CVE-2025-71123 (GCVE-0-2025-71123)

Vulnerability from cvelistv5 – Published: 2026-01-14 15:06 – Updated: 2026-05-11 21:55
VLAI?
Title
ext4: fix string copying in parse_apply_sb_mount_options()
Summary
In the Linux kernel, the following vulnerability has been resolved: ext4: fix string copying in parse_apply_sb_mount_options() strscpy_pad() can't be used to copy a non-NUL-term string into a NUL-term string of possibly bigger size. Commit 0efc5990bca5 ("string.h: Introduce memtostr() and memtostr_pad()") provides additional information in that regard. So if this happens, the following warning is observed: strnlen: detected buffer overflow: 65 byte read of buffer size 64 WARNING: CPU: 0 PID: 28655 at lib/string_helpers.c:1032 __fortify_report+0x96/0xc0 lib/string_helpers.c:1032 Modules linked in: CPU: 0 UID: 0 PID: 28655 Comm: syz-executor.3 Not tainted 6.12.54-syzkaller-00144-g5f0270f1ba00 #0 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 RIP: 0010:__fortify_report+0x96/0xc0 lib/string_helpers.c:1032 Call Trace: <TASK> __fortify_panic+0x1f/0x30 lib/string_helpers.c:1039 strnlen include/linux/fortify-string.h:235 [inline] sized_strscpy include/linux/fortify-string.h:309 [inline] parse_apply_sb_mount_options fs/ext4/super.c:2504 [inline] __ext4_fill_super fs/ext4/super.c:5261 [inline] ext4_fill_super+0x3c35/0xad00 fs/ext4/super.c:5706 get_tree_bdev_flags+0x387/0x620 fs/super.c:1636 vfs_get_tree+0x93/0x380 fs/super.c:1814 do_new_mount fs/namespace.c:3553 [inline] path_mount+0x6ae/0x1f70 fs/namespace.c:3880 do_mount fs/namespace.c:3893 [inline] __do_sys_mount fs/namespace.c:4103 [inline] __se_sys_mount fs/namespace.c:4080 [inline] __x64_sys_mount+0x280/0x300 fs/namespace.c:4080 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0x64/0x140 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x76/0x7e Since userspace is expected to provide s_mount_opts field to be at most 63 characters long with the ending byte being NUL-term, use a 64-byte buffer which matches the size of s_mount_opts, so that strscpy_pad() does its job properly. Return with error if the user still managed to provide a non-NUL-term string here. Found by Linux Verification Center (linuxtesting.org) with Syzkaller.
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: b2bac84fde28fb6a88817b8b761abda17a1d300b , < 52ac96c4a2dd7bc47666000440b0602d9742e820 (git)
Affected: e651294218d2684302ee5ed95ccf381646f3e5b4 , < 6e37143560e37869d51b7d9e0ac61fc48895f8a0 (git)
Affected: 01829af7656b56d83682b3491265d583d502e502 , < 902ca2356f1e3ec5355c5808ad5d3f9d0095b0cc (git)
Affected: 2a0cf438320cdb783e0378570744c0ef0d83e934 , < db9ee13fab0267eccf6544ee35b16c9522db9aac (git)
Affected: 8ecb790ea8c3fc69e77bace57f14cf0d7c177bd8 , < 5bbacbbf1ca4419861dca3c6b82707c10e9c021c (git)
Affected: 8ecb790ea8c3fc69e77bace57f14cf0d7c177bd8 , < ee5a977b4e771cc181f39d504426dbd31ed701cc (git)
Affected: 7bf46ff83a0ef11836e38ebd72cdc5107209342d (git)
Affected: a6e94557cd05adc82fae0400f6e17745563e5412 (git)
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Linux Linux Affected: 6.18
Unaffected: 0 , < 6.18 (semver)
Unaffected: 5.10.248 , ≤ 5.10.* (semver)
Unaffected: 6.1.160 , ≤ 6.1.* (semver)
Unaffected: 6.6.120 , ≤ 6.6.* (semver)
Unaffected: 6.12.64 , ≤ 6.12.* (semver)
Unaffected: 6.18.3 , ≤ 6.18.* (semver)
Unaffected: 6.19 , ≤ * (original_commit_for_fix)
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    "nvd": "{\"cve\":{\"id\":\"CVE-2025-71123\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-01-14T15:16:02.000\",\"lastModified\":\"2026-03-25T18:28:38.503\",\"vulnStatus\":\"Analyzed\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\next4: fix string copying in parse_apply_sb_mount_options()\\n\\nstrscpy_pad() can\u0027t be used to copy a non-NUL-term string into a NUL-term\\nstring of possibly bigger size.  Commit 0efc5990bca5 (\\\"string.h: Introduce\\nmemtostr() and memtostr_pad()\\\") provides additional information in that\\nregard.  