{"id":"CVE-2026-31616","state":"PUBLISHED","title":"usb: gadget: f_phonet: fix skb frags[] overflow in pn_rx_complete()","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nusb: gadget: f_phonet: fix skb frags[] overflow in pn_rx_complete()\n\nA broken/bored/mean USB host can overflow the skb_shared_info->frags[]\narray on a Linux gadget exposing a Phonet function by sending an\nunbounded sequence of full-page OUT transfers.\n\npn_rx_complete() finalizes the skb only when req->actual < req->length,\nwhere req->length is set to PAGE_SIZE by the gadget.  If the host always\nsends exactly PAGE_SIZE bytes per transfer, fp->rx.skb will never be\nreset and each completion will add another fragment via\nskb_add_rx_frag().  Once nr_frags exceeds MAX_SKB_FRAGS (default 17),\nsubsequent frag stores overwrite memory adjacent to the shinfo on the\nheap.\n\nDrop the skb and account a length error when the frag limit is reached,\nmatching the fix applied in t7xx by commit f0813bcd2d9d (\"net: wwan:\nt7xx: fix potential skb->frags overflow in RX path\").","publishedAt":"2026-04-24T14:42:35.480Z","updatedAt":"2026-06-14T17:43:01.212Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"b91cd1440870f7a0649e570498b7b93caf9f781c","status":"affected","lessThan":"3d7f7e0c842242878c24b2facff8d6eda23ee1e9","versionType":"git"},{"version":"b91cd1440870f7a0649e570498b7b93caf9f781c","status":"affected","lessThan":"b5ec49fa198bd08967a3102bd41f53ccadce72c9","versionType":"git"},{"version":"b91cd1440870f7a0649e570498b7b93caf9f781c","status":"affected","lessThan":"7424f0287da73d3d8c5fa5e9d25d26fce762708e","versionType":"git"},{"version":"b91cd1440870f7a0649e570498b7b93caf9f781c","status":"affected","lessThan":"9ceff1251904901b0b4e5fe6350fcaffa368ce83","versionType":"git"},{"version":"b91cd1440870f7a0649e570498b7b93caf9f781c","status":"affected","lessThan":"c9315ce9da3632c591666a29de82d3e92d46bec1","versionType":"git"},{"version":"b91cd1440870f7a0649e570498b7b93caf9f781c","status":"affected","lessThan":"4e476c25bfcab0535ba7c76a903ae77ca8747711","versionType":"git"},{"version":"b91cd1440870f7a0649e570498b7b93caf9f781c","status":"affected","lessThan":"bd44ce09b9b569f49ed13e2d87d23d853fc7d6a7","versionType":"git"},{"version":"b91cd1440870f7a0649e570498b7b93caf9f781c","status":"affected","lessThan":"66f7471c4042e4eb300e30b5b9d87d1406862673","versionType":"git"},{"version":"b91cd1440870f7a0649e570498b7b93caf9f781c","status":"affected","lessThan":"c088d5dd2fffb4de1fb8e7f57751c8b82942180a","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/usb/gadget/function/f_phonet.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"2.6.32","status":"affected"},{"version":"0","status":"unaffected","lessThan":"2.6.32","versionType":"semver"},{"version":"5.10.258","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.209","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.175","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.136","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.83","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.24","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"6.19.14","status":"unaffected","lessThanOrEqual":"6.19.*","versionType":"semver"},{"version":"7.0.1","status":"unaffected","lessThanOrEqual":"7.0.*","versionType":"semver"},{"version":"7.1","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/usb/gadget/function/f_phonet.c"]}],"references":["https://git.kernel.org/stable/c/3d7f7e0c842242878c24b2facff8d6eda23ee1e9","https://git.kernel.org/stable/c/b5ec49fa198bd08967a3102bd41f53ccadce72c9","https://git.kernel.org/stable/c/7424f0287da73d3d8c5fa5e9d25d26fce762708e","https://git.kernel.org/stable/c/9ceff1251904901b0b4e5fe6350fcaffa368ce83","https://git.kernel.org/stable/c/c9315ce9da3632c591666a29de82d3e92d46bec1","https://git.kernel.org/stable/c/4e476c25bfcab0535ba7c76a903ae77ca8747711","https://git.kernel.org/stable/c/bd44ce09b9b569f49ed13e2d87d23d853fc7d6a7","https://git.kernel.org/stable/c/66f7471c4042e4eb300e30b5b9d87d1406862673","https://git.kernel.org/stable/c/c088d5dd2fffb4de1fb8e7f57751c8b82942180a"],"weaknesses":[],"ingestedAt":"2026-10-29T20:11:40.391Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/31xxx/CVE-2026-31616.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-31616","state":"PUBLISHED","datePublished":"2026-04-24T14:42:35.480Z","dateUpdated":"2026-06-14T17:43:01.212Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-03-09T15:48:24.123Z"},"containers":{"cna":{"title":"usb: gadget: f_phonet: fix skb frags[] overflow in pn_rx_complete()","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nusb: gadget: f_phonet: fix skb frags[] overflow in pn_rx_complete()\n\nA broken/bored/mean USB host can overflow the skb_shared_info->frags[]\narray on a Linux gadget exposing a Phonet function by sending an\nunbounded sequence of full-page OUT transfers.