{"id":181735,"date":"2026-05-25T20:48:34","date_gmt":"2026-05-25T18:48:34","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/gro-frag-novaya-lpe-uyazvimost-v-setevom-steke-linux-pozvolyaet-poluchit-root"},"modified":"2026-05-25T20:48:34","modified_gmt":"2026-05-25T18:48:34","slug":"gro-frag-novaya-lpe-uyazvimost-v-setevom-steke-linux-pozvolyaet-poluchit-root","status":"publish","type":"post","link":"https:\/\/prohoster.info\/sq\/blog\/news\/gro-frag-novaya-lpe-uyazvimost-v-setevom-steke-linux-pozvolyaet-poluchit-root","title":{"rendered":"GRO Frag: nj\u00eb vulnerabilitet i ri LPE n\u00eb stek\u00ebn rrjet\u00ebrore Linux lejon marrjen e privilegjeve t\u00eb plota","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

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Nj\u00eb exploit p\u00ebr GRO Frag<\/strong> ka dal\u00eb n\u00eb dispozit\u00eb p\u00ebr nj\u00eb dob\u00ebsi lokale t\u00eb ngritjes s\u00eb privilegjeve n\u00eb b\u00ebrtham\u00ebn Linux, e lidhur me p\u00ebrpunimin GRO dhe zero-copy skb n\u00eb struktur\u00ebn e rrjetit. Data e sakt\u00eb e zbules\u00ebs fillestare n\u00eb materialet publike nuk \u00ebsht\u00eb specifikuar<\/strong>. Nga gjurm\u00ebt publike mund t\u00eb konstatohen dy data: korrigjimi \u00ebsht\u00eb diskutuar n\u00eb list\u00ebn e shp\u00ebrndarjes netdev 20 maj 2026<\/strong>, ku kjo dob\u00ebsi ishte p\u00ebrmendur si e p\u00ebrshtatshme p\u00ebr t\u00eb shkrir\u00eb cache-n e faqes, dhe nj\u00eb PoC publik ishte vendosur n\u00eb GitHub Gist<\/a> 22 maj 2026<\/strong>.<\/p>\n

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Si nj\u00eb mas\u00eb m\u00eb e p\u00ebrkohshme deri n\u00eb instalimin e b\u00ebrtham\u00ebs s\u00eb korrigjuar, mund t\u00eb kufizohet vektori i sulmit p\u00ebrmes sysctl: kernel.io_uring_disabled=1. Ky mod ndalon krijimin e kopjeve t\u00eb reja t\u00eb io_uring nga proceset e pa privilegjuar, n\u00ebse ato nuk jan\u00eb t\u00eb p\u00ebrfshira n\u00eb grupin e lejuar io_uring_group; me nj\u00eb vler\u00eb grupi -1, aksesin e ruan vet\u00ebm proceset me CAP_SYS_ADMIN. Kjo \u00ebsht\u00eb n\u00eb fakt nj\u00eb mitigim, dhe jo nj\u00eb korrigjim t\u00eb plot\u00eb t\u00eb dob\u00ebsis\u00eb.<\/p>\n

Problemi ndodhet n\u00eb funksionin skb_gro_receive(): gjat\u00eb bashkimit t\u00eb paketave GRO, b\u00ebrthama mund t\u00eb transferonte fragmente nga zero-copy skb n\u00eb nj\u00eb skb tjet\u00ebr pa verifikim t\u00eb sakt\u00eb t\u00eb gjendjes s\u00eb zero-copy dhe shenj\u00ebs SKBFL_MANAGED_FRAG_REFS. Si rezultat, faqet e memories, p\u00ebr t\u00eb cilat skb origjinal nuk mbante referenca t\u00eb ve\u00e7anta, mund t\u00eb lirohen n\u00eb m\u00ebnyr\u00eb t\u00eb pasigurt, duke \u00e7uar n\u00eb use-after-free. N\u00eb patch \u00ebsht\u00eb qart\u00eb sh\u00ebnuar se kjo situat\u00eb mund t\u00eb \u00e7oj\u00eb n\u00eb UAF, si dhe q\u00eb varianti i gjetur ishte i p\u00ebrshtatsh\u00ebm p\u00ebr t\u00eb shkrir\u00eb cache-n e faqes.<\/p>\n

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PoC e publikuar p\u00ebrshkruan dob\u00ebsin\u00eb si LPE p\u00ebrmes GRO managed-frag UAF<\/strong> duke p\u00ebrdorur io_uring SEND_ZC dhe nd\u00ebrfaqen virtuale t\u00eb rrjetit veth. N\u00eb komentet e kodit \u00ebsht\u00eb p\u00ebrmendur se jan\u00eb prekur b\u00ebrthamat Linux 6.0+<\/strong>, shfryt\u00ebzimi \u00ebsht\u00eb i mundur nga nj\u00eb p\u00ebrdorues i pa privilegjuar, por k\u00ebrkon nj\u00eb io_uring t\u00eb disponuesh\u00ebm; si nj\u00eb korrigjim \u00ebsht\u00eb em\u00ebruar komit<\/a> 4db79a322db8 me ndryshim \u00abnet: gro: don’t merge zcopy skbs\u00bb.<\/p>\n

