{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-31417", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-03-09T15:48:24.087Z", "datePublished": "2026-04-13T13:21:04.638Z", "dateUpdated": "2026-08-05T12:22:22.177Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T12:22:22.177Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/x25: Fix overflow when accumulating packets\n\nAdd a check to ensure that `x25_sock.fraglen` does not overflow.\n\nThe `fraglen` also needs to be resetted when purging `fragment_queue` in\n`x25_clear_queues()`." } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "baseScore": 7.5, "baseSeverity": "HIGH" }, "scenarios": [ { "lang": "en", "value": "AV:N - The vulnerable path is reached by received X.25 network packets delivered through the kernel `ETH_P_X25` packet handler on an X.25 link. A remote X.25 peer can establish or use a virtual circuit and send fragmented DATA packets to the affected host.\nAC:L - The attacker only needs to send valid sequenced DATA frames with the M bit set until the 16-bit fragment length wraps, then send a final fragment. There is no race or condition outside attacker control beyond ordinary X.25 connectivity.\nPR:N - For an exposed X.25 listener, the peer reaches this kernel receive path through Call Request and DATA frames without kernel-level authentication or local privileges. Route/device setup is administrative target configuration, not an attacker privilege requirement.\nUI:N - Once the vulnerable X.25 service/link is present, exploitation is driven entirely by attacker-supplied network frames. No victim user action is required.\nS:U - The vulnerability affects the kernel networking stack and impacts the same host security authority. It is not a VM escape, IOMMU bypass, or cross-scope boundary violation.\nC:N - The overflow leads to an undersized skb reassembly allocation, but the subsequent `skb_put()` bounds check triggers `skb_over_panic()` before an out-of-bounds copy occurs. I did not find a defensible kernel memory disclosure primitive from this path.\nI:N - The reachable failure mode is a checked skb overrun panic rather than an attacker-controlled write to kernel memory. I did not find a defensible integrity-impact primitive beyond denial of service.\nA:H - A remote peer can repeatedly trigger `skb_over_panic()`/`BUG()` during fragmented packet reassembly, causing a kernel oops or panic. This is 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": [ "net/x25/x25_in.c", "net/x25/x25_subr.c" ], "versions": [ { "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "96fc16370b0bceb289c7e0479bd0540b81e257aa", "status": "affected", "versionType": "git" }, { "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "798d613afb64b01a203f448fb0f43c37c6afe79d", "status": "affected", "versionType": "git" }, { "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "6e568835ea54a3e1d08e310e34f95d434e739477", "status": "affected", "versionType": "git" }, { "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "1734bd85c5e0a7a801295b729efb56b009cb8fc3", "status": "affected", "versionType": "git" }, { "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "4e2d1bcef78d21247fe8fef13bc7ed95885df2b5", "status": "affected", "versionType": "git" }, { "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "8c92969c197b91c134be27dc3afb64ab468853a9", "status": "affected", "versionType": "git" }, { "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "f953f11ccf4afe6feb635c08145f4240d9a6b544", "status": "affected", "versionType": "git" }, { "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "a1822cb524e89b4cd2cf0b82e484a2335496a6d9", "status": "affected", "versionType": "git" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "net/x25/x25_in.c", "net/x25/x25_subr.c" ], "versions": [ { "version": "2.6.12", "status": "affected" }, { "version": "0", "lessThan": "2.6.12", "status": "unaffected", "versionType": "semver" }, { "version": "5.10.253", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.203", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.168", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.134", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.81", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.22", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.19.12", "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": "2.6.12", "versionEndExcluding": "5.10.253" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.12", "versionEndExcluding": "5.15.203" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.12", "versionEndExcluding": "6.1.168" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.12", "versionEndExcluding": "6.6.134" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.12", "versionEndExcluding": "6.12.81" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.12", "versionEndExcluding": "6.18.22" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.12", "versionEndExcluding": "6.19.12" }, { "vulnerable": true, "criteria": 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