d9229c157d9386e5d8a", "versionType": "git"}, {"status": "affected", "version": "4cb47a8644cc9eb8ec81190a50e79e6530d0297f", "lessThan": "e37cde7a5716466ff2a76f7f27f0a29b05b9a732", "versionType": "git"}, {"status": "affected", "version": "4cb47a8644cc9eb8ec81190a50e79e6530d0297f", "lessThan": "510c869ffa4068c5f19ff4df51d1e2f3a30aaac1", "versionType": "git"}, {"status": "affected", "version": 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"versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "6.8", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "393FFD59-45A0-4C2A-A547-8B90CE3BBAA1", "versionEndExcluding": "5.10.210", "versionStartIncluding": "5.9", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "0D0465BB-4053-4E15-9137-6696EBAE90FD", "versionEndExcluding": "5.15.149", "versionStartIncluding": "5.11", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "26190115-BC0C-4106-9408-E7928FE5DA62", "versionEndExcluding": "6.1.78", "versionStartIncluding": "5.16", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "73F8C6ED-5A0B-4B25-8FA9-AF916A9C8F0B", "versionEndExcluding": "6.6.17", "versionStartIncluding": "6.2", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "01925741-2C95-47C1-A7EA-3DC2BB0012D3", "versionEndExcluding": "6.7.5", "versionStartIncluding": "6.7", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.8:rc1:*:*:*:*:*:*", "matchCriteriaId": "B9F4EA73-0894-400F-A490-3A397AB7A517", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.8:rc2:*:*:*:*:*:*", "matchCriteriaId": "056BD938-0A27-4569-B391-30578B309EE3", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.8:rc3:*:*:*:*:*:*", "matchCriteriaId": "F02056A5-B362-4370-9FF8-6F0BD384D520", "vulnerable": true}], "negate": false, "operator": "OR"}]}, {"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*", "matchCriteriaId": "07B237A9-69A3-4A9C-9DA0-4E06BD37AE73", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"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."}, {"lang": "es", "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."}], "id": "CVE-2024-26665", "lastModified": "2026-08-04T11:16:55.497", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 9.1, "baseSeverity": "CRITICAL", "confidentialityImpact": "HIGH", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 5.2, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}, {"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.1, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 5.2, "source": "nvd@nist.gov", "type": "Primary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2024-26665", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2024-09-10T15:53:43.558193Z", "version": "2.0.3"}}]}, "published": "2024-04-02T07:15:43.430", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/510c869ffa4068c5f19ff4df51d1e2f3a30aaac1"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/7dc9feb8b1705cf00de20563b6bc4831f4c99dab"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/d75abeec401f8c86b470e7028a13fcdc87e5dd06"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/d964dd1bc1452594b4207d9229c157d9386e5d8a"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/e37cde7a5716466ff2a76f7f27f0a29b05b9a732"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/e77bf828f1ca1c47fcff58bdc26b60a9d3dfbe1d"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/510c869ffa4068c5f19ff4df51d1e2f3a30aaac1"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/7dc9feb8b1705cf00de20563b6bc4831f4c99dab"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/d75abeec401f8c86b470e7028a13fcdc87e5dd06"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/d964dd1bc1452594b4207d9229c157d9386e5d8a"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/e37cde7a5716466ff2a76f7f27f0a29b05b9a732"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/e77bf828f1ca1c47fcff58bdc26b60a9d3dfbe1d"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Mailing List"], "url": "https://lists.debian.org/debian-lts-announce/2024/06/msg00017.html"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-125"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"affected_release": [{"advisory": "RHSA-2024:7001", "cpe": "cpe:/a:redhat:enterprise_linux:8::nfv", "package": "kernel-rt-0:4.18.0-553.22.1.rt7.363.el8_10", "product_name": "Red Hat Enterprise Linux 8", "release_date": "2024-09-24T00:00:00Z"}, {"advisory": "RHSA-2024:7000", "cpe": "cpe:/o:redhat:enterprise_linux:8", "package": "kernel-0:4.18.0-553.22.1.el8_10", "product_name": "Red Hat Enterprise Linux 8", "release_date": "2024-09-24T00:00:00Z"}, {"advisory": "RHSA-2024:6993", "cpe": "cpe:/o:redhat:rhel_eus:8.8", "package": "kernel-0:4.18.0-477.74.1.el8_8", "product_name": "Red Hat Enterprise Linux 8.8 Extended Update Support", "release_date": "2024-09-24T00:00:00Z"}], "bugzilla": {"description": "kernel: tunnels: fix out of bounds access when building IPv6 PMTU error", "id": "2272793", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2272793"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.1", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H", "status": "verified"}, "cwe": "CWE-125", "details": ["In the Linux kernel, the following vulnerability has been resolved:\ntunnels: fix out of bounds access when building IPv6 PMTU error\nIf the ICMPv6 error is built from a non-linear skb we get the following\nsplat,\nBUG: KASAN: slab-out-of-bounds in do_csum+0x220/0x240\nRead of size 4 at addr ffff88811d402c80 by task netperf/820\nCPU: 0 PID: 820 Comm: netperf Not tainted 6.8.0-rc1+ #543\n...\nkasan_report+0xd8/0x110\ndo_csum+0x220/0x240\ncsum_partial+0xc/0x20\nskb_tunnel_check_pmtu+0xeb9/0x3280\nvxlan_xmit_one+0x14c2/0x4080\nvxlan_xmit+0xf61/0x5c00\ndev_hard_start_xmit+0xfb/0x510\n__dev_queue_xmit+0x7cd/0x32a0\nbr_dev_queue_push_xmit+0x39d/0x6a0\nUse skb_checksum instead of csum_partial who cannot deal with non-linear\nSKBs.", "A flaw was found in the Linux kernel. This issue occurs due to the improper handling of non-linear skbs (socket buffers) when calculating checksums for ICMPv6 PMTU error messages. This vulnerability can lead to out-of-bounds access, potentially causing memory corruption or crashes."], "name": "CVE-2024-26665", "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:9", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2024-04-02T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2024-26665\nhttps://nvd.nist.gov/vuln/detail/CVE-2024-26665\nhttps://lore.kernel.org/linux-cve-announce/2024040224-CVE-2024-26665-5daa@gregkh/T"], "statement": "Red Hat Enterprise Linux 9 is not affected by this vulnerability, as it was already patched in the 9.4.0 release.", "threat_severity": "Moderate"}

{}