CVE-2026-23459

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-23459", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-01-13T15:37:46.021Z", "datePublished": "2026-04-03T15:15:39.665Z", "dateUpdated": "2026-10-21T12:39:14.669Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-21T12:39:14.669Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nip_tunnel: adapt iptunnel_xmit_stats() to NETDEV_PCPU_STAT_DSTATS\n\nBlamed commits forgot that vxlan/geneve use udp_tunnel[6]_xmit_skb() which\ncall iptunnel_xmit_stats().\n\niptunnel_xmit_stats() was assuming tunnels were only using\nNETDEV_PCPU_STAT_TSTATS.\n\n@syncp offset in pcpu_sw_netstats and pcpu_dstats is different.\n\n32bit kernels would either have corruptions or freezes if the syncp\nsequence was overwritten.\n\nThis patch also moves pcpu_stat_type closer to dev->{t,d}stats to avoid\na potential cache line miss since iptunnel_xmit_stats() needs to read it."}], "metrics": [{"cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H", "baseScore": 8.2, "baseSeverity": "HIGH"}, "scenarios": [{"lang": "en", "value": "AV:N - An unauthenticated remote peer can trigger the affected VXLAN/Geneve tunnel transmit path by sending traffic that a configured host routes or bridges out through the tunnel. This reaches `udp_tunnel[6]_xmit_skb()` and then `iptunnel_xmit_stats()` via normal network packet forwarding/output.\nAC:L - Once an affected 32-bit VXLAN/Geneve deployment exists, triggering is just repeated packet transmission through the tunnel. There is no attacker-uncontrolled race or fragile timing requirement.\nPR:N - For an already configured tunnel endpoint, the attacker does not need local privileges or authentication to cause network traffic to traverse the vulnerable transmit path. Although creating such devices requires `CAP_NET_ADMIN`, exploitation of an existing network-facing deployment does not.\nUI:N - No victim user action is required. Packet forwarding/output and statistics updates occur automatically in the kernel.\nS:U - The vulnerable code and the resulting corruption/freeze are within the same kernel/network-device security authority. This is not a VM escape or cross-authority boundary bypass.\nC:N - The bug corrupts per-CPU tunnel statistics/synchronization state rather than exposing kernel memory. No plausible arbitrary read or information disclosure primitive is evident.\nI:L - The direct integrity impact is limited corruption of network device statistics fields due to using the wrong per-CPU stats layout. The fixed write pattern does not provide a general arbitrary write or control-flow primitive.\nA:H - On 32-bit kernels, the wrong `syncp` offset can corrupt sequence/stat state and cause freezes or repeated kernel-side stalls when stats are read. This can produce a high availability impact."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["include/linux/netdevice.h", "include/net/ip_tunnels.h"], "versions": [{"version": "1db9041e91ac574f1cecc0e98e69ac35832e8088", "lessThan": "127c5e6e2d6fa8185314537c08204ec3515eae99", "status": "affected", "versionType": "git"}, {"version": "cb1c1f3b7ef908408064734fb6bdaf5811b8b84c", "lessThan": "e40e2d11ced8119d3e4469ebe91264bc1cf71530", "status": "affected", "versionType": "git"}, {"version": "be226352e8dc77d3313c096b2d8e7f69bf6980fc", "lessThan": "5d562153b4719234227f99c2fb529f98a6a44d15", "status": "affected", "versionType": "git"}, {"version": "be226352e8dc77d3313c096b2d8e7f69bf6980fc", "lessThan": "0d087d00161f562d5047cc4009bb0c6a19daf9f1", "status": "affected", "versionType": "git"}, {"version": "be226352e8dc77d3313c096b2d8e7f69bf6980fc", "lessThan": "8431c602f551549f082bbfa67f3003f2d8e3e132", "status": "affected", "versionType": "git"}, {"version": "6.6.153", "lessThan": "6.6.160", "status": "affected", "versionType": "semver"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["include/linux/netdevice.h", "include/net/ip_tunnels.h"], "versions": [{"version": "6.14", "status": "affected"}, {"version": "0", "lessThan": "6.14", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.160", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.50", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.19.10", "lessThanOrEqual": "6.19.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.0", "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": "6.6.153", "versionEndExcluding": "6.6.160"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.14", "versionEndExcluding": "6.18.50"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.14", "versionEndExcluding": "6.19.10"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.14", "versionEndExcluding": "7.0"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/127c5e6e2d6fa8185314537c08204ec3515eae99"}, {"url": "https://git.kernel.org/stable/c/e40e2d11ced8119d3e4469ebe91264bc1cf71530"}, {"url": "https://git.kernel.org/stable/c/5d562153b4719234227f99c2fb529f98a6a44d15"}, {"url": "https://git.kernel.org/stable/c/0d087d00161f562d5047cc4009bb0c6a19daf9f1"}, {"url": "https://git.kernel.org/stable/c/8431c602f551549f082bbfa67f3003f2d8e3e132"}], "title": "ip_tunnel: adapt iptunnel_xmit_stats() to NETDEV_PCPU_STAT_DSTATS", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["include/linux/netdevice.h", "include/net/ip_tunnels.h"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "127c5e6e2d6fa8185314537c08204ec3515eae99", "status": "affected", "version": "1db9041e91ac574f1cecc0e98e69ac35832e8088", "versionType": "git"}, {"lessThan": "e40e2d11ced8119d3e4469ebe91264bc1cf71530", "status": "affected", "version": "cb1c1f3b7ef908408064734fb6bdaf5811b8b84c", "versionType": "git"}, {"lessThan": "5d562153b4719234227f99c2fb529f98a6a44d15", "status": "affected", "version": "be226352e8dc77d3313c096b2d8e7f69bf6980fc", "versionType": "git"}, {"lessThan": "0d087d00161f562d5047cc4009bb0c6a19daf9f1", "status": "affected", "version": "be226352e8dc77d3313c096b2d8e7f69bf6980fc", "versionType": "git"}, {"lessThan": "8431c602f551549f082bbfa67f3003f2d8e3e132", "status": "affected", "version": "be226352e8dc77d3313c096b2d8e7f69bf6980fc", "versionType": "git"}, {"lessThan": "6.6.160", "status": "affected", "version": "6.6.153", "versionType": "semver"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["include/linux/netdevice.h", "include/net/ip_tunnels.h"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "6.14"}, {"lessThan": "6.14", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "6.6.