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CVE-2024-26983

Status Candidate

Overview

In the Linux kernel, the following vulnerability has been resolved: bootconfig: use memblock_free_late to free xbc memory to buddy On the time to free xbc memory in xbc_exit(), memblock may has handed over memory to buddy allocator. So it doesn't make sense to free memory back to memblock. memblock_free() called by xbc_exit() even causes UAF bugs on architectures with CONFIG_ARCH_KEEP_MEMBLOCK disabled like x86. Following KASAN logs shows this case. This patch fixes the xbc memory free problem by calling memblock_free() in early xbc init error rewind path and calling memblock_free_late() in xbc exit path to free memory to buddy allocator. [ 9.410890] ================================================================== [ 9.418962] BUG: KASAN: use-after-free in memblock_isolate_range+0x12d/0x260 [ 9.426850] Read of size 8 at addr ffff88845dd30000 by task swapper/0/1 [ 9.435901] CPU: 9 PID: 1 Comm: swapper/0 Tainted: G U 6.9.0-rc3-00208-g586b5dfb51b9 #5 [ 9.446403] Hardware name: Intel Corporation RPLP LP5 (CPU:RaptorLake)/RPLP LP5 (ID:13), BIOS IRPPN02.01.01.00.00.19.015.D-00000000 Dec 28 2023 [ 9.460789] Call Trace: [ 9.463518] <TASK> [ 9.465859] dump_stack_lvl+0x53/0x70 [ 9.469949] print_report+0xce/0x610 [ 9.473944] ? __virt_addr_valid+0xf5/0x1b0 [ 9.478619] ? memblock_isolate_range+0x12d/0x260 [ 9.483877] kasan_report+0xc6/0x100 [ 9.487870] ? memblock_isolate_range+0x12d/0x260 [ 9.493125] memblock_isolate_range+0x12d/0x260 [ 9.498187] memblock_phys_free+0xb4/0x160 [ 9.502762] ? __pfx_memblock_phys_free+0x10/0x10 [ 9.508021] ? mutex_unlock+0x7e/0xd0 [ 9.512111] ? __pfx_mutex_unlock+0x10/0x10 [ 9.516786] ? kernel_init_freeable+0x2d4/0x430 [ 9.521850] ? __pfx_kernel_init+0x10/0x10 [ 9.526426] xbc_exit+0x17/0x70 [ 9.529935] kernel_init+0x38/0x1e0 [ 9.533829] ? _raw_spin_unlock_irq+0xd/0x30 [ 9.538601] ret_from_fork+0x2c/0x50 [ 9.542596] ? __pfx_kernel_init+0x10/0x10 [ 9.547170] ret_from_fork_asm+0x1a/0x30 [ 9.551552] </TASK> [ 9.555649] The buggy address belongs to the physical page: [ 9.561875] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x1 pfn:0x45dd30 [ 9.570821] flags: 0x200000000000000(node=0|zone=2) [ 9.576271] page_type: 0xffffffff() [ 9.580167] raw: 0200000000000000 ffffea0011774c48 ffffea0012ba1848 0000000000000000 [ 9.588823] raw: 0000000000000001 0000000000000000 00000000ffffffff 0000000000000000 [ 9.597476] page dumped because: kasan: bad access detected [ 9.605362] Memory state around the buggy address: [ 9.610714] ffff88845dd2ff00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [ 9.618786] ffff88845dd2ff80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [ 9.626857] >ffff88845dd30000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff [ 9.634930] ^ [ 9.638534] ffff88845dd30080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff [ 9.646605] ffff88845dd30100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff [ 9.654675] ==================================================================

Related Files

Ubuntu Security Notice USN-6918-1
Posted Jul 29, 2024
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 6918-1 - It was discovered that a race condition existed in the Bluetooth subsystem in the Linux kernel when modifying certain settings values through debugfs. A privileged local attacker could use this to cause a denial of service. Several security issues were discovered in the Linux kernel. An attacker could possibly use these to compromise the system.

