{"api_version":"1","generated_at":"2026-06-26T22:15:03+00:00","cve":"CVE-2026-53304","urls":{"html":"https://cve.report/CVE-2026-53304","api":"https://cve.report/api/cve/CVE-2026-53304.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-53304","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-53304"},"summary":{"title":"scsi: sg: Resolve soft lockup issue when opening /dev/sgX","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nscsi: sg: Resolve soft lockup issue when opening /dev/sgX\n\nThe parameter def_reserved_size defines the default buffer size reserved\nfor each Sg_fd and should be restricted to a range between 0 and 1,048,576\n(see https://tldp.org/HOWTO/SCSI-Generic-HOWTO/proc.html).  Although the\nfunction sg_proc_write_dressz enforces this limit, it is possible to bypass\nit by directly modifying the module parameter as shown below, which then\ncauses a soft lockup:\n\necho -1 > /sys/module/sg/parameters/def_reserved_size\nexec 4<> /dev/sg0\n\nwatchdog: BUG: soft lockup - CPU#5 stuck for 26 seconds! [bash:537]\nModules loaded:\nCPU: 5 UID: 0 PID: 537 Command: bash, kernel version 6.19.0-rc3+ #134,\nPREEMPT disabled\nHardware: QEMU Standard PC (i440FX + PIIX, 1996), BIOS version\n1.16.1-2.fc37 dated 04/01/2014\n...\nCall Trace:\n\n  sg_build_reserve+0x5c/0xa0\n  sg_add_sfp+0x168/0x270\n  sg_open+0x16e/0x340\n  chrdev_open+0xbe/0x230\n  do_dentry_open+0x175/0x480\n  vfs_open+0x34/0xf0\n  do_open+0x265/0x3d0\n  path_openat+0x110/0x290\n  do_filp_open+0xc3/0x170\n  do_sys_openat2+0x71/0xe0\n  __x64_sys_openat+0x6d/0xa0\n  do_syscall_64+0x62/0x310\n  entry_SYSCALL_64_after_hwframe+0x76/0x7e\n\nThe fix is to use module_param_cb to validate and reject invalid values\nassigned to def_reserved_size.","state":"PUBLISHED","assigner":"Linux","published_at":"2026-06-26 20:17:23","updated_at":"2026-06-26 20:17:23"},"problem_types":[],"metrics":[],"references":[{"url":"https://git.kernel.org/stable/c/1afd963fcd963db0dc5d47df6dfcf010c9c4647e","name":"https://git.kernel.org/stable/c/1afd963fcd963db0dc5d47df6dfcf010c9c4647e","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/3d74e0654ac908c65a8f20373091826fe43b1363","name":"https://git.kernel.org/stable/c/3d74e0654ac908c65a8f20373091826fe43b1363","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/9676ca7b1ef31a3a65b3e61e7ce3b54ce7364202","name":"https://git.kernel.org/stable/c/9676ca7b1ef31a3a65b3e61e7ce3b54ce7364202","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/fe671d3c84ffb1b763d590c25195755adeaadaba","name":"https://git.kernel.org/stable/c/fe671d3c84ffb1b763d590c25195755adeaadaba","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/feade299e932967de27519338d41de348fb5b061","name":"https://git.kernel.org/stable/c/feade299e932967de27519338d41de348fb5b061","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/c47ccfb3d80dfed522ca06a5954ac97488d78c5a","name":"https://git.kernel.org/stable/c/c47ccfb3d80dfed522ca06a5954ac97488d78c5a","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/d06a310b45e153872033dd0cf19d5a2279121099","name":"https://git.kernel.org/stable/c/d06a310b45e153872033dd0cf19d5a2279121099","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/c5f4a211e82d04ccc1809311322c47023bbe66e2","name":"https://git.kernel.org/stable/c/c5f4a211e82d04ccc1809311322c47023bbe66e2","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-53304","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-53304","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 6460e75a104d10458817d2f5b2fbff775bf0b43a 3d74e0654ac908c65a8f20373091826fe43b1363 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 6460e75a104d10458817d2f5b2fbff775bf0b43a c47ccfb3d80dfed522ca06a5954ac97488d78c5a git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 6460e75a104d10458817d2f5b2fbff775bf0b43a fe671d3c84ffb1b763d590c25195755adeaadaba git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 6460e75a104d10458817d2f5b2fbff775bf0b43a c5f4a211e82d04ccc1809311322c47023bbe66e2 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 6460e75a104d10458817d2f5b2fbff775bf0b43a 9676ca7b1ef31a3a65b3e61e7ce3b54ce7364202 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 6460e75a104d10458817d2f5b2fbff775bf0b43a 1afd963fcd963db0dc5d47df6dfcf010c9c4647e git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 6460e75a104d10458817d2f5b2fbff775bf0b43a feade299e932967de27519338d41de348fb5b061 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 6460e75a104d10458817d2f5b2fbff775bf0b43a d06a310b45e153872033dd0cf19d5a2279121099 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 2.6.19","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 2.6.19 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 5.10.258 5.10.