{"id":"CVE-2026-31535","title":"smb: client: make use of smbdirect_socket.recv_io.credits.available","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nsmb: client: make use of smbdirect_socket.recv_io.credits.available\n\nThe logic off managing recv credits by counting posted recv_io and\ngranted credits is racy.\n\nThat's…","severity":"none","vendor":"Linux","product":"Linux","affected":["Linux >= 5fb9b459b3686e366640edd4e62805ef7b4de927 < f664e6e8a81103cb45c8802a9bc7499e0902c458","Linux >= 5fb9b459b3686e366640edd4e62805ef7b4de927 < be8845ad5d6558703d20567d8702155598325db8","Linux >= 5fb9b459b3686e366640edd4e62805ef7b4de927 < 9911b1ed187a770a43950bf51f340ad4b7beecba","Linux 6.18"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"partial","timestamp":"2026-11-05T21:37:58.578551Z"},"published":"2026-04-24","updated":"2026-11-05","sourceUpdated":"2026-11-05T21:45:06.795Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-31535","references":[{"url":"https://git.kernel.org/stable/c/f664e6e8a81103cb45c8802a9bc7499e0902c458"},{"url":"https://git.kernel.org/stable/c/be8845ad5d6558703d20567d8702155598325db8"},{"url":"https://git.kernel.org/stable/c/9911b1ed187a770a43950bf51f340ad4b7beecba"}],"tags":["cve.org"],"epss":0.00088,"epssPercentile":0.00355,"ingestedAt":"2026-11-05T23:41:31.972Z","slug":"CVE-2026-31535","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nsmb: client: make use of smbdirect_socket.recv_io.credits.available\n\nThe logic off managing recv credits by counting posted recv_io and\ngranted credits is racy.\n\nThat's because the peer might already consumed a credit,\nbut between receiving the incoming recv at the hardware\nand processing the completion in the 'recv_done' functions\nwe likely have a window where we grant credits, which\ndon't really exist.\n\nSo we better have a decicated counter for the\navailable credits, which will be incremented\nwhen we posted new recv buffers and drained when\nwe grant the credits to the peer.\n\n## Affected\n\n- `Linux >= 5fb9b459b3686e366640edd4e62805ef7b4de927 < f664e6e8a81103cb45c8802a9bc7499e0902c458`\n- `Linux >= 5fb9b459b3686e366640edd4e62805ef7b4de927 < be8845ad5d6558703d20567d8702155598325db8`\n- `Linux >= 5fb9b459b3686e366640edd4e62805ef7b4de927 < 9911b1ed187a770a43950bf51f340ad4b7beecba`\n- `Linux 6.18`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":3,"depthScoreParts":{"impact":2.8,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}