{"id":"CVE-2026-53079","state":"PUBLISHED","title":"net_sched: fix skb memory leak in deferred qdisc drops","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet_sched: fix skb memory leak in deferred qdisc drops\n\nWhen the network stack cleans up the deferred list via qdisc_run_end(),\nit operates on the root qdisc. If the root qdisc do not implement the\nTCQ_F_DEQUEUE_DROPS flag the packets queue to free are never freed and\ngets stranded on the child's local to_free list.\n\nFix this by making qdisc_dequeue_drop() aware of the root qdisc. It\nfetches the root qdisc and check for the TCQ_F_DEQUEUE_DROPS flag. If\nthe flag is present, the packet is appended directly to the root's\nto_free list. Otherwise, drop it directly as it was done before the\noptimization was implemented.","publishedAt":"2026-06-24T16:30:20.163Z","updatedAt":"2026-06-24T16:30:20.163Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"a6efc273ab8245722eee2150fa12cf75781dc410","status":"affected","lessThan":"bf26ad92ffda7884825d67b46bd5efe615c3babf","versionType":"git"},{"version":"a6efc273ab8245722eee2150fa12cf75781dc410","status":"affected","lessThan":"a6bd339dbb3514bce690fdcf252e788dfab4ee76","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["include/net/sch_generic.h"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"6.19","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.19","versionType":"semver"},{"version":"7.0.10","status":"unaffected","lessThanOrEqual":"7.0.*","versionType":"semver"},{"version":"7.1","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["include/net/sch_generic.h"]}],"references":["https://git.kernel.org/stable/c/bf26ad92ffda7884825d67b46bd5efe615c3babf","https://git.kernel.org/stable/c/a6bd339dbb3514bce690fdcf252e788dfab4ee76"],"weaknesses":[],"ingestedAt":"2026-10-29T20:12:16.098Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/53xxx/CVE-2026-53079.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-53079","state":"PUBLISHED","datePublished":"2026-06-24T16:30:20.163Z","dateUpdated":"2026-06-24T16:30:20.163Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-06-09T07:44:35.383Z"},"containers":{"cna":{"title":"net_sched: fix skb memory leak in deferred qdisc drops","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet_sched: fix skb memory leak in deferred qdisc drops\n\nWhen the network stack cleans up the deferred list via qdisc_run_end(),\nit operates on the root qdisc. If the root qdisc do not implement the\nTCQ_F_DEQUEUE_DROPS flag the packets queue to free are never freed and\ngets stranded on the child's local to_free list.\n\nFix this by making qdisc_dequeue_drop() aware of the root qdisc. It\nfetches the root qdisc and check for the TCQ_F_DEQUEUE_DROPS flag. If\nthe flag is present, the packet is appended directly to the root's\nto_free list. Otherwise, drop it directly as it was done before the\noptimization was implemented."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"a6efc273ab8245722eee2150fa12cf75781dc410","status":"affected","lessThan":"bf26ad92ffda7884825d67b46bd5efe615c3babf","versionType":"git"},{"version":"a6efc273ab8245722eee2150fa12cf75781dc410","status":"affected","lessThan":"a6bd339dbb3514bce690fdcf252e788dfab4ee76","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["include/net/sch_generic.h"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"6.19","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.19","versionType":"semver"},{"version":"7.0.10","status":"unaffected","lessThanOrEqual":"7.0.*","versionType":"semver"},{"version":"7.1","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["include/net/sch_generic.h"]}],"references":[{"url":"https://git.kernel.org/stable/c/bf26ad92ffda7884825d67b46bd5efe615c3babf"},{"url":"https://git.kernel.org/stable/c/a6bd339dbb3514bce690fdcf252e788dfab4ee76"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-06-24T16:30:20.163Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.19","versionEndExcluding":"7.0.10"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.19","versionEndExcluding":"7.1"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}