*", "status": "unaffected", "version": "6.6.160", "versionType": "semver"}, {"lessThanOrEqual": "6.18.*", "status": "unaffected", "version": "6.18.50", "versionType": "semver"}, {"lessThanOrEqual": "6.19.*", "status": "unaffected", "version": "6.19.10", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "7.0", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "2B2C5324-E9BD-43C2-AA70-44A311B13130", "versionEndExcluding": "6.19.10", "versionStartIncluding": "6.14", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc1:*:*:*:*:*:*", "matchCriteriaId": "F253B622-8837-4245-BCE5-A7BF8FC76A16", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc2:*:*:*:*:*:*", "matchCriteriaId": "4AE85AD8-4641-4E7C-A2F4-305E2CD9EE64", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc3:*:*:*:*:*:*", "matchCriteriaId": "F666C8D8-6538-46D4-B318-87610DE64C34", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc4:*:*:*:*:*:*", "matchCriteriaId": "02259FDA-961B-47BC-AE7F-93D7EC6E90C2", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nip_tunnel: adapt iptunnel_xmit_stats() to NETDEV_PCPU_STAT_DSTATS\n\nBlamed commits forgot that vxlan/geneve use udp_tunnel[6]_xmit_skb() which\ncall iptunnel_xmit_stats().\n\niptunnel_xmit_stats() was assuming tunnels were only using\nNETDEV_PCPU_STAT_TSTATS.\n\n@syncp offset in pcpu_sw_netstats and pcpu_dstats is different.\n\n32bit kernels would either have corruptions or freezes if the syncp\nsequence was overwritten.\n\nThis patch also moves pcpu_stat_type closer to dev->{t,d}stats to avoid\na potential cache line miss since iptunnel_xmit_stats() needs to read it."}, {"lang": "es", "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nip_tunnel: adaptar iptunnel_xmit_stats() a NETDEV_PCPU_STAT_DSTATS\n\nLos commits culpables olvidaron que vxlan/geneve usan udp_tunnel[6]_xmit_skb() que llama a iptunnel_xmit_stats().\n\niptunnel_xmit_stats() asum\u00eda que los t\u00faneles solo usaban NETDEV_PCPU_STAT_TSTATS.\n\nEl desplazamiento @syncp en pcpu_sw_netstats y pcpu_dstats es diferente.\n\nLos kernels de 32 bits tendr\u00edan o bien corrupciones o congelamientos si la secuencia syncp era sobrescrita.\n\nEste parche tambi\u00e9n mueve pcpu_stat_type m\u00e1s cerca de dev -> {t,d}stats para evitar una posible p\u00e9rdida de l\u00ednea de cach\u00e9 ya que iptunnel_xmit_stats() necesita leerlo."}], "id": "CVE-2026-23459", "lastModified": "2026-10-21T13:18:36.850", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 8.2, "baseSeverity": "HIGH", "confidentialityImpact": "NONE", "integrityImpact": "LOW", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 4.2, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}]}, "published": "2026-04-03T16:16:32.833", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/0d087d00161f562d5047cc4009bb0c6a19daf9f1"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/127c5e6e2d6fa8185314537c08204ec3515eae99"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/5d562153b4719234227f99c2fb529f98a6a44d15"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/8431c602f551549f082bbfa67f3003f2d8e3e132"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/e40e2d11ced8119d3e4469ebe91264bc1cf71530"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "NVD-CWE-noinfo"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: ip_tunnel: adapt iptunnel_xmit_stats() to NETDEV_PCPU_STAT_DSTATS", "id": "2454863", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2454863"}, "csaw": false, "cwe": "CWE-821", "details": ["A flaw was found in the Linux kernel's IP tunnel (ip_tunnel) functionality. Incorrect handling of tunnel statistics, specifically within the `iptunnel_xmit_stats()` function, could lead to a mismatch in how data is processed. On 32-bit kernel systems, this issue may result in data corruption or system freezes, effectively causing a Denial of Service (DoS)."], "name": "CVE-2026-23459", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"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": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-04-03T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-23459\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-23459\nhttps://lore.kernel.org/linux-cve-announce/2026040319-CVE-2026-23459-fcfb@gregkh/T"]}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[be226352e8dc77d3313c096b2d8e7f69bf6980fc,0d087d00161f562d5047cc4009bb0c6a19daf9f1)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[be226352e8dc77d3313c096b2d8e7f69bf6980fc,8431c602f551549f082bbfa67f3003f2d8e3e132)"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "6.14"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,6.14)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.19.10,7.0.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.0-rc5,*]"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}], "created": "2026-04-03T21:13:39.476741+00:00", "updated": "2026-05-26T15:45:08.882137+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}