tags | advisory, denial of service, kernel, local
systems | linux, ubuntu
advisories | CVE-2023-52699, CVE-2024-26811, CVE-2024-26817, CVE-2024-26922, CVE-2024-26923, CVE-2024-26924, CVE-2024-26928, CVE-2024-26980, CVE-2024-26981, CVE-2024-26982, CVE-2024-26983, CVE-2024-26986, CVE-2024-26989, CVE-2024-26990
SHA-256 | 947dc6ce3cec3cdfef479e2eb5fb7d19c77151dd763924f5af72f2e51a47fe3b
Ubuntu Security Notice USN-6893-3
Posted Jul 23, 2024
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 6893-3 - It was discovered that a race condition existed in the Bluetooth subsystem in the Linux kernel when modifying certain settings values through debugfs. A privileged local attacker could use this to cause a denial of service. Several security issues were discovered in the Linux kernel. An attacker could possibly use these to compromise the system.

tags | advisory, denial of service, kernel, local
systems | linux, ubuntu
advisories | CVE-2023-52699, CVE-2024-26811, CVE-2024-26923, CVE-2024-26926, CVE-2024-26936, CVE-2024-26980, CVE-2024-26981, CVE-2024-26983, CVE-2024-26985, CVE-2024-26987, CVE-2024-26988, CVE-2024-26989, CVE-2024-26991, CVE-2024-26992
SHA-256 | 7f62f78668bc36911b1f96b40c020e8124cd85ad4a7b7ca69e27900327bdb441
Ubuntu Security Notice USN-6893-2
Posted Jul 16, 2024
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 6893-2 - It was discovered that a race condition existed in the Bluetooth subsystem in the Linux kernel when modifying certain settings values through debugfs. A privileged local attacker could use this to cause a denial of service. Several security issues were discovered in the Linux kernel. An attacker could possibly use these to compromise the system.

tags | advisory, denial of service, kernel, local
systems | linux, ubuntu
advisories | CVE-2023-52699, CVE-2024-26811, CVE-2024-26817, CVE-2024-26923, CVE-2024-26926, CVE-2024-26928, CVE-2024-26936, CVE-2024-26982, CVE-2024-26983, CVE-2024-26984, CVE-2024-26987, CVE-2024-26988, CVE-2024-26991, CVE-2024-26992
SHA-256 | 5a85950f4abbb032116aaee6852d49df3aa64a4a911cfe8aa786c9e093fa3440
Ubuntu Security Notice USN-6893-1
Posted Jul 12, 2024
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 6893-1 - It was discovered that a race condition existed in the Bluetooth subsystem in the Linux kernel when modifying certain settings values through debugfs. A privileged local attacker could use this to cause a denial of service. Several security issues were discovered in the Linux kernel. An attacker could possibly use these to compromise the system.

tags | advisory, denial of service, kernel, local
systems | linux, ubuntu
advisories | CVE-2023-52699, CVE-2024-26811, CVE-2024-26817, CVE-2024-26922, CVE-2024-26923, CVE-2024-26925, CVE-2024-26928, CVE-2024-26936, CVE-2024-26980, CVE-2024-26981, CVE-2024-26983, CVE-2024-26984, CVE-2024-26985, CVE-2024-26987
SHA-256 | c921ec1fdc787bcf1c8e45327ee5c68db46fe1646615a3ebdea7f0e104640d54
Debian Security Advisory 5680-1
Posted May 7, 2024
Authored by Debian | Site debian.org

Debian Linux Security Advisory 5680-1 - Several vulnerabilities have been discovered in the Linux kernel that may lead to a privilege escalation, denial of service or information leaks.

tags | advisory, denial of service, kernel, vulnerability
systems | linux, debian
advisories | CVE-2024-26605, CVE-2024-26817, CVE-2024-26922, CVE-2024-26923, CVE-2024-26924, CVE-2024-26925, CVE-2024-26926, CVE-2024-26936, CVE-2024-26939, CVE-2024-26980, CVE-2024-26981, CVE-2024-26983, CVE-2024-26984, CVE-2024-26987
SHA-256 | 7fd70cae13607fa2096b0081a446ea326e11bc606c6b954441875225d5c5e703
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