{"id":"CVE-2026-72339","title":"qede: fix off-by-one in BD ring consumption on build_skb failure","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nqede: fix off-by-one in BD ring consumption on build_skb failure\n\nqede_rx_build_skb() and qede_tpa_rx_build_skb() do not check for a\nNULL return from qede_build_skb(). …","severity":"critical","cvss":9.8,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","cvssSource":"cna","vendor":"Linux","product":"Linux","affected":["Linux >= 8a8633978b842c88fbcfe00d4e5dde96048f630e < ecc05d4b20220a09c9c69584fc46ca55248a374a","Linux >= 8a8633978b842c88fbcfe00d4e5dde96048f630e < 07be8b8adf91b7ada4c3dacce064d572a6066421","Linux >= 8a8633978b842c88fbcfe00d4e5dde96048f630e < 1624aa100c0b218181aa74e3696a389b509298cb","Linux >= 8a8633978b842c88fbcfe00d4e5dde96048f630e < 0bf78df2d3ecb1f4964ff42a7327d25845955153","Linux >= 8a8633978b842c88fbcfe00d4e5dde96048f630e < 814a5edac8c9fc04051808d5faaa93768e989281","Linux >= 8a8633978b842c88fbcfe00d4e5dde96048f630e < b066420e57f3402a52c998678b4678252ac9bb63","Linux >= 8a8633978b842c88fbcfe00d4e5dde96048f630e < 982d6d6bc059c5dff37a2201c2f08c14bcfcbd20","Linux >= 8a8633978b842c88fbcfe00d4e5dde96048f630e < a0a558ca7e75b49e71f8c545c30e8c005e6e4e2f","Linux 4.18"],"ssvc":{"exploitation":"none","automatable":"yes","technicalImpact":"total","timestamp":"2026-10-16T18:47:21.272710Z"},"published":"2026-08-15","updated":"2026-10-16","sourceUpdated":"2026-10-16T18:55:18.961Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-72339","references":[{"url":"https://git.kernel.org/stable/c/ecc05d4b20220a09c9c69584fc46ca55248a374a"},{"url":"https://git.kernel.org/stable/c/07be8b8adf91b7ada4c3dacce064d572a6066421"},{"url":"https://git.kernel.org/stable/c/1624aa100c0b218181aa74e3696a389b509298cb"},{"url":"https://git.kernel.org/stable/c/0bf78df2d3ecb1f4964ff42a7327d25845955153"},{"url":"https://git.kernel.org/stable/c/814a5edac8c9fc04051808d5faaa93768e989281"},{"url":"https://git.kernel.org/stable/c/b066420e57f3402a52c998678b4678252ac9bb63"},{"url":"https://git.kernel.org/stable/c/982d6d6bc059c5dff37a2201c2f08c14bcfcbd20"},{"url":"https://git.kernel.org/stable/c/a0a558ca7e75b49e71f8c545c30e8c005e6e4e2f"}],"tags":["cve.org"],"epss":0.00745,"epssPercentile":0.53884,"ingestedAt":"2026-10-16T19:46:24.405Z","slug":"CVE-2026-72339","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nqede: fix off-by-one in BD ring consumption on build_skb failure\n\nqede_rx_build_skb() and qede_tpa_rx_build_skb() do not check for a\nNULL return from qede_build_skb(). When it returns NULL under memory\npressure, the functions still consume a BD from the ring before\nreturning NULL. The callers then recycle additional BDs, resulting in\none extra BD being consumed (off-by-one). This desynchronizes the BD\nring, which can corrupt DMA page reference counts and lead to SLUB\nfreelist corruption.\n\nCommit 4e910dbe3650 (\"qede: confirm skb is allocated before using\")\nadded a NULL check inside qede_build_skb() to prevent a NULL pointer\ndereference, but did not address the missing NULL checks in the\ncallers, making this off-by-one reachable.\n\nFix this by adding NULL checks for the return value of\nqede_build_skb() in both qede_rx_build_skb() and\nqede_tpa_rx_build_skb(), returning NULL immediately before any BD ring\nmanipulation.\n\n## Affected\n\n- `Linux >= 8a8633978b842c88fbcfe00d4e5dde96048f630e < ecc05d4b20220a09c9c69584fc46ca55248a374a`\n- `Linux >= 8a8633978b842c88fbcfe00d4e5dde96048f630e < 07be8b8adf91b7ada4c3dacce064d572a6066421`\n- `Linux >= 8a8633978b842c88fbcfe00d4e5dde96048f630e < 1624aa100c0b218181aa74e3696a389b509298cb`\n- `Linux >= 8a8633978b842c88fbcfe00d4e5dde96048f630e < 0bf78df2d3ecb1f4964ff42a7327d25845955153`\n- `Linux >= 8a8633978b842c88fbcfe00d4e5dde96048f630e < 814a5edac8c9fc04051808d5faaa93768e989281`\n- `Linux >= 8a8633978b842c88fbcfe00d4e5dde96048f630e < b066420e57f3402a52c998678b4678252ac9bb63`\n- `Linux >= 8a8633978b842c88fbcfe00d4e5dde96048f630e < 982d6d6bc059c5dff37a2201c2f08c14bcfcbd20`\n- `Linux >= 8a8633978b842c88fbcfe00d4e5dde96048f630e < a0a558ca7e75b49e71f8c545c30e8c005e6e4e2f`\n- `Linux 4.18`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"midnight","depthScore":54,"depthScoreParts":{"impact":53.9,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}