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CVE-2021-47508— btrfs: free exchange changeset on failures

EPSS 0.02% · P4

Affected Version Matrix 6

VendorProductVersion RangeStatus
LinuxLinux364ecf3651e0862152c8b340d7cb3021dc0122c7< ca06c5cb1b6dbfe67655b33c02fc394d65824519affected
364ecf3651e0862152c8b340d7cb3021dc0122c7< da5e817d9d75422eaaa05490d0b9a5e328fc1a51affected
4.13affected
< 4.13unaffected
5.15.8≤ 5.15.*unaffected
5.16≤ *unaffected
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I. Basic Information for CVE-2021-47508

Vulnerability Information
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Vulnerability Title
btrfs: free exchange changeset on failures
Source: NVD (National Vulnerability Database)
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: btrfs: free exchange changeset on failures Fstests runs on my VMs have show several kmemleak reports like the following. unreferenced object 0xffff88811ae59080 (size 64): comm "xfs_io", pid 12124, jiffies 4294987392 (age 6.368s) hex dump (first 32 bytes): 00 c0 1c 00 00 00 00 00 ff cf 1c 00 00 00 00 00 ................ 90 97 e5 1a 81 88 ff ff 90 97 e5 1a 81 88 ff ff ................ backtrace: [<00000000ac0176d2>] ulist_add_merge+0x60/0x150 [btrfs] [<0000000076e9f312>] set_state_bits+0x86/0xc0 [btrfs] [<0000000014fe73d6>] set_extent_bit+0x270/0x690 [btrfs] [<000000004f675208>] set_record_extent_bits+0x19/0x20 [btrfs] [<00000000b96137b1>] qgroup_reserve_data+0x274/0x310 [btrfs] [<0000000057e9dcbb>] btrfs_check_data_free_space+0x5c/0xa0 [btrfs] [<0000000019c4511d>] btrfs_delalloc_reserve_space+0x1b/0xa0 [btrfs] [<000000006d37e007>] btrfs_dio_iomap_begin+0x415/0x970 [btrfs] [<00000000fb8a74b8>] iomap_iter+0x161/0x1e0 [<0000000071dff6ff>] __iomap_dio_rw+0x1df/0x700 [<000000002567ba53>] iomap_dio_rw+0x5/0x20 [<0000000072e555f8>] btrfs_file_write_iter+0x290/0x530 [btrfs] [<000000005eb3d845>] new_sync_write+0x106/0x180 [<000000003fb505bf>] vfs_write+0x24d/0x2f0 [<000000009bb57d37>] __x64_sys_pwrite64+0x69/0xa0 [<000000003eba3fdf>] do_syscall_64+0x43/0x90 In case brtfs_qgroup_reserve_data() or btrfs_delalloc_reserve_metadata() fail the allocated extent_changeset will not be freed. So in btrfs_check_data_free_space() and btrfs_delalloc_reserve_space() free the allocated extent_changeset to get rid of the allocated memory. The issue currently only happens in the direct IO write path, but only after 65b3c08606e5 ("btrfs: fix ENOSPC failure when attempting direct IO write into NOCOW range"), and also at defrag_one_locked_target(). Every other place is always calling extent_changeset_free() even if its call to btrfs_delalloc_reserve_space() or btrfs_check_data_free_space() has failed.
Source: NVD (National Vulnerability Database)
CVSS Information
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Type
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel 存在安全漏洞，该漏洞源于 btrfs 模块存在漏洞。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

VendorProductAffected VersionsCPESubscribe
LinuxLinux 364ecf3651e0862152c8b340d7cb3021dc0122c7 ~ ca06c5cb1b6dbfe67655b33c02fc394d65824519 -
LinuxLinux 4.13 -

II. Public POCs for CVE-2021-47508

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III. Intelligence Information for CVE-2021-47508

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Same Patch Batch · Linux · 2024-05-24 · 73 CVEs total

CVE-2021-47549sata_fsl: fix UAF in sata_fsl_port_stop when rmmod sata_fsl
CVE-2021-47569io_uring: fail cancellation for EXITING tasks
CVE-2021-47567powerpc/32: Fix hardlockup on vmap stack overflow
CVE-2021-47554vdpa_sim: avoid putting an uninitialized iova_domain
CVE-2021-47555net: vlan: fix underflow for the real_dev refcnt
CVE-2021-47553sched/scs: Reset task stack state in bringup_cpu()
CVE-2021-47551drm/amd/amdkfd: Fix kernel panic when reset failed and been triggered again
CVE-2021-47552blk-mq: cancel blk-mq dispatch work in both blk_cleanup_queue and disk_release()
CVE-2021-47550drm/amd/amdgpu: fix potential memleak
CVE-2021-47548ethernet: hisilicon: hns: hns_dsaf_misc: fix a possible array overflow in hns_dsaf_ge_srst
CVE-2021-47556ethtool: ioctl: fix potential NULL deref in ethtool_set_coalesce()
CVE-2021-47547net: tulip: de4x5: fix the problem that the array 'lp->phy[8]' may be out of bound
CVE-2021-47546ipv6: fix memory leak in fib6_rule_suppress
CVE-2021-47544tcp: fix page frag corruption on page fault
CVE-2021-47542net: qlogic: qlcnic: Fix a NULL pointer dereference in qlcnic_83xx_add_rings()
CVE-2021-47541net/mlx4_en: Fix an use-after-free bug in mlx4_en_try_alloc_resources()
CVE-2021-47540mt76: mt7915: fix NULL pointer dereference in mt7915_get_phy_mode
CVE-2021-47539rxrpc: Fix rxrpc_peer leak in rxrpc_look_up_bundle()
CVE-2021-47538rxrpc: Fix rxrpc_local leak in rxrpc_lookup_peer()
CVE-2021-47536net/smc: fix wrong list_del in smc_lgr_cleanup_early

Showing top 20 of 73 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

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