{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-72032", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-08-09T03:40:39.901Z", "datePublished": "2026-08-15T05:51:54.461Z", "dateUpdated": "2026-08-17T05:06:57.395Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-17T05:06:57.395Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/mlx5: HWS, fix matcher leak on resize target setup failure\n\nhws_bwc_matcher_move() allocates a replacement matcher before setting it\nas the resize target. If mlx5hws_matcher_resize_set_target() fails, the\nreplacement matcher is not attached anywhere and is leaked.\n\nFix the leak by destroying the replacement matcher before returning from\nthe resize-target failure path.\n\nThe bug was first flagged by an experimental analysis tool we are\ndeveloping for kernel memory-management bugs while analyzing\nv6.13-rc1. The tool is still under development and is not yet publicly\navailable. Manual inspection confirms that the bug is still\npresent in v7.1.1.\n\nAn x86_64 allyesconfig build showed no new warnings. As we do not have a\nmlx5 HWS-capable device to test with, no runtime testing was able to be\nperformed."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/net/ethernet/mellanox/mlx5/core/steering/hws/bwc.c"], "versions": [{"version": "2111bb970c787b16b002dc726c1d296ce87a00fb", "lessThan": "a751ccdc6ea9bde154f25a5ba66926f462f96c19", "status": "affected", "versionType": "git"}, {"version": "2111bb970c787b16b002dc726c1d296ce87a00fb", "lessThan": "1dce4f4bb3c1c02080b1a45bdd2abb2913a6642a", "status": "affected", "versionType": "git"}, {"version": "2111bb970c787b16b002dc726c1d296ce87a00fb", "lessThan": "ae0265f0a95aaacef59d560a3e1ea36db8be9a52", "status": "affected", "versionType": "git"}, {"version": "2111bb970c787b16b002dc726c1d296ce87a00fb", "lessThan": "bb09d0e64ecaa0aa0f7d1133a1696ed74dead295", "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/mellanox/mlx5/core/steering/hws/bwc.c"], "versions": [{"version": "6.12", "status": "affected"}, {"version": "0", "lessThan": "6.12", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.101", "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": "6.12", "versionEndExcluding": "6.12.101"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.12", "versionEndExcluding": "6.18.40"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.12", "versionEndExcluding": "7.1.5"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.12", "versionEndExcluding": "7.2"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/a751ccdc6ea9bde154f25a5ba66926f462f96c19"}, {"url": "https://git.kernel.org/stable/c/1dce4f4bb3c1c02080b1a45bdd2abb2913a6642a"}, {"url": "https://git.kernel.org/stable/c/ae0265f0a95aaacef59d560a3e1ea36db8be9a52"}, {"url": "https://git.kernel.org/stable/c/bb09d0e64ecaa0aa0f7d1133a1696ed74dead295"}], "title": "net/mlx5: HWS, fix matcher leak on resize target setup failure", "x_generator": {"engine": "bippy-1.2.0"}}}}

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{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["drivers/net/ethernet/mellanox/mlx5/core/steering/hws/bwc.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "a751ccdc6ea9bde154f25a5ba66926f462f96c19", "status": "affected", "version": "2111bb970c787b16b002dc726c1d296ce87a00fb", "versionType": "git"}, {"lessThan": "1dce4f4bb3c1c02080b1a45bdd2abb2913a6642a", "status": "affected", "version": "2111bb970c787b16b002dc726c1d296ce87a00fb", "versionType": "git"}, {"lessThan": "ae0265f0a95aaacef59d560a3e1ea36db8be9a52", "status": "affected", "version": "2111bb970c787b16b002dc726c1d296ce87a00fb", "versionType": "git"}, {"lessThan": "bb09d0e64ecaa0aa0f7d1133a1696ed74dead295", "status": "affected", "version": "2111bb970c787b16b002dc726c1d296ce87a00fb", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["drivers/net/ethernet/mellanox/mlx5/core/steering/hws/bwc.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "6.12"}, {"lessThan": "6.12", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "6.12.*", "status": "unaffected", "version": "6.12.101", "versionType": "semver"}, {"lessThanOrEqual": "6.18.*", "status": "unaffected", "version": "6.18.40", "versionType": "semver"}, {"lessThanOrEqual": "7.1.*", "status": "unaffected", "version": "7.1.5", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "7.2", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/mlx5: HWS, fix matcher leak on resize target setup failure\n\nhws_bwc_matcher_move() allocates a replacement matcher before setting it\nas the resize target. If mlx5hws_matcher_resize_set_target() fails, the\nreplacement matcher is not attached anywhere and is leaked.\n\nFix the leak by destroying the replacement matcher before returning from\nthe resize-target failure path.\n\nThe bug was first flagged by an experimental analysis tool we are\ndeveloping for kernel memory-management bugs while analyzing\nv6.13-rc1. The tool is still under development and is not yet publicly\navailable. Manual inspection confirms that the bug is still\npresent in v7.1.1.\n\nAn x86_64 allyesconfig build showed no new warnings. As we do not have a\nmlx5 HWS-capable device to test with, no runtime testing was able to be\nperformed."}], "id": "CVE-2026-72032", "lastModified": "2026-08-17T06:18:00.970", "metrics": {}, "published": "2026-08-15T06:21:12.143", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/1dce4f4bb3c1c02080b1a45bdd2abb2913a6642a"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/a751ccdc6ea9bde154f25a5ba66926f462f96c19"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/ae0265f0a95aaacef59d560a3e1ea36db8be9a52"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/bb09d0e64ecaa0aa0f7d1133a1696ed74dead295"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{"bugzilla": {"description": "kernel: net/mlx5: HWS, fix matcher leak on resize target setup failure", "id": "2516265", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2516265"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.5", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-772", "details": ["A flaw was found in the Linux kernel's net/mlx5 HWS (Hardware Steering) component. This vulnerability occurs when the hws_bwc_matcher_move() function attempts to resize a matcher, and the mlx5hws_matcher_resize_set_target() operation fails. In such a scenario, a replacement matcher is allocated but not properly deallocated, leading to a memory leak. Over time, repeated occurrences of this flaw could potentially lead to a Denial of Service (DoS) due to resource exhaustion."], "name": "CVE-2026-72032", "public_date": "2026-08-15T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-72032\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-72032\nhttps://lore.kernel.org/linux-cve-announce/2026081512-CVE-2026-72032-bc57@gregkh/T"], "threat_severity": "Low"}