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 5.15.209 5.15.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.1.175 6.1.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.6.141 6.6.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.12.91 6.12.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.18.33 6.18.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.0.10 7.0.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.1 * original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":null,"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"defaultStatus":"unaffected","product":"Linux","programFiles":["drivers/scsi/sg.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"3d74e0654ac908c65a8f20373091826fe43b1363","status":"affected","version":"6460e75a104d10458817d2f5b2fbff775bf0b43a","versionType":"git"},{"lessThan":"c47ccfb3d80dfed522ca06a5954ac97488d78c5a","status":"affected","version":"6460e75a104d10458817d2f5b2fbff775bf0b43a","versionType":"git"},{"lessThan":"fe671d3c84ffb1b763d590c25195755adeaadaba","status":"affected","version":"6460e75a104d10458817d2f5b2fbff775bf0b43a","versionType":"git"},{"lessThan":"c5f4a211e82d04ccc1809311322c47023bbe66e2","status":"affected","version":"6460e75a104d10458817d2f5b2fbff775bf0b43a","versionType":"git"},{"lessThan":"9676ca7b1ef31a3a65b3e61e7ce3b54ce7364202","status":"affected","version":"6460e75a104d10458817d2f5b2fbff775bf0b43a","versionType":"git"},{"lessThan":"1afd963fcd963db0dc5d47df6dfcf010c9c4647e","status":"affected","version":"6460e75a104d10458817d2f5b2fbff775bf0b43a","versionType":"git"},{"lessThan":"feade299e932967de27519338d41de348fb5b061","status":"affected","version":"6460e75a104d10458817d2f5b2fbff775bf0b43a","versionType":"git"},{"lessThan":"d06a310b45e153872033dd0cf19d5a2279121099","status":"affected","version":"6460e75a104d10458817d2f5b2fbff775bf0b43a","versionType":"git"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["drivers/scsi/sg.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"2.6.19"},{"lessThan":"2.6.19","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"5.10.*","status":"unaffected","version":"5.10.258","versionType":"semver"},{"lessThanOrEqual":"5.15.*","status":"unaffected","version":"5.15.209","versionType":"semver"},{"lessThanOrEqual":"6.1.*","status":"unaffected","version":"6.1.175","versionType":"semver"},{"lessThanOrEqual":"6.6.*","status":"unaffected","version":"6.6.141","versionType":"semver"},{"lessThanOrEqual":"6.12.*","status":"unaffected","version":"6.12.91","versionType":"semver"},{"lessThanOrEqual":"6.18.*","status":"unaffected","version":"6.18.33","versionType":"semver"},{"lessThanOrEqual":"7.0.*","status":"unaffected","version":"7.0.10","versionType":"semver"},{"lessThanOrEqual":"*","status":"unaffected","version":"7.1","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"5.10.258","versionStartIncluding":"2.6.19","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"5.15.209","versionStartIncluding":"2.6.19","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.1.175","versionStartIncluding":"2.6.19","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.6.141","versionStartIncluding":"2.6.19","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.12.91","versionStartIncluding":"2.6.19","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.18.33","versionStartIncluding":"2.6.19","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.0.10","versionStartIncluding":"2.6.19","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.1","versionStartIncluding":"2.6.19","vulnerable":true}],"negate":false,"operator":"OR"}]}],"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nscsi: sg: Resolve soft lockup issue when opening /dev/sgX\n\nThe parameter def_reserved_size defines the default buffer size reserved\nfor each Sg_fd and should be restricted to a range between 0 and 1,048,576\n(see https://tldp.org/HOWTO/SCSI-Generic-HOWTO/proc.html).  