{"id":"CVE-2026-72297","state":"PUBLISHED","title":"net: atm: reject out-of-range traffic classes in QoS validation","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet: atm: reject out-of-range traffic classes in QoS validation\n\nReject ATM traffic classes above ATM_ANYCLASS in check_tp().\nSO_ATMQOS stores the supplied QoS after check_qos() succeeds, so\naccepting larger values leaves invalid traffic_class values in\nvcc->qos.\n\nThat bad state later reaches pvc_info(), which indexes class_name[]\nwith vcc->qos.{rx,tp}.traffic_class. Values above ATM_ANYCLASS cause\nan out-of-bounds read when /proc/net/atm/pvc is read.\n\nTighten the existing QoS validation so invalid traffic_class values\nare rejected at the point where user supplied QoS is accepted.","publishedAt":"2026-08-15T05:55:17.877Z","updatedAt":"2026-10-16T18:55:15.534Z","severity":{"score":7.1,"label":"High","version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H","source":"Linux"},"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","status":"affected","lessThan":"1a6dda72455b399ce9c1a12695471dc4d5c61add","versionType":"git"},{"version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","status":"affected","lessThan":"2b3e241729e87afed13ac0f666472d5d6ca42e87","versionType":"git"},{"version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","status":"affected","lessThan":"367acd288bc6255e247cb1a1efbf5c6567cab423","versionType":"git"},{"version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","status":"affected","lessThan":"513f820b3f0cf4462e17d84c39ed3948d061a6ea","versionType":"git"},{"version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","status":"affected","lessThan":"15444b57fdc6fc3f3e22a87f791ae5be81e6ecf5","versionType":"git"},{"version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","status":"affected","lessThan":"e62adb157c2eaad9ad4867ec6cd9af5b9a51b1c7","versionType":"git"},{"version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","status":"affected","lessThan":"806b7b6edc8446e8b94b706807a7090a14d47b5c","versionType":"git"},{"version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","status":"affected","lessThan":"cdf19f380e46192e7084be559638aab1f6ed86a2","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/atm/common.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"2.6.12","status":"affected"},{"version":"0","status":"unaffected","lessThan":"2.6.12","versionType":"semver"},{"version":"5.10.261","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.212","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.178","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.145","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.97","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.40","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.1.5","status":"unaffected","lessThanOrEqual":"7.1.*","versionType":"semver"},{"version":"7.2","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/atm/common.c"]}],"references":["https://git.kernel.org/stable/c/1a6dda72455b399ce9c1a12695471dc4d5c61add","https://git.kernel.org/stable/c/2b3e241729e87afed13ac0f666472d5d6ca42e87","https://git.kernel.org/stable/c/367acd288bc6255e247cb1a1efbf5c6567cab423","https://git.kernel.org/stable/c/513f820b3f0cf4462e17d84c39ed3948d061a6ea","https://git.kernel.org/stable/c/15444b57fdc6fc3f3e22a87f791ae5be81e6ecf5","https://git.kernel.org/stable/c/e62adb157c2eaad9ad4867ec6cd9af5b9a51b1c7","https://git.kernel.org/stable/c/806b7b6edc8446e8b94b706807a7090a14d47b5c","https://git.kernel.org/stable/c/cdf19f380e46192e7084be559638aab1f6ed86a2"],"weaknesses":[],"ingestedAt":"2026-10-29T20:12:58.252Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/72xxx/CVE-2026-72297.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-72297","state":"PUBLISHED","datePublished":"2026-08-15T05:55:17.877Z","dateUpdated":"2026-10-16T18:55:15.534Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-08-09T03:40:39.917Z"},"containers":{"cna":{"title":"net: atm: reject out-of-range traffic classes in QoS validation","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet: atm: reject out-of-range traffic classes in QoS validation\n\nReject ATM traffic classes above ATM_ANYCLASS in check_tp().\nSO_ATMQOS stores the supplied QoS after check_qos() succeeds, so\naccepting larger values leaves invalid traffic_class values in\nvcc->qos.\n\nThat bad state later reaches pvc_info(), which indexes class_name[]\nwith vcc->qos.{rx,tp}.traffic_class. Values above ATM_ANYCLASS cause\nan out-of-bounds read when /proc/net/atm/pvc is read.\n\nTighten the existing QoS validation so invalid traffic_class values\nare rejected at the point where user supplied QoS is accepted."