CVE-2024-53142

Advisory lineage Upstream: 0 Downstream: 55
Modified
Published: 06 Dec 2024, 09:37
Last modified:11 May 2026, 20:51

Vulnerability Summary

Overall Risk (default)
medium
31/100
CVSS Score
7.8 HIGH
v3.1 (nvd)
EPSS Score
0.02% LOW
0% probability 0.00%
KEV
Not listed
Ransomware
No reports
Public exploits
None found
Dark Web
Not detected

Timeline

06 Dec 2024, 09:37
Published
Vulnerability first disclosed
11 May 2026, 20:51
Last Modified
Vulnerability information updated

Description

In the Linux kernel, the following vulnerability has been resolved: initramfs: avoid filename buffer overrun The initramfs filename field is defined in Documentation/driver-api/early-userspace/buffer-format.rst as: 37 cpio_file := ALGN(4) + cpio_header + filename + "\0" + ALGN(4) + data ... 55 ============= ================== ========================= 56 Field name Field size Meaning 57 ============= ================== ========================= ... 70 c_namesize 8 bytes Length of filename, including final \0 When extracting an initramfs cpio archive, the kernel's do_name() path handler assumes a zero-terminated path at @collected, passing it directly to filp_open() / init_mkdir() / init_mknod(). If a specially crafted cpio entry carries a non-zero-terminated filename and is followed by uninitialized memory, then a file may be created with trailing characters that represent the uninitialized memory. The ability to create an initramfs entry would imply already having full control of the system, so the buffer overrun shouldn't be considered a security vulnerability. Append the output of the following bash script to an existing initramfs and observe any created /initramfs_test_fname_overrunAA* path. E.g. ./reproducer.sh | gzip >> /myinitramfs It's easiest to observe non-zero uninitialized memory when the output is gzipped, as it'll overflow the heap allocated @out_buf in __gunzip(), rather than the initrd_start+initrd_size block. ---- reproducer.sh ---- nilchar="A" # change to "\0" to properly zero terminate / pad magic="070701" ino=1 mode=$(( 0100777 )) uid=0 gid=0 nlink=1 mtime=1 filesize=0 devmajor=0 devminor=1 rdevmajor=0 rdevminor=0 csum=0 fname="initramfs_test_fname_overrun" namelen=$(( ${#fname} + 1 )) # plus one to account for terminator printf "%s%08x%08x%08x%08x%08x%08x%08x%08x%08x%08x%08x%08x%08x%s" \ $magic $ino $mode $uid $gid $nlink $mtime $filesize \ $devmajor $devminor $rdevmajor $rdevminor $namelen $csum $fname termpadlen=$(( 1 + ((4 - ((110 + $namelen) & 3)) % 4) )) printf "%.s${nilchar}" $(seq 1 $termpadlen) ---- reproducer.sh ---- Symlink filename fields handled in do_symlink() won't overrun past the data segment, due to the explicit zero-termination of the symlink target. Fix filename buffer overrun by aborting the initramfs FSM if any cpio entry doesn't carry a zero-terminator at the expected (name_len - 1) offset.

CVSS Metrics

  • v3.1•HIGH•Score: 7.8CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS Trends

Current EPSS score: 0.02%• Percentile: 6%

Techniques & Countermeasures

  • CWE-787•Out-of-bounds Write

    The product writes data past the end, or before the beginning, of the intended buffer.

Affected Systems

  • linux•linux

    ≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < bb7ac96670ab1d8d681015f9d66e45dad579af4d | ≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < c509b1acbd867d9e09580fe059a924cb5825afb1 | ≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < d3df9f26cff97beaa5643e551031795d5d5cddbe | ≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < 6983b8ac787b3add5571cda563574932a59a99bb | ≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < f892ddcf9f645380c358e73653cb0900f6bc9eb8 | ≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < 1a423bbbeaf9e3e20c4686501efd9b661fe834db | ≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < 49d01e736c3045319e030d1e75fb983011abaca7 | ≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < fb83b093f75806333b6f4ae29b158d2e0e3ec971 | ≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < e017671f534dd3f568db9e47b0583e853d2da9b5 | 2.6.12

  • linux•linux_kernel

    ≥ 2.6.12, < 4.19.325 | ≥ 4.20, < 6.6.64 | ≥ 6.7, < 6.11.11 | ≥ 6.12, < 6.12.2

References (11)