Although the\nfunction sg_proc_write_dressz enforces this limit, it is possible to bypass\nit by directly modifying the module parameter as shown below, which then\ncauses a soft lockup:\n\necho -1 > /sys/module/sg/parameters/def_reserved_size\nexec 4<> /dev/sg0\n\nwatchdog: BUG: soft lockup - CPU#5 stuck for 26 seconds! [bash:537]\nModules loaded:\nCPU: 5 UID: 0 PID: 537 Command: bash, kernel version 6.19.0-rc3+ #134,\nPREEMPT disabled\nHardware: QEMU Standard PC (i440FX + PIIX, 1996), BIOS version\n1.16.1-2.fc37 dated 04/01/2014\n...\nCall Trace:\n\n  sg_build_reserve+0x5c/0xa0\n  sg_add_sfp+0x168/0x270\n  sg_open+0x16e/0x340\n  chrdev_open+0xbe/0x230\n  do_dentry_open+0x175/0x480\n  vfs_open+0x34/0xf0\n  do_open+0x265/0x3d0\n  path_openat+0x110/0x290\n  do_filp_open+0xc3/0x170\n  do_sys_openat2+0x71/0xe0\n  __x64_sys_openat+0x6d/0xa0\n  do_syscall_64+0x62/0x310\n  entry_SYSCALL_64_after_hwframe+0x76/0x7e\n\nThe fix is to use module_param_cb to validate and reject invalid values\nassigned to def_reserved_size."}],"providerMetadata":{"dateUpdated":"2026-06-26T19:41:00.056Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/3d74e0654ac908c65a8f20373091826fe43b1363"},{"url":"https://git.kernel.org/stable/c/c47ccfb3d80dfed522ca06a5954ac97488d78c5a"},{"url":"https://git.kernel.org/stable/c/fe671d3c84ffb1b763d590c25195755adeaadaba"},{"url":"https://git.kernel.org/stable/c/c5f4a211e82d04ccc1809311322c47023bbe66e2"},{"url":"https://git.kernel.org/stable/c/9676ca7b1ef31a3a65b3e61e7ce3b54ce7364202"},{"url":"https://git.kernel.org/stable/c/1afd963fcd963db0dc5d47df6dfcf010c9c4647e"},{"url":"https://git.kernel.org/stable/c/feade299e932967de27519338d41de348fb5b061"},{"url":"https://git.kernel.org/stable/c/d06a310b45e153872033dd0cf19d5a2279121099"}],"title":"scsi: sg: Resolve soft lockup issue when opening /dev/sgX","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-53304","datePublished":"2026-06-26T19:41:00.056Z","dateReserved":"2026-06-09T07:44:35.397Z","dateUpdated":"2026-06-26T19:41:00.056Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-06-26 20:17:23","lastModifiedDate":"2026-06-26 20:17:23","problem_types":[],"metrics":[],"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"53304","Ordinal":"1","Title":"scsi: sg: Resolve soft lockup issue when opening /dev/sgX","CVE":"CVE-2026-53304","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"53304","Ordinal":"1","NoteData":"In the Linux kernel, the following vulnerability has been resolved:\n\nscsi: sg: Resolve soft lockup issue when opening /dev/sgX\n\nThe parameter def_reserved_size defines the default buffer size reserved\nfor each Sg_fd and should be restricted to a range between 0 and 1,048,576\n(see https://tldp.org/HOWTO/SCSI-Generic-HOWTO/proc.html).  Although the\nfunction sg_proc_write_dressz enforces this limit, it is possible to bypass\nit by directly modifying the module parameter as shown below, which then\ncauses a soft lockup:\n\necho -1 > /sys/module/sg/parameters/def_reserved_size\nexec 4<> /dev/sg0\n\nwatchdog: BUG: soft lockup - CPU#5 stuck for 26 seconds! [bash:537]\nModules loaded:\nCPU: 5 UID: 0 PID: 537 Command: bash, kernel version 6.19.0-rc3+ #134,\nPREEMPT disabled\nHardware: QEMU Standard PC (i440FX + PIIX, 1996), BIOS version\n1.16.1-2.fc37 dated 04/01/2014\n...\nCall Trace:\n\n  sg_build_reserve+0x5c/0xa0\n  sg_add_sfp+0x168/0x270\n  sg_open+0x16e/0x340\n  chrdev_open+0xbe/0x230\n  do_dentry_open+0x175/0x480\n  vfs_open+0x34/0xf0\n  do_open+0x265/0x3d0\n  path_openat+0x110/0x290\n  do_filp_open+0xc3/0x170\n  do_sys_openat2+0x71/0xe0\n  __x64_sys_openat+0x6d/0xa0\n  do_syscall_64+0x62/0x310\n  entry_SYSCALL_64_after_hwframe+0x76/0x7e\n\nThe fix is to use module_param_cb to validate and reject invalid values\nassigned to def_reserved_size.","Type":"Description","Title":"scsi: sg: Resolve soft lockup issue when opening /dev/sgX"}]}}}