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| { |
| "lang": "en", |
| "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet_sched: hfsc: Fix a UAF vulnerability in class handling\n\nThis patch fixes a Use-After-Free vulnerability in the HFSC qdisc class\nhandling. The issue occurs due to a time-of-check/time-of-use condition\nin hfsc_change_class() when working with certain child qdiscs like netem\nor codel.\n\nThe vulnerability works as follows:\n1. hfsc_change_class() checks if a class has packets (q.qlen != 0)\n2. It then calls qdisc_peek_len(), which for certain qdiscs (e.g.,\n codel, netem) might drop packets and empty the queue\n3. The code continues assuming the queue is still non-empty, adding\n the class to vttree\n4. This breaks HFSC scheduler assumptions that only non-empty classes\n are in vttree\n5. Later, when the class is destroyed, this can lead to a Use-After-Free\n\nThe fix adds a second queue length check after qdisc_peek_len() to verify\nthe queue wasn't emptied." |
| } |
| ], |
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| "vendor": "Linux", |
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| "defaultStatus": "affected", |
| "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", |
| "programFiles": [ |
| "net/sched/sch_hfsc.c" |
| ], |
| "versions": [ |
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| "status": "affected" |
| }, |
| { |
| "version": "0", |
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| "status": "unaffected", |
| "versionType": "semver" |
| }, |
| { |
| "version": "5.4.293", |
| "lessThanOrEqual": "5.4.*", |
| "status": "unaffected", |
| "versionType": "semver" |
| }, |
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| "version": "5.10.237", |
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| "status": "unaffected", |
| "versionType": "semver" |
| }, |
| { |
| "version": "5.15.181", |
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| "status": "unaffected", |
| "versionType": "semver" |
| }, |
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| "version": "6.1.136", |
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| "versionType": "semver" |
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| "status": "unaffected", |
| "versionType": "semver" |
| }, |
| { |
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| "lessThanOrEqual": "6.12.*", |
| "status": "unaffected", |
| "versionType": "semver" |
| }, |
| { |
| "version": "6.14.5", |
| "lessThanOrEqual": "6.14.*", |
| "status": "unaffected", |
| "versionType": "semver" |
| }, |
| { |
| "version": "6.15", |
| "lessThanOrEqual": "*", |
| "status": "unaffected", |
| "versionType": "original_commit_for_fix" |
| } |
| ] |
| } |
| ], |
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| "nodes": [ |
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| "operator": "OR", |
| "negate": false, |
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| "references": [ |
| { |
| "url": "https://git.kernel.org/stable/c/28b09a067831f7317c3841812276022d6c940677" |
| }, |
| { |
| "url": "https://git.kernel.org/stable/c/39b9095dd3b55d9b2743df038c32138efa34a9de" |
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| { |
| "url": "https://git.kernel.org/stable/c/fcc8ede663569c704fb00a702973bd6c00373283" |
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| "url": "https://git.kernel.org/stable/c/20d584a33e480ae80d105f43e0e7b56784da41b9" |
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| { |
| "url": "https://git.kernel.org/stable/c/3aa852e3605000d5c47035c3fc3a986d14ccfa9f" |
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| "url": "https://git.kernel.org/stable/c/86cd4641c713455a4f1c8e54c370c598c2b1cee0" |
| }, |
| { |
| "url": "https://git.kernel.org/stable/c/bb583c88d23b72d8d16453d24856c99bd93dadf5" |
| }, |
| { |
| "url": "https://git.kernel.org/stable/c/3df275ef0a6ae181e8428a6589ef5d5231e58b5c" |
| } |
| ], |
| "title": "net_sched: hfsc: Fix a UAF vulnerability in class handling", |
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| "engine": "bippy-1.2.0" |
| } |
| } |
| }, |
| "cveMetadata": { |
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| "cveID": "CVE-2025-37797", |
| "requesterUserId": "gregkh@kernel.org", |
| "serial": "1", |
| "state": "PUBLISHED" |
| }, |
| "dataType": "CVE_RECORD", |
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| } |
