{"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":"2026-09-08T08:46:53.748Z"},"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":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.12","versionEndExcluding":"7.0"}]}]}],"references":[{"url":"https://git.kernel.org/stable/c/96fc16370b0bceb289c7e0479bd0540b81e257aa"},{"url":"https://git.kernel.org/stable/c/798d613afb64b01a203f448fb0f43c37c6afe79d"},{"url":"https://git.kernel.org/stable/c/6e568835ea54a3e1d08e310e34f95d434e739477"},{"url":"https://git.kernel.org/stable/c/1734bd85c5e0a7a801295b729efb56b009cb8fc3"},{"url":"https://git.kernel.org/stable/c/4e2d1bcef78d21247fe8fef13bc7ed95885df2b5"},{"url":"https://git.kernel.org/stable/c/8c92969c197b91c134be27dc3afb64ab468853a9"},{"url":"https://git.kernel.org/stable/c/f953f11ccf4afe6feb635c08145f4240d9a6b544"},{"url":"https://git.kernel.org/stable/c/a1822cb524e89b4cd2cf0b82e484a2335496a6d9"}],"title":"net/x25: 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