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| "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet_sched: hfsc: Fix a UAF vulnerability in class with netem as child qdisc\n\nAs described in Gerrard's report [1], we have a UAF case when an hfsc class\nhas a netem child qdisc. The crux of the issue is that hfsc is assuming\nthat checking for cl->qdisc->q.qlen == 0 guarantees that it hasn't inserted\nthe class in the vttree or eltree (which is not true for the netem\nduplicate case).\n\nThis patch checks the n_active class variable to make sure that the code\nwon't insert the class in the vttree or eltree twice, catering for the\nreentrant case.\n\n[1] https://lore.kernel.org/netdev/CAHcdcOm+03OD2j6R0=YHKqmy=VgJ8xEOKuP6c7mSgnp-TEJJbw@mail.gmail.com/" |
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| "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", |
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| "programFiles": [ |
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| "status": "unaffected", |
| "versionType": "semver" |
| }, |
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| "versionType": "semver" |
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| "version": "6.12.28", |
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| }, |
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| "version": "6.14.6", |
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| "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", |
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| "references": [ |
| { |
| "url": "https://git.kernel.org/stable/c/273bbcfa53541cde38b2003ad88a59b770306421" |
| }, |
| { |
| "url": "https://git.kernel.org/stable/c/e0cf8ee23e1915431f262a7b2dee0c7a7d699af0" |
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| { |
| "url": "https://git.kernel.org/stable/c/e3e949a39a91d1f829a4890e7dfe9417ac72e4d0" |
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| { |
| "url": "https://git.kernel.org/stable/c/8df7d37d626430035b413b97cee18396b3450bef" |
| }, |
| { |
| "url": "https://git.kernel.org/stable/c/6082a87af4c52f58150d40dec1716011d871ac21" |
| }, |
| { |
| "url": "https://git.kernel.org/stable/c/2e7093c7a8aba5d4f8809f271488e5babe75e202" |
| }, |
| { |
| "url": "https://git.kernel.org/stable/c/ac39fd4a757584d78ed062d4f6fd913f83bd98b5" |
| }, |
| { |
| "url": "https://git.kernel.org/stable/c/141d34391abbb315d68556b7c67ad97885407547" |
| } |
| ], |
| "title": "net_sched: hfsc: Fix a UAF vulnerability in class with netem as child qdisc", |
| "x_generator": { |
| "engine": "bippy-1.2.0" |
| } |
| } |
| }, |
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| "cveID": "CVE-2025-37890", |
| "requesterUserId": "gregkh@kernel.org", |
| "serial": "1", |
| "state": "PUBLISHED" |
| }, |
| "dataType": "CVE_RECORD", |
| "dataVersion": "5.0" |
| } |
