{ "document": { "category": "csaf_vex", "csaf_version": "2.0", "distribution": { "text": "TuxCare License Agreement", "tlp": { "label": "WHITE", "url": "https://www.first.org/tlp/" } }, "lang": "en", "notes": [ { "category": "legal_disclaimer", "text": "This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Cloud Linux Inc. and provide a link to the original.", "title": "Terms of Use" } ], "publisher": { "category": "vendor", "contact_details": "https://tuxcare.com/contact/", "name": "TuxCare", "namespace": "https://tuxcare.com/" }, "references": [ { "category": "self", "summary": "Canonical URL", "url": "https://security.tuxcare.com/csaf/v2/els_os/debian10els/vex/2026/cve-2026-64593-els_os-debian10els.json" } ], "tracking": { "current_release_date": "2026-08-25T12:53:34Z", "generator": { "date": "2026-08-25T12:53:34Z", "engine": { "name": "pyCSAF" } }, "id": "CVE-2026-64593-ELS_OS-DEBIAN10ELS", "initial_release_date": "2026-08-06T08:16:00Z", "revision_history": [ { "date": "2026-08-06T08:16:00Z", "number": "1", "summary": "Initial version" }, { "date": "2026-08-25T12:53:34Z", "number": "2", "summary": "Official Publication" } ], "status": "final", "version": "2" }, "title": "Security update on 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} } } ], "category": "architecture", "name": "all" } ], "category": "vendor", "name": "TuxCare" } ], "relationships": [ { "category": "default_component_of", "full_product_name": { "name": "linux-headers-4.19.0-28-all-amd64-0:4.19.325-1+tuxcare.els1.amd64 as a component of Debian 10", "product_id": "Debian-10:linux-headers-4.19.0-28-all-amd64-0:4.19.325-1+tuxcare.els1.amd64" }, "product_reference": "linux-headers-4.19.0-28-all-amd64-0:4.19.325-1+tuxcare.els1.amd64", "relates_to_product_reference": "Debian-10" }, { "category": "default_component_of", "full_product_name": { "name": "linux-libc-dev-0:4.19.325-1+tuxcare.els1.amd64 as a component of Debian 10", "product_id": "Debian-10:linux-libc-dev-0:4.19.325-1+tuxcare.els1.amd64" }, "product_reference": "linux-libc-dev-0:4.19.325-1+tuxcare.els1.amd64", "relates_to_product_reference": "Debian-10" }, { "category": "default_component_of", "full_product_name": { "name": "libcpupower1-0:4.19.325-1+tuxcare.els1.amd64 as a component of Debian 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"category": "default_component_of", "full_product_name": { "name": "linux-image-4.19.0-28-amd64-unsigned-0:4.19.325-1+tuxcare.els1.amd64 as a component of Debian 10", "product_id": "Debian-10:linux-image-4.19.0-28-amd64-unsigned-0:4.19.325-1+tuxcare.els1.amd64" }, "product_reference": "linux-image-4.19.0-28-amd64-unsigned-0:4.19.325-1+tuxcare.els1.amd64", "relates_to_product_reference": "Debian-10" } ] }, "vulnerabilities": [ { "cve": "CVE-2026-64593", "notes": [ { "category": "description", "text": "In the Linux kernel, the following vulnerability has been resolved:\n\nbtrfs: do not trim a device which is not writeable\n\n[BUG]\nThere is a bug report that btrfs/242 can randomly fail with the\nfollowing NULL pointer dereference:\n\n run fstests btrfs/242 at 2026-06-01 10:25:08\n BTRFS: device fsid d4d7f234-487c-4787-88e4-47a8b68c9874 devid 1 transid 9 /dev/sdc (8:32) scanned by mount (122609)\n BTRFS info (device sdc): first mount of filesystem d4d7f234-487c-4787-88e4-47a8b68c9874\n BTRFS info (device sdc): using crc32c checksum algorithm\n BTRFS warning (device sdc): devid 2 uuid fbe72d72-3272-482d-80fb-ab88ed398192 is missing\n BTRFS warning (device sdc): devid 2 uuid fbe72d72-3272-482d-80fb-ab88ed398192 is missing\n BTRFS info (device sdc): allowing degraded mounts\n BTRFS info (device sdc): turning on async discard\n BTRFS info (device sdc): enabling free space tree\n Unable to handle kernel NULL pointer dereference at virtual address 0000000000000018\n user