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\n<\/p>\n

N\u00eb pasojat e GRO Frag, ajo renditet n\u00eb t\u00eb nj\u00ebjtin klas t\u00eb rreziksh\u00ebm t\u00eb gabimeve si Copy Fail dhe Dirty Frag: nj\u00eb sulmues me qasje lokale t\u00eb pa privilegjuar arrin t\u00eb ndryshoj\u00eb t\u00eb dh\u00ebnat n\u00eb cache-n e faqes, dometh\u00ebn\u00eb n\u00eb memorie, pa e modifikuar dosjen e nevojshme n\u00eb disk. K\u00ebto gabime jan\u00eb ve\u00e7an\u00ebrisht t\u00eb pak\u00ebndshme pasi prekin kufirin midis 'vet\u00ebm leximi' t\u00eb dosjes dhe p\u00ebrmbajtjes efektive q\u00eb e sheh b\u00ebrthama dhe proceset gjat\u00eb k\u00ebrkesave t\u00eb m\u00ebvonshme. Elastic kishte p\u00ebrshkruar m\u00eb par\u00eb<\/a> k\u00ebtu klas\u00ebn si nj\u00eb rrug\u00eb pragmatike p\u00ebr t\u00eb fituar root p\u00ebrmes korruptimit t\u00eb cache-n s\u00eb faqes.<\/p>\n

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N\u00eb momentin e publikimit, nj\u00eb identifikues i ve\u00e7ant\u00eb CVE p\u00ebr GRO Frag, sipas raporteve t\u00eb disponueshme, ende nuk ishte caktuar. Si masa t\u00eb p\u00ebrkohshme, administrator\u00ebt duhet t\u00eb p\u00ebrqendrohen n\u00eb azhurnimin e b\u00ebrtham\u00ebs n\u00eb versionin me rregullim, si dhe n\u00eb masat e p\u00ebrgjithshme p\u00ebr uljen e riskut p\u00ebr LPE t\u00eb tilla: kufizimi i namespace-ve t\u00eb p\u00ebrdoruesve pa privilegje atje ku \u00ebsht\u00eb e lejueshme, kontrolli i p\u00ebrdorimit t\u00eb io_uring dhe monitorimi i zinxhir\u00ebve t\u00eb dyshimt\u00eb t\u00eb lidhur me eskalimin lokal t\u00eb privilegjeve. P\u00ebr sulmet e ngjashme Copy Fail\/DirtyFrag, Elastic gjithashtu rekomandon q\u00eb patching t\u00eb kombinohet me zbulimin e primitiveve t\u00eb nivelit t\u00eb ul\u00ebt t\u00eb shfryt\u00ebzimit t\u00eb vulnerabilitetit.<\/p>\n

Primitive t\u00eb nivelit t\u00eb ul\u00ebt t\u00eb shfryt\u00ebzimit nuk jan\u00eb vet\u00eb \"k\u00ebrcimi i gatsh\u00ebm\", por teknikave t\u00eb baz\u00ebs teknike nga t\u00eb cilat nd\u00ebrtohet shfryt\u00ebzimi.<\/p>\n

N\u00eb kontekstin e GRO Frag, kjo mund t\u00eb n\u00ebnkuptoj\u00eb jo zbulimin e faktit tashm\u00eb t\u00eb gatsh\u00ebm \"korr p\u00ebrdoruesi u b\u00eb root\", por nj\u00eb p\u00ebrpjekje p\u00ebr t\u00eb v\u00ebrejtur veprime t\u00eb ve\u00e7anta t\u00eb dyshimta q\u00eb shfryt\u00ebzimi p\u00ebrdor n\u00eb rrug\u00ebn drejt rritjes s\u00eb privilegjeve.<\/p>\n

Burimi: linux.org.ru<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

\u0412 \u043e\u0442\u043a\u0440\u044b\u0442\u043e\u043c \u0434\u043e\u0441\u0442\u0443\u043f\u0435 \u043f\u043e\u044f\u0432\u0438\u043b\u0441\u044f \u044d\u043a\u0441\u043f\u043b\u043e\u0438\u0442 \u0434\u043b\u044f GRO Frag \u2014 \u043b\u043e\u043a\u0430\u043b\u044c\u043d\u043e\u0439 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0438 \u043f\u043e\u0432\u044b\u0448\u0435\u043d\u0438\u044f \u043f\u0440\u0438\u0432\u0438\u043b\u0435\u0433\u0438\u0439 \u0432 \u044f\u0434\u0440\u0435 Linux, \u0441\u0432\u044f\u0437\u0430\u043d\u043d\u043e\u0439 \u0441 \u043e\u0431\u0440\u0430\u0431\u043e\u0442\u043a\u043e\u0439 GRO \u0438 zero-copy skb \u0432 \u0441\u0435\u0442\u0435\u0432\u043e\u043c \u0441\u0442\u0435\u043a\u0435. \u0422\u043e\u0447\u043d\u0430\u044f \u0434\u0430\u0442\u0430 \u043f\u0435\u0440\u0432\u043e\u043d\u0430\u0447\u0430\u043b\u044c\u043d\u043e\u0433\u043e \u043e\u0431\u043d\u0430\u0440\u0443\u0436\u0435\u043d\u0438\u044f \u0432 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