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","status":"affected","lessThan":"1a6dda72455b399ce9c1a12695471dc4d5c61add","versionType":"git"},{"version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","status":"affected","lessThan":"2b3e241729e87afed13ac0f666472d5d6ca42e87","versionType":"git"},{"version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","status":"affected","lessThan":"367acd288bc6255e247cb1a1efbf5c6567cab423","versionType":"git"},{"version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","status":"affected","lessThan":"513f820b3f0cf4462e17d84c39ed3948d061a6ea","versionType":"git"},{"version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","status":"affected","lessThan":"15444b57fdc6fc3f3e22a87f791ae5be81e6ecf5","versionType":"git"},{"version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","status":"affected","lessThan":"e62adb157c2eaad9ad4867ec6cd9af5b9a51b1c7","versionType":"git"},{"version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","status":"affected","lessThan":"806b7b6edc8446e8b94b706807a7090a14d47b5c","versionType":"git"},{"version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","status":"affected","lessThan":"cdf19f380e46192e7084be559638aab1f6ed86a2","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/atm/common.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"2.6.12","status":"affected"},{"version":"0","status":"unaffected","lessThan":"2.6.12","versionType":"semver"},{"version":"5.10.261","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.212","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.178","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.145","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.97","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.40","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.1.5","status":"unaffected","lessThanOrEqual":"7.1.*","versionType":"semver"},{"version":"7.2","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/atm/common.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/1a6dda72455b399ce9c1a12695471dc4d5c61add"},{"url":"https://git.kernel.org/stable/c/2b3e241729e87afed13ac0f666472d5d6ca42e87"},{"url":"https://git.kernel.org/stable/c/367acd288bc6255e247cb1a1efbf5c6567cab423"},{"url":"https://git.kernel.org/stable/c/513f820b3f0cf4462e17d84c39ed3948d061a6ea"},{"url":"https://git.kernel.org/stable/c/15444b57fdc6fc3f3e22a87f791ae5be81e6ecf5"},{"url":"https://git.kernel.org/stable/c/e62adb157c2eaad9ad4867ec6cd9af5b9a51b1c7"},{"url":"https://git.kernel.org/stable/c/806b7b6edc8446e8b94b706807a7090a14d47b5c"},{"url":"https://git.kernel.org/stable/c/cdf19f380e46192e7084be559638aab1f6ed86a2"}],"metrics":[{"cvssV3_1":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H","baseScore":7.1,"baseSeverity":"HIGH"},"scenarios":[{"lang":"en","value":"AV:L - Exploitation requires local setsockopt(SO_ATMQOS) on an AF_ATMPVC socket and reading /proc/net/atm/pvc; no remote network packet or protocol handler reaches check_tp() or pvc_info().\nAC:L - On systems with an existing ATM PVC device, an attacker deterministically sets an out-of-range traffic_class via SO_ATMQOS before connect and triggers the OOB read by reading /proc/net/atm/pvc with no race or special memory layout needed.\nPR:L - No capability check guards SO_ATMQOS on unconnected sockets; any unprivileged local user in init_net can create AF_ATMPVC sockets (module autoloadable) and read world-readable /proc/net/atm/pvc without CAP_NET_ADMIN.\nUI:N - The attacker controls both poisoning vcc->qos via setsockopt and triggering pvc_info() by reading procfs; no victim action or cooperation is required.\nS:U - Impact is kernel memory disclosure within the host kernel security boundary; no VM escape, IOMMU bypass, or sandbox boundary crossing occurs.\nC:H - Out-of-bounds indexing of class_name[] loads adjacent kernel pointers that seq_printf() dereferences with %s, disclosing kernel memory contents into the procfs read buffer visible to the attacker.\nI:N - The flaw is an out-of-bounds read of static pointer tables with no memory corruption, arbitrary write, or control-flow hijack primitive; kernel or user data integrity is not modified.\nA:H - Dereferencing attacker-influenced out-of-bounds pointers via %s can fault on unmappable addresses and oops the kernel; even without reliable crash, OOB kernel reads carry high availability risk per conservative scoring."}]}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-08-17T05:42:30.264Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.12","versionEndExcluding":"5.10.261"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.12","versionEndExcluding":"5.15.212"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.12","versionEndExcluding":"6.1.178"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.12","versionEndExcluding":"6.6.145"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.12","versionEndExcluding":"6.12.97"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.12","versionEndExcluding":"6.18.40"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.12","versionEndExcluding":"7.1.5"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.12","versionEndExcluding":"7.2"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"id":"CVE-2026-72297","role":"CISA Coordinator","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"version":"2.0.3","timestamp":"2026-10-16T18:45:57.327476Z"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-10-16T18:55:15.534Z"}}]}}}