pgtable: 4k pages, 48-bit VAs, pgdp=000000013fd6b000\n CPU: 4 UID: 0 PID: 122625 Comm: fstrim Not tainted 7.0.10-2-default #1 PREEMPT(full) openSUSE Tumbleweed e9a5f6b24978fba3bf015a992f865837fdfff3dd\n Hardware name: QEMU KVM Virtual Machine, BIOS edk2-20250812-19.fc42 08/12/2025\n pstate: 01400005 (nzcv daif +PAN -UAO -TCO +DIT -SSBS BTYPE=--)\n pc : btrfs_trim_fs+0x34c/0xa00 [btrfs]\n lr : btrfs_trim_fs+0x1f0/0xa00 [btrfs]\n Call trace:\n btrfs_trim_fs+0x34c/0xa00 [btrfs f02c1d570ceea621c69d302ba75dd61868083840] (P)\n btrfs_ioctl_fitrim+0xe8/0x178 [btrfs f02c1d570ceea621c69d302ba75dd61868083840]\n btrfs_ioctl+0xdd4/0x2bd8 [btrfs f02c1d570ceea621c69d302ba75dd61868083840]\n __arm64_sys_ioctl+0xac/0x108\n invoke_syscall.constprop.0+0x5c/0xd0\n el0_svc_common.constprop.0+0x40/0xf0\n do_el0_svc+0x24/0x40\n el0_svc+0x40/0x1d0\n el0t_64_sync_handler+0xa0/0xe8\n el0t_64_sync+0x1b0/0x1b8\n Code: 17ffff83 f94017e0 f9002be0 f9402ea0 (f9400c00)\n ---[ end trace 0000000000000000 ]---\n\nAlso the reporter is very kind to test the following ASSERT() added to\nbtrfs_trim_free_extents_throttle():\n\n\tASSERT(device->bdev,\n\t \"devid=%llu path=%s dev_state=0x%lx\\n\",\n\t device->devid, btrfs_dev_name(device), device->dev_state);\n\nAnd it shows the following output:\n\n assertion failed: device->bdev, in extent-tree.c:6630 (devid=2 path=/dev/sdd dev_state=0x82)\n\nWhich means the device->bdev is NULL, and the dev_state is\nBTRFS_DEV_STATE_IN_FS_METADATA | BTRFS_DEV_STATE_ITEM_FOUND, without\nBTRFS_DEV_STATE_WRITEABLE flag set.\n\n[CAUSE]\nThe pc points to the following call chain:\n\n btrfs_trim_fs()\n |- btrfs_trim_free_extents()\n |- btrfs_trim_free_extents_throttle()\n |- bdev_max_discard_sectors(device->bdev)\n\nSo the NULL pointer dereference is caused by device->bdev being NULL.\n\nThis looks impossible by a quick glance, as just before calling\nbtrfs_trim_free_extents_throttle(), we have skipped any device that has\nBTRFS_DEV_STATE_MISSING flag set.\n\nHowever in this particular case, there is a window where the missing\ndevice is later re-scanned, causing btrfs to remove the\nBTRFS_DEV_STATE_MISSING flag:\n\n btrfs_control_ioctl()\n |- btrfs_scan_one_device()\n |- device_list_add()\n |- rcu_assign_pointer(device->name, name);\n | This updates the missing device's path to the new good path.\n |\n |- clear_bit(BTRFS_DEV_STATE_MISSING, &device->dev_state)\n This removes the BTRFS_DEV_STATE_MISSING flag.\n\nThis allows the missing device to re-appear and clear the\nBTRFS_DEV_STATE_MISSING flag. However the device still does not have\nthe BTRFS_DEV_STATE_WRITEABLE flag set, nor is its bdev pointer updated.\n\nThe bdev pointer remains NULL, triggering the crash later.\n\n[FIX]\nThis is a big de-synchronization between BTRFS_DEV_STATE_MISSING and\ndevice->bdev pointer, and shows a gap in btrfs's re-appearing-device\nhandling.\n\nThe proper handling of re-appearing device will need quite some extra\nwork, which is out of the context of this small\n---truncated---", "title": "Vulnerability description" } ], "product_status": { "under_investigation": [ "Debian-10:hyperv-daemons-0:4.19.325-1+tuxcare.els1.amd64", "Debian-10:libbpf-dev-0:4.19.325-1+tuxcare.els1.amd64", "Debian-10:libbpf4.19-0:4.19.325-1+tuxcare.els1.amd64", "Debian-10:libcpupower-dev-0:4.19.325-1+tuxcare.els1.amd64", "Debian-10:libcpupower1-0:4.19.325-1+tuxcare.els1.amd64", "Debian-10:linux-compiler-gcc-8-x86-0:4.19.325-1+tuxcare.els1.amd64", "Debian-10:linux-config-4.19-0:4.19.325-1+tuxcare.els1.amd64", "Debian-10:linux-cpupower-0:4.19.325-1+tuxcare.els1.amd64", "Debian-10:linux-doc-4.19-0:4.19.325-1+tuxcare.els1.all", "Debian-10:linux-headers-4.19.0-28-all-0:4.19.325-1+tuxcare.els1.amd64", "Debian-10:linux-headers-4.19.0-28-all-amd64-0:4.19.325-1+tuxcare.els1.amd64", "Debian-10:linux-headers