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CVE-2024-43882— exec: Fix ToCToU between perm check and set-uid/gid usage

Quick assessment

Affected
Linux Linux
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

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 exec 组件在设置uid/gid时存在ToCToU问题。

CVSS 7.8 · High EPSS 0.24% · P14

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux 9167b0b9a0ab7907191523f5a0528e3b9c288e21< d5c3c7e26275a2d83b894d30f7582a42853a958f affected
9167b0b9a0ab7907191523f5a0528e3b9c288e21< 368f6985d46657b8b466a421dddcacd4051f7ada affected
9167b0b9a0ab7907191523f5a0528e3b9c288e21< 15469d46ba34559bfe7e3de6659115778c624759 affected
9167b0b9a0ab7907191523f5a0528e3b9c288e21< 9b424c5d4130d56312e2a3be17efb0928fec4d64 affected
9167b0b9a0ab7907191523f5a0528e3b9c288e21< f6cfc6bcfd5e1cf76115b6450516ea4c99897ae1 affected
9167b0b9a0ab7907191523f5a0528e3b9c288e21< d2a2a4714d80d09b0f8eb6438ab4224690b7121e affected
9167b0b9a0ab7907191523f5a0528e3b9c288e21< 90dfbba89ad4f0d9c9744ecbb1adac4aa2ff4f3e affected
9167b0b9a0ab7907191523f5a0528e3b9c288e21< f50733b45d865f91db90919f8311e2127ce5a0cb affected
… +10 more rows
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I. Basic Information for CVE-2024-43882

Vulnerability Information
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Vulnerability Title
exec: Fix ToCToU between perm check and set-uid/gid usage
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: exec: Fix ToCToU between perm check and set-uid/gid usage When opening a file for exec via do_filp_open(), permission checking is done against the file's metadata at that moment, and on success, a file pointer is passed back. Much later in the execve() code path, the file metadata (specifically mode, uid, and gid) is used to determine if/how to set the uid and gid. However, those values may have changed since the permissions check, meaning the execution may gain unintended privileges. For example, if a file could change permissions from executable and not set-id: ---------x 1 root root 16048 Aug 7 13:16 target to set-id and non-executable: ---S------ 1 root root 16048 Aug 7 13:16 target it is possible to gain root privileges when execution should have been disallowed. While this race condition is rare in real-world scenarios, it has been observed (and proven exploitable) when package managers are updating the setuid bits of installed programs. Such files start with being world-executable but then are adjusted to be group-exec with a set-uid bit. For example, "chmod o-x,u+s target" makes "target" executable only by uid "root" and gid "cdrom", while also becoming setuid-root: -rwxr-xr-x 1 root cdrom 16048 Aug 7 13:16 target becomes: -rwsr-xr-- 1 root cdrom 16048 Aug 7 13:16 target But racing the chmod means users without group "cdrom" membership can get the permission to execute "target" just before the chmod, and when the chmod finishes, the exec reaches brpm_fill_uid(), and performs the setuid to root, violating the expressed authorization of "only cdrom group members can setuid to root". Re-check that we still have execute permissions in case the metadata has changed. It would be better to keep a copy from the perm-check time, but until we can do that refactoring, the least-bad option is to do a full inode_permission() call (under inode lock). It is understood that this is safe against dead-locks, but hardly optimal.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
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 exec 组件在设置uid/gid时存在ToCToU问题。
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

Vendor Product Affected Versions CPE Subscribe
Linux Linux 9167b0b9a0ab7907191523f5a0528e3b9c288e21 ~ d5c3c7e26275a2d83b894d30f7582a42853a958f -
Linux Linux 2.6.18 -

II. Public POCs for CVE-2024-43882

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III. Intelligence Information for CVE-2024-43882

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Other References for CVE-2024-43882 (7)

Same Patch Batch · Linux · 2024-08-21 · 68 CVEs total

CVE-2024-43881 8.8 HIGH wifi: ath12k: change DMA direction while mapping reinjected packets
CVE-2023-52910 8.8 HIGH iommu/iova: Fix alloc iova overflows issue
CVE-2022-48871 8.8 HIGH tty: serial: qcom-geni-serial: fix slab-out-of-bounds on RX FIFO buffer
CVE-2024-43878 8.1 HIGH xfrm: Fix input error path memory access
CVE-2022-48883 7.8 HIGH net/mlx5e: IPoIB, Block PKEY interfaces with less rx queues than parent
CVE-2024-43877 7.8 HIGH media: pci: ivtv: Add check for DMA map result
CVE-2022-48892 7.8 HIGH sched/core: Fix use-after-free bug in dup_user_cpus_ptr()
CVE-2023-52913 7.8 HIGH drm/i915: Fix potential context UAFs
CVE-2024-43880 7.8 HIGH mlxsw: spectrum_acl_erp: Fix object nesting warning
CVE-2023-52907 7.8 HIGH nfc: pn533: Wait for out_urb's completion in pn533_usb_send_frame()
CVE-2022-48872 7.8 HIGH misc: fastrpc: Fix use-after-free race condition for maps
CVE-2022-48873 7.8 HIGH misc: fastrpc: Don't remove map on creater_process and device_release
CVE-2022-48874 7.8 HIGH misc: fastrpc: Fix use-after-free and race in fastrpc_map_find
CVE-2023-52903 7.8 HIGH io_uring: lock overflowing for IOPOLL
CVE-2022-48887 7.8 HIGH drm/vmwgfx: Remove rcu locks from user resources
CVE-2022-48878 7.8 HIGH Bluetooth: hci_qca: Fix driver shutdown on closed serdev
CVE-2022-48899 7.8 HIGH drm/virtio: Fix GEM handle creation UAF
CVE-2024-43872 7.5 HIGH RDMA/hns: Fix soft lockup under heavy CEQE load
CVE-2023-52909 7.5 HIGH nfsd: fix handling of cached open files in nfsd4_open codepath
CVE-2023-52897 btrfs: qgroup: do not warn on record without old_roots populated

Showing top 20 of 68 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2024-43882

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