{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-72297","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","state":"PUBLISHED","assignerShortName":"Linux","dateReserved":"2026-08-09T03:40:39.917Z","datePublished":"2026-08-15T05:55:17.877Z","dateUpdated":"2026-08-17T05:42:30.264Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2026-08-17T05:42:30.264Z"},"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."}],"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."}]}],"affected":[{"product":"Linux","vendor":"Linux","defaultStatus":"unaffected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/atm/common.c"],"versions":[{"version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","lessThan":"1a6dda72455b399ce9c1a12695471dc4d5c61add","status":"affected","versionType":"git"},{"version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","lessThan":"2b3e241729e87afed13ac0f666472d5d6ca42e87","status":"affected","versionType":"git"},{"version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","lessThan":"367acd288bc6255e247cb1a1efbf5c6567cab423","status":"affected","versionType":"git"},{"version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","lessThan":"513f820b3f0cf4462e17d84c39ed3948d061a6ea","status":"affected","versionType":"git"},{"version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","lessThan":"15444b57fdc6fc3f3e22a87f791ae5be81e6ecf5","status":"affected","versionType":"git"},{"version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","lessThan":"e62adb157c2eaad9ad4867ec6cd9af5b9a51b1c7","status":"affected","versionType":"git"},{"version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","lessThan":"806b7b6edc8446e8b94b706807a7090a14d47b5c","status":"affected","versionType":"git"},{"version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","lessThan":"cdf19f380e46192e7084be559638aab1f6ed86a2","status":"affected","versionType":"git"}]},{"product":"Linux","vendor":"Linux","defaultStatus":"affected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/atm/common.c"],"versions":[{"version":"2.6.12","status":"affected"},{"version":"0","lessThan":"2.6.12","status":"unaffected","versionType":"semver"},{"version":"5.10.261","lessThanOrEqual":"5.10.*","status":"unaffected","versionType":"semver"},{"version":"5.15.212","lessThanOrEqual":"5.15.*","status":"unaffected","versionType":"semver"},{"version":"6.1.178","lessThanOrEqual":"6.1.*","status":"unaffected","versionType":"semver"},{"version":"6.6.145","lessThanOrEqual":"6.6.*","status":"unaffected","versionType":"semver"},{"version":"6.12.97","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":"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"}]}]}],"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"}],"title":"net: atm: reject out-of-range traffic classes in QoS validation","x_generator":{"engine":"bippy-1.2.0"}}}}