{ "cvss": 7.8, "datePublished": "2026-04-24T15:16:32.683", "dateUpdated": "2026-11-05T22:18:41.593", "description": "In the Linux kernel, the following vulnerability has been resolved:\n\nbcache: fix cached_dev.sb_bio use-after-free and crash\n\nIn our production environment, we have received multiple crash reports\nregarding libceph, which have caught our attention:\n\n```\n[6888366.280350] Call Trace:\n[6888366.280452] blk_update_request+0x14e/0x370\n[6888366.280561] blk_mq_end_request+0x1a/0x130\n[6888366.280671] rbd_img_handle_request+0x1a0/0x1b0 [rbd]\n[6888366.280792] rbd_obj_handle_request+0x32/0x40 [rbd]\n[6888366.280903] __complete_request+0x22/0x70 [libceph]\n[6888366.281032] osd_dispatch+0x15e/0xb40 [libceph]\n[6888366.281164] ? inet_recvmsg+0x5b/0xd0\n[6888366.281272] ? ceph_tcp_recvmsg+0x6f/0xa0 [libceph]\n[6888366.281405] ceph_con_process_message+0x79/0x140 [libceph]\n[6888366.281534] ceph_con_v1_try_read+0x5d7/0xf30 [libceph]\n[6888366.281661] ceph_con_workfn+0x329/0x680 [libceph]\n```\n\nAfter analyzing the coredump file, we found that the address of\ndc->sb_bio has been freed. We know that cached_dev is only freed when it\nis stopped.\n\nSince sb_bio is a part of struct cached_dev, rather than an alloc every\ntime. If the device is stopped while writing to the superblock, the\nreleased address will be accessed at endio.\n\nThis patch hopes to wait for sb_write to complete in cached_dev_free.\n\nIt should be noted that we analyzed the cause of the problem, then tell\nall details to the QWEN and adopted the modifications it made.", "id": "CVE-2026-31580", "raw": { "affected": [ { "affectedData": [ { "defaultStatus": "unaffected", "product": "Linux", "programFiles": [ "drivers/md/bcache/super.c" ], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [ { "lessThan": "81f44ed8c3f54abb7561ece774ea4cca5070b2f2", "status": "affected", "version": "cafe563591446cf80bfbc2fe3bc72a2e36cf1060", "versionType": "git" }, { "lessThan": "f50e7c325ab1207fe941555bcff659f6d7050572", "status": "affected", "version": "cafe563591446cf80bfbc2fe3bc72a2e36cf1060", "versionType": "git" }, { "lessThan": "9467d360be70e6ee55b0c1cd2a1f1424f57b5b85", "status": "affected", "version": "cafe563591446cf80bfbc2fe3bc72a2e36cf1060", "versionType": "git" }, { "lessThan": "47fa09fe7f3e09df28a51cb2cbd8f5d2f7f6edc1", "status": "affected", "version": "cafe563591446cf80bfbc2fe3bc72a2e36cf1060", "versionType": "git" }, { "lessThan": "add4982510f3b7c318a2dd7438bdc9c63171e753", "status": "affected", "version": "cafe563591446cf80bfbc2fe3bc72a2e36cf1060", "versionType": "git" }, { "lessThan": "2d6965581e164fa2ba3f7652ddae5535f6336576", "status": "affected", "version": "cafe563591446cf80bfbc2fe3bc72a2e36cf1060", "versionType": "git" }, { "lessThan": "4f71c8ba2dc009042493021d94a9718fbe2ebf27", "status": "affected", "version": "cafe563591446cf80bfbc2fe3bc72a2e36cf1060", "versionType": "git" }, { "lessThan": "383f7fec0de8cee1cf7ae1f9d9f14044a61f10f9", "status": "affected", "version": "cafe563591446cf80bfbc2fe3bc72a2e36cf1060", "versionType": "git" }, { "lessThan": "fec114a98b8735ee89c75216c45a78e28be0f128", "status": "affected", "version": "cafe563591446cf80bfbc2fe3bc72a2e36cf1060", "versionType": "git" } ] }, { "defaultStatus": "affected", "product": "Linux", "programFiles": [ "drivers/md/bcache/super.c" ], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [ { "status": "affected", "version": "3.10" }, { "lessThan": "3.10", "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": "6.6.136", "versionType": "semver" }, { "lessThanOrEqual": "6.12.*", "status": "unaffected", "version": "6.12.83", "versionType": "semver" }, { "lessThanOrEqual": "6.18.*", "status": "unaffected", "version": "6.18.24", "versionType": "semver" }, { "lessThanOrEqual": "6.19.*", "status": "unaffected", "version": "6.19.14", "versionType": "semver" }, { "lessThanOrEqual": "7.0.*", "status": "unaffected", "version": "7.0.1", "versionType": "semver" }, { "lessThanOrEqual": "*", "status": "unaffected", "version": "7.1", "versionType": "original_commit_for_fix" } ] } ], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67" }, { "affectedData": [ { "defaultStatus": "unknown", "product": "SIMATIC S7-1500 TM MFP - GNU/Linux subsystem", "vendor": "Siemens", "versions": [ { "lessThan": "*", "status": "affected", "version": "0", "versionType": "custom" } ] } ], "source": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e" } ], "configurations": [ { "nodes": [ { "cpeMatch": [ { "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "14109CEF-714B-4029-A318-97AA58A01833", "versionEndExcluding": "6.6.136", "vulnerable": true }, { "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "A8BAD957-8E20-401C-A129-DFF3655CA0B7", "versionEndExcluding": "6.12.83", "versionStartIncluding": "6.12", "vulnerable": true }, { "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "8126B8B8-6D0B-4443-86C1-672AEE893555", "versionEndExcluding": "6.18.24", "versionStartIncluding": "6.13", "vulnerable": true }, { "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "D6A8A074-BBF4-4803-ABED-519A839435BB", "versionEndExcluding": "6.19.14", "versionStartIncluding": "6.19", "vulnerable": true }, { "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "9B5888AB-7403-4335-89E4-21CC0B48366A", "versionEndExcluding": "7.0.1", "versionStartIncluding": "7.0", "vulnerable": true } ], "negate": false, "operator": "OR" } ] } ], "cveTags": [], "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbcache: fix cached_dev.sb_bio use-after-free and crash\n\nIn our production environment, we have received multiple crash reports\nregarding libceph, which have caught our attention:\n\n```\n[6888366.280350] Call Trace:\n[6888366.280452] blk_update_request+0x14e/0x370\n[6888366.280561] blk_mq_end_request+0x1a/0x130\n[6888366.280671] rbd_img_handle_request+0x1a0/0x1b0 [rbd]\n[6888366.280792] rbd_obj_handle_request+0x32/0x40 [rbd]\n[6888366.280903] __complete_request+0x22/0x70 [libceph]\n[6888366.281032] osd_dispatch+0x15e/0xb40 [libceph]\n[6888366.281164] ? inet_recvmsg+0x5b/0xd0\n[6888366.281272] ? ceph_tcp_recvmsg+0x6f/0xa0 [libceph]\n[6888366.281405] ceph_con_process_message+0x79/0x140 [libceph]\n[6888366.281534] ceph_con_v1_try_read+0x5d7/0xf30 [libceph]\n[6888366.281661] ceph_con_workfn+0x329/0x680 [libceph]\n```\n\nAfter analyzing the coredump file, we found that the address of\ndc->sb_bio has been freed. We know that cached_dev is only freed when it\nis stopped.\n\nSince sb_bio is a part of struct cached_dev, rather than an alloc every\ntime. If the device is stopped while writing to the superblock, the\nreleased address will be accessed at endio.\n\nThis patch hopes to wait for sb_write to complete in cached_dev_free.\n\nIt should be noted that we analyzed the cause of the problem, then tell\nall details to the QWEN and adopted the modifications it made." } ], "id": "CVE-2026-31580", "lastModified": "2026-11-05T22:18:41.593", "metrics": { "cvssMetricV31": [ { "cvssData": { "attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1" }, "exploitabilityScore": 1.8, "impactScore": 5.9, "source": "nvd@nist.gov", "type": "Primary" } ], "ssvcV203": [ { "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": { "id": "CVE-2026-31580", "options": [ { "exploitation": "none" }, { "automatable": "no" }, { "technicalImpact": "partial" } ], "role": "CISA Coordinator", "timestamp": "2026-11-05T21:39:46.970760Z", "version": "2.0.3" } } ] }, "published": "2026-04-24T15:16:32.683", "references": [ { "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": [ "Patch" ], "url": "https://git.kernel.org/stable/c/2d6965581e164fa2ba3f7652ddae5535f6336576" }, { "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": [ "Patch" ], "url": "https://git.kernel.org/stable/c/383f7fec0de8cee1cf7ae1f9d9f14044a61f10f9" }, { "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": [ "Patch" ], "url": "https://git.kernel.org/stable/c/47fa09fe7f3e09df28a51cb2cbd8f5d2f7f6edc1" }, { "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": [ "Patch" ], "url": "https://git.kernel.org/stable/c/4f71c8ba2dc009042493021d94a9718fbe2ebf27" }, { "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/81f44ed8c3f54abb7561ece774ea4cca5070b2f2" }, { "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/9467d360be70e6ee55b0c1cd2a1f1424f57b5b85" }, { "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": [ "Patch" ], "url": "https://git.kernel.org/stable/c/add4982510f3b7c318a2dd7438bdc9c63171e753" }, { "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/f50e7c325ab1207fe941555bcff659f6d7050572" }, { "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": [ "Patch" ], "url": "https://git.kernel.org/stable/c/fec114a98b8735ee89c75216c45a78e28be0f128" }, { "source": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e", "url": "https://cert-portal.siemens.com/productcert/html/ssa-784472.html" } ], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [ { "description": [ { "lang": "en", "value": "CWE-416" } ], "source": "nvd@nist.gov", "type": "Primary" } ] }, "severity": "HIGH", "source": "nvd", "title": "In the Linux kernel, the following vulnerability has been resolved:\n\nbcache: fix cached_dev.sb_bio use-after-free and..." }