-4.19.0-28-amd64-0:4.19.325-1+tuxcare.els1.amd64", "Debian-10:linux-headers-4.19.0-28-common-0:4.19.325-1+tuxcare.els1.all", "Debian-10:linux-image-4.19.0-28-amd64-unsigned-0:4.19.325-1+tuxcare.els1.amd64", "Debian-10:linux-image-amd64-signed-template-0:4.19.325-1+tuxcare.els1.amd64", "Debian-10:linux-kbuild-4.19-0:4.19.325-1+tuxcare.els1.amd64", "Debian-10:linux-libc-dev-0:4.19.325-1+tuxcare.els1.amd64", "Debian-10:linux-perf-4.19-0:4.19.325-1+tuxcare.els1.amd64", "Debian-10:linux-source-4.19-0:4.19.325-1+tuxcare.els1.all", "Debian-10:linux-support-4.19.0-28-0:4.19.325-1+tuxcare.els1.all" ] }, "references": [ { "category": "self", "summary": "Canonical URL", "url": "https://cve.tuxcare.com/els/cve/CVE-2026-64593" }, { "category": "external", "summary": "https://git.kernel.org/stable/c/02c903fc6fc7e16c5d1f22d18784f1208acf43e3", "url": "https://git.kernel.org/stable/c/02c903fc6fc7e16c5d1f22d18784f1208acf43e3" }, { "category": "external", "summary": "https://git.kernel.org/stable/c/1b1937eb08f51319bf71575484cde2b8c517aedc", "url": "https://git.kernel.org/stable/c/1b1937eb08f51319bf71575484cde2b8c517aedc" }, { "category": "external", "summary": "https://git.kernel.org/stable/c/210af872eafa0cf572a84cb303c0f9d2914c1226", "url": "https://git.kernel.org/stable/c/210af872eafa0cf572a84cb303c0f9d2914c1226" }, { "category": "external", "summary": "https://git.kernel.org/stable/c/3d8fa4b828a86b33c60858e58aaab6df273ede05", "url": "https://git.kernel.org/stable/c/3d8fa4b828a86b33c60858e58aaab6df273ede05" }, { "category": "external", "summary": "https://git.kernel.org/stable/c/7a64521802997257b144e6edfb4e278dbeb972dd", "url": "https://git.kernel.org/stable/c/7a64521802997257b144e6edfb4e278dbeb972dd" }, { "category": "external", "summary": "https://git.kernel.org/stable/c/9c894159c5b8adc84072e3af0e55b0473a69564e", "url": "https://git.kernel.org/stable/c/9c894159c5b8adc84072e3af0e55b0473a69564e" }, { "category": "external", "summary": "https://git.kernel.org/stable/c/b4af31b898a948e29861cb0bae734058f9a49d9b", "url": "https://git.kernel.org/stable/c/b4af31b898a948e29861cb0bae734058f9a49d9b" }, { "category": "external", "summary": "https://git.kernel.org/stable/c/f41ae7e6664f3c4361129728f2c4d5f3ed995251", "url": "https://git.kernel.org/stable/c/f41ae7e6664f3c4361129728f2c4d5f3ed995251" } ], "release_date": "2026-08-06T08:16:00Z", "remediations": [ { "category": "none_available", "date": "2026-08-18T12:14:41.873270Z", "details": "Affected", "product_ids": [ "Debian-10:hyperv-daemons-0:4.19.325-1+tuxcare.els1.amd64", "Debian-10:libbpf-dev-0:4.19.325-1+tuxcare.els1.amd64", "Debian-10:libbpf4.19-0:4.19.325-1+tuxcare.els1.amd64", "Debian-10:libcpupower-dev-0:4.19.325-1+tuxcare.els1.amd64", "Debian-10:libcpupower1-0:4.19.325-1+tuxcare.els1.amd64", "Debian-10:linux-compiler-gcc-8-x86-0:4.19.325-1+tuxcare.els1.amd64", "Debian-10:linux-config-4.19-0:4.19.325-1+tuxcare.els1.amd64", "Debian-10:linux-cpupower-0:4.19.325-1+tuxcare.els1.amd64", "Debian-10:linux-doc-4.19-0:4.19.325-1+tuxcare.els1.all", "Debian-10:linux-headers-4.19.0-28-all-0:4.19.325-1+tuxcare.els1.amd64", "Debian-10:linux-headers-4.19.0-28-all-amd64-0:4.19.325-1+tuxcare.els1.amd64", "Debian-10:linux-headers-4.19.0-28-amd64-0:4.19.325-1+tuxcare.els1.amd64", "Debian-10:linux-headers-4.19.0-28-common-0:4.19.325-1+tuxcare.els1.all", "Debian-10:linux-image-4.19.0-28-amd64-unsigned-0:4.19.325-1+tuxcare.els1.amd64", "Debian-10:linux-image-amd64-signed-template-0:4.19.325-1+tuxcare.els1.amd64", "Debian-10:linux-kbuild-4.19-0:4.19.325-1+tuxcare.els1.amd64", "Debian-10:linux-libc-dev-0:4.19.325-1+tuxcare.els1.amd64", "Debian-10:linux-perf-4.19-0:4.19.325-1+tuxcare.els1.amd64", "Debian-10:linux-source-4.19-0:4.19.325-1+tuxcare.els1.all", "Debian-10:linux-support-4.19.0-28-0:4.19.325-1+tuxcare.els1.all" ] } ] } ] }