{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-72339", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-08-09T03:40:39.920Z", "datePublished": "2026-08-15T05:55:46.480Z", "dateUpdated": "2026-08-17T05:42:57.907Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-17T05:42:57.907Z" }, "descriptions": [ { "lang": "en", "value": "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(). 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." } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "baseScore": 9.8, "baseSeverity": "CRITICAL" }, "scenarios": [ { "lang": "en", "value": "AV:N - The bug is in the qede NIC RX fastpath reached when remote Ethernet frames are received, hardware posts completion queue entries, and NAPI runs qede_poll() -> qede_rx_int() -> qede_rx_process_cqe()/qede_tpa_start() into qede_rx_build_skb() or qede_tpa_rx_build_skb().\nAC:L - An attacker can reliably trigger build_skb() NULL returns by flooding the interface with frames larger than rx_copybreak (256 bytes) to exhaust GFP_ATOMIC skb slab allocations, then the off-by-one BD consumption desynchronizes the ring without races or victim-specific state.\nPR:N - No local account, capability, or authentication is required; any unauthenticated remote host that can send IP/Ethernet traffic to a server using a Marvell/QLogic FastLinQ qede NIC can hit the vulnerable RX/TPA handlers.\nUI:N - Exploitation requires no victim interaction beyond normal network operation; packet reception, MSI-X interrupt handling, and NAPI polling process attacker-supplied frames automatically in kernel context.\nS:U - The flaw corrupts kernel heap metadata (DMA page refcounts and SLUB freelists) within the host kernel security boundary; it does not by itself cross VM, container, or IOMMU isolation boundaries.\nC:H - BD ring desynchronization corrupts DMA page reference counts and can corrupt SLUB freelists; this class of kernel heap corruption is exploitable for arbitrary kernel memory reads and information disclosure beyond a simple crash.\nI:H - SLUB freelist corruption from mismatched BD ring consumption enables arbitrary kernel memory writes and control-flow hijacking primitives, supporting local privilege escalation or arbitrary code execution in kernel context.\nA:H - Reference-count and SLUB corruption from the desynchronized BD ring can cause kernel BUG/oops/panic or a wedged RX datapath, resulting in complete loss of host availability on affected systems." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/net/ethernet/qlogic/qede/qede_fp.c" ], "versions": [ { "version": "8a8633978b842c88fbcfe00d4e5dde96048f630e", "lessThan": "ecc05d4b20220a09c9c69584fc46ca55248a374a", "status": "affected", "versionType": "git" }, { "version": "8a8633978b842c88fbcfe00d4e5dde96048f630e", "lessThan": "07be8b8adf91b7ada4c3dacce064d572a6066421", "status": "affected", "versionType": "git" }, { "version": "8a8633978b842c88fbcfe00d4e5dde96048f630e", "lessThan": "1624aa100c0b218181aa74e3696a389b509298cb", "status": "affected", "versionType": "git" }, { "version": "8a8633978b842c88fbcfe00d4e5dde96048f630e", "lessThan": "0bf78df2d3ecb1f4964ff42a7327d25845955153", "status": "affected", "versionType": "git" }, { "version": "8a8633978b842c88fbcfe00d4e5dde96048f630e", "lessThan": "814a5edac8c9fc04051808d5faaa93768e989281", "status": "affected", "versionType": "git" }, { "version": "8a8633978b842c88fbcfe00d4e5dde96048f630e", "lessThan": "b066420e57f3402a52c998678b4678252ac9bb63", "status": "affected", "versionType": "git" }, { "version": "8a8633978b842c88fbcfe00d4e5dde96048f630e", "lessThan": "982d6d6bc059c5dff37a2201c2f08c14bcfcbd20", "status": "affected", "versionType": "git" }, { "version": "8a8633978b842c88fbcfe00d4e5dde96048f630e", "lessThan": "a0a558ca7e75b49e71f8c545c30e8c005e6e4e2f", "status": "affected", "versionType": "git" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/net/ethernet/qlogic/qede/qede_fp.c" ], "versions": [ { "version": "4.18", "status": "affected" }, { "version": "0", "lessThan": "4.18", "status": "unaffected", "versionType": "semver" }, { "version": "5.10.261", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.212", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.178", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.145", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.97", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.40", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.1.5", "lessThanOrEqual": "7.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.2", "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": "4.18", "versionEndExcluding": "5.10.261" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.18", "versionEndExcluding": "5.15.212" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.18", "versionEndExcluding": "6.1.178" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.18", "versionEndExcluding": "6.6.145" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.18", "versionEndExcluding": "6.12.97" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.18", "versionEndExcluding": "6.18.40" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.18", "versionEndExcluding": "7.1.5" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.18", "versionEndExcluding": "7.2" } ] } ] } ], "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" } ], "title": "qede: fix off-by-one in BD ring consumption on build_skb failure", "x_generator": { "engine": "bippy-1.2.0" } } } }