\n\npn_rx_complete() finalizes the skb only when req->actual < req->length,\nwhere req->length is set to PAGE_SIZE by the gadget.  If the host always\nsends exactly PAGE_SIZE bytes per transfer, fp->rx.skb will never be\nreset and each completion will add another fragment via\nskb_add_rx_frag().  Once nr_frags exceeds MAX_SKB_FRAGS (default 17),\nsubsequent frag stores overwrite memory adjacent to the shinfo on the\nheap.\n\nDrop the skb and account a length error when the frag limit is reached,\nmatching the fix applied in t7xx by commit f0813bcd2d9d (\"net: wwan:\nt7xx: fix potential skb->frags overflow in RX path\")."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"b91cd1440870f7a0649e570498b7b93caf9f781c","status":"affected","lessThan":"3d7f7e0c842242878c24b2facff8d6eda23ee1e9","versionType":"git"},{"version":"b91cd1440870f7a0649e570498b7b93caf9f781c","status":"affected","lessThan":"b5ec49fa198bd08967a3102bd41f53ccadce72c9","versionType":"git"},{"version":"b91cd1440870f7a0649e570498b7b93caf9f781c","status":"affected","lessThan":"7424f0287da73d3d8c5fa5e9d25d26fce762708e","versionType":"git"},{"version":"b91cd1440870f7a0649e570498b7b93caf9f781c","status":"affected","lessThan":"9ceff1251904901b0b4e5fe6350fcaffa368ce83","versionType":"git"},{"version":"b91cd1440870f7a0649e570498b7b93caf9f781c","status":"affected","lessThan":"c9315ce9da3632c591666a29de82d3e92d46bec1","versionType":"git"},{"version":"b91cd1440870f7a0649e570498b7b93caf9f781c","status":"affected","lessThan":"4e476c25bfcab0535ba7c76a903ae77ca8747711","versionType":"git"},{"version":"b91cd1440870f7a0649e570498b7b93caf9f781c","status":"affected","lessThan":"bd44ce09b9b569f49ed13e2d87d23d853fc7d6a7","versionType":"git"},{"version":"b91cd1440870f7a0649e570498b7b93caf9f781c","status":"affected","lessThan":"66f7471c4042e4eb300e30b5b9d87d1406862673","versionType":"git"},{"version":"b91cd1440870f7a0649e570498b7b93caf9f781c","status":"affected","lessThan":"c088d5dd2fffb4de1fb8e7f57751c8b82942180a","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/usb/gadget/function/f_phonet.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"2.6.32","status":"affected"},{"version":"0","status":"unaffected","lessThan":"2.6.32","versionType":"semver"},{"version":"5.10.258","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.209","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.175","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.136","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.83","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.24","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"6.19.14","status":"unaffected","lessThanOrEqual":"6.19.*","versionType":"semver"},{"version":"7.0.1","status":"unaffected","lessThanOrEqual":"7.0.*","versionType":"semver"},{"version":"7.1","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/usb/gadget/function/f_phonet.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/3d7f7e0c842242878c24b2facff8d6eda23ee1e9"},{"url":"https://git.kernel.org/stable/c/b5ec49fa198bd08967a3102bd41f53ccadce72c9"},{"url":"https://git.kernel.org/stable/c/7424f0287da73d3d8c5fa5e9d25d26fce762708e"},{"url":"https://git.kernel.org/stable/c/9ceff1251904901b0b4e5fe6350fcaffa368ce83"},{"url":"https://git.kernel.org/stable/c/c9315ce9da3632c591666a29de82d3e92d46bec1"},{"url":"https://git.kernel.org/stable/c/4e476c25bfcab0535ba7c76a903ae77ca8747711"},{"url":"https://git.kernel.org/stable/c/bd44ce09b9b569f49ed13e2d87d23d853fc7d6a7"},{"url":"https://git.kernel.org/stable/c/66f7471c4042e4eb300e30b5b9d87d1406862673"},{"url":"https://git.kernel.org/stable/c/c088d5dd2fffb4de1fb8e7f57751c8b82942180a"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-06-14T17:43:01.212Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.32","versionEndExcluding":"5.10.258"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.32","versionEndExcluding":"5.15.209"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.32","versionEndExcluding":"6.1.175"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.32","versionEndExcluding":"6.6.136"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.32","versionEndExcluding":"6.12.83"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.32","versionEndExcluding":"6.18.24"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.32","versionEndExcluding":"6.19.14"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.32","versionEndExcluding":"7.0.1"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.32","versionEndExcluding":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