{"id":"CVE-2026-53304","state":"PUBLISHED","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.","publishedAt":"2026-06-26T19:41:00.056Z","updatedAt":"2026-06-26T19:41:00.056Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"6460e75a104d10458817d2f5b2fbff775bf0b43a","status":"affected","lessThan":"3d74e0654ac908c65a8f20373091826fe43b1363","versionType":"git"},{"version":"6460e75a104d10458817d2f5b2fbff775bf0b43a","status":"affected","lessThan":"c47ccfb3d80dfed522ca06a5954ac97488d78c5a","versionType":"git"},{"version":"6460e75a104d10458817d2f5b2fbff775bf0b43a","status":"affected","lessThan":"fe671d3c84ffb1b763d590c25195755adeaadaba","versionType":"git"},{"version":"6460e75a104d10458817d2f5b2fbff775bf0b43a","status":"affected","lessThan":"c5f4a211e82d04ccc1809311322c47023bbe66e2","versionType":"git"},{"version":"6460e75a104d10458817d2f5b2fbff775bf0b43a","status":"affected","lessThan":"9676ca7b1ef31a3a65b3e61e7ce3b54ce7364202","versionType":"git"},{"version":"6460e75a104d10458817d2f5b2fbff775bf0b43a","status":"affected","lessThan":"1afd963fcd963db0dc5d47df6dfcf010c9c4647e","versionType":"git"},{"version":"6460e75a104d10458817d2f5b2fbff775bf0b43a","status":"affected","lessThan":"feade299e932967de27519338d41de348fb5b061","versionType":"git"},{"version":"6460e75a104d10458817d2f5b2fbff775bf0b43a","status":"affected","lessThan":"d06a310b45e153872033dd0cf19d5a2279121099","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/scsi/sg.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"2.6.19","status":"affected"},{"version":"0","status":"unaffected","lessThan":"2.6.19","versionType":"semver"},{"version":"5.10.258","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.209","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.175","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.141","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.91","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.33","status":"unaffected","lessThanOrEqual":"6.18.*","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":["drivers/scsi/sg.c"]}],"references":["https://git.kernel.org/stable/c/3d74e0654ac908c65a8f20373091826fe43b1363","https://git.kernel.org/stable/c/c47ccfb3d80dfed522ca06a5954ac97488d78c5a","https://git.kernel.org/stable/c/fe671d3c84ffb1b763d590c25195755adeaadaba","https://git.kernel.org/stable/c/c5f4a211e82d04ccc1809311322c47023bbe66e2","https://git.kernel.org/stable/c/9676ca7b1ef31a3a65b3e61e7ce3b54ce7364202","https://git.kernel.org/stable/c/1afd963fcd963db0dc5d47df6dfcf010c9c4647e","https://git.kernel.org/stable/c/feade299e932967de27519338d41de348fb5b061","https://git.kernel.org/stable/c/d06a310b45e153872033dd0cf19d5a2279121099"],"weaknesses":[],"ingestedAt":"2026-10-29T20:12:16.098Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/53xxx/CVE-2026-53304.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-53304","state":"PUBLISHED","datePublished":"2026-06-26T19:41:00.056Z","dateUpdated":"2026-06-26T19:41:00.056Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-06-09T07:44:35.397Z"},"containers":{"cna":{"title":"scsi: sg: Resolve soft lockup issue when opening /dev/sgX","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."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"6460e75a104d10458817d2f5b2fbff775bf0b43a","status":"affected","lessThan":"3d74e0654ac908c65a8f20373091826fe43b1363","versionType":"git"},{"version":"6460e75a104d10458817d2f5b2fbff775bf0b43a","status":"affected","lessThan":"c47ccfb3d80dfed522ca06a5954ac97488d78c5a","versionType":"git"},{"version":"6460e75a104d10458817d2f5b2fbff775bf0b43a","status":"affected","lessThan":"fe671d3c84ffb1b763d590c25195755adeaadaba","versionType":"git"},{"version":"6460e75a104d10458817d2f5b2fbff775bf0b43a","status":"affected","lessThan":"c5f4a211e82d04ccc1809311322c47023bbe66e2","versionType":"git"},{"version":"6460e75a104d10458817d2f5b2fbff775bf0b43a","status":"affected","lessThan":"9676ca7b1ef31a3a65b3e61e7ce3b54ce7364202","versionType":"git"},{"version":"6460e75a104d10458817d2f5b2fbff775bf0b43a","status":"affected","lessThan":"1afd963fcd963db0dc5d47df6dfcf010c9c4647e","versionType":"git"},{"version":"6460e75a104d10458817d2f5b2fbff775bf0b43a","status":"affected","lessThan":"feade299e932967de27519338d41de348fb5b061","versionType":"git"},{"version":"6460e75a104d10458817d2f5b2fbff775bf0b43a","status":"affected","lessThan":"d06a310b45e153872033dd0cf19d5a2279121099","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/scsi/sg.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"2.6.19","status":"affected"},{"version":"0","status":"unaffected","lessThan":"2.6.19","versionType":"semver"},{"version":"5.10.258","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.209","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.175","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.141","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.91","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.33","status":"unaffected","lessThanOrEqual":"6.18.*","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":["drivers/scsi/sg.c"]}],"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"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-06-26T19:41:00.056Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.19","versionEndExcluding":"5.10.258"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.19","versionEndExcluding":"5.15.209"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.19","versionEndExcluding":"6.1.175"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.19","versionEndExcluding":"6.6.141"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.19","versionEndExcluding":"6.12.91"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.19","versionEndExcluding":"6.18.33"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.19","versionEndExcluding":"7.0.10"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.19","versionEndExcluding":"7.1"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}