{ "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": "2026-09-07T15:44:49.978Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-09-07T15:44:49.978Z" }, "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": "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": "1db9041e91ac574f1cecc0e98e69ac35832e8088", "status": "affected", "versionType": "git" }, { "version": "6.6.153", "lessThan": "6.7", "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": "6.18.50", "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": "6.14", "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" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.6.153" } ] } ] } ], "references": [ { "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" } } } }