So if this happens, the following warning is observed:\\n\\nstrnlen: detected buffer overflow: 65 byte read of buffer size 64\\nWARNING: CPU: 0 PID: 28655 at lib/string_helpers.c:1032 __fortify_report+0x96/0xc0 lib/string_helpers.c:1032\\nModules linked in:\\nCPU: 0 UID: 0 PID: 28655 Comm: syz-executor.3 Not tainted 6.12.54-syzkaller-00144-g5f0270f1ba00 #0\\nHardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.3-debian-1.16.3-2 04/01/2014\\nRIP: 0010:__fortify_report+0x96/0xc0 lib/string_helpers.c:1032\\nCall Trace:\\n \u003cTASK\u003e\\n __fortify_panic+0x1f/0x30 lib/string_helpers.c:1039\\n strnlen include/linux/fortify-string.h:235 [inline]\\n sized_strscpy include/linux/fortify-string.h:309 [inline]\\n parse_apply_sb_mount_options fs/ext4/super.c:2504 [inline]\\n __ext4_fill_super fs/ext4/super.c:5261 [inline]\\n ext4_fill_super+0x3c35/0xad00 fs/ext4/super.c:5706\\n get_tree_bdev_flags+0x387/0x620 fs/super.c:1636\\n vfs_get_tree+0x93/0x380 fs/super.c:1814\\n do_new_mount fs/namespace.c:3553 [inline]\\n path_mount+0x6ae/0x1f70 fs/namespace.c:3880\\n do_mount fs/namespace.c:3893 [inline]\\n __do_sys_mount fs/namespace.c:4103 [inline]\\n __se_sys_mount fs/namespace.c:4080 [inline]\\n __x64_sys_mount+0x280/0x300 fs/namespace.c:4080\\n do_syscall_x64 arch/x86/entry/common.c:52 [inline]\\n do_syscall_64+0x64/0x140 arch/x86/entry/common.c:83\\n entry_SYSCALL_64_after_hwframe+0x76/0x7e\\n\\nSince userspace is expected to provide s_mount_opts field to be at most 63\\ncharacters long with the ending byte being NUL-term, use a 64-byte buffer\\nwhich matches the size of s_mount_opts, so that strscpy_pad() does its job\\nproperly.  Return with error if the user still managed to provide a\\nnon-NUL-term string here.\\n\\nFound by Linux Verification Center (linuxtesting.org) with Syzkaller.\"}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H\",\"baseScore\":7.8,\"baseSeverity\":\"HIGH\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":5.9}]},\"weaknesses\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"NVD-CWE-noinfo\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.4.301\",\"versionEndExcluding\":\"5.5\",\"matchCriteriaId\":\"ABCD8233-CFD6-4194-AA34-BD9E287307E3\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.10.246\",\"versionEndExcluding\":\"5.10.248\",\"matchCriteriaId\":\"B493FE88-E93E-41E6-905B-84D636E8D995\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.1.158\",\"versionEndExcluding\":\"6.1.160\",\"matchCriteriaId\":\"5D82DB41-FE37-4DBE-90D1-55838504A12B\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.6.114\",\"versionEndExcluding\":\"6.6.120\",\"matchCriteriaId\":\"132C353E-B372-43F7-9F5D-81FDECC04B27\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.12.54\",\"versionEndExcluding\":\"6.12.64\",\"matchCriteriaId\":\"0B335F73-3E9B-471B-AE8B-F4192A2CC5E4\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.17.4\",\"versionEndExcluding\":\"6.18\",\"matchCriteriaId\":\"03CF48C0-2F25-4797-9371-AD6932300161\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.18.1\",\"versionEndExcluding\":\"6.18.3\",\"matchCriteriaId\":\"A3586EB6-087D-41EA-AD79-2AA54D44AAA1\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.18:-:*:*:*:*:*:*\",\"matchCriteriaId\":\"DCE57113-2223-4308-A0F2-5E6ECFBB3C23\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.19:rc1:*:*:*:*:*:*\",\"matchCriteriaId\":\"17B67AA7-40D6-4AFA-8459-F200F3D7CFD1\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.19:rc2:*:*:*:*:*:*\",\"matchCriteriaId\":\"C47E4CC9-C826-4FA9-B014-7FE3D9B318B2\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.19:rc3:*:*:*:*:*:*\",\"matchCriteriaId\":\"F71D92C0-C023-48BD-B3B6-70B638EEE298\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.19:rc4:*:*:*:*:*:*\",\"matchCriteriaId\":\"13580667-0A98-40CC-B29F-D12790B91BDB\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.19:rc5:*:*:*:*:*:*\",\"matchCriteriaId\":\"CAD1FED7-CF48-47BF-AC7D-7B6FA3C065FC\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.19:rc6:*:*:*:*:*:*\",\"matchCriteriaId\":\"3EF854A1-ABB1-4E93-BE9A-44569EC76C0D\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.19:rc7:*:*:*:*:*:*\",\"matchCriteriaId\":\"F5DC0CA6-F0AF-4DDF-A882-3DADB9A886A7\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.19:rc8:*:*:*:*:*:*\",\"matchCriteriaId\":\"EB5B7DFC-C36B-45D8-922C-877569FDDF43\"}]}]}],\"references\":[{\"url\":\"https://git.kernel.org/stable/c/52ac96c4a2dd7bc47666000440b0602d9742e820\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/5bbacbbf1ca4419861dca3c6b82707c10e9c021c\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/6e37143560e37869d51b7d9e0ac61fc48895f8a0\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/902ca2356f1e3ec5355c5808ad5d3f9d0095b0cc\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/db9ee13fab0267eccf6544ee35b16c9522db9aac\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/ee5a977b4e771cc181f39d504426dbd31ed701cc\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]}]}}"
  }
}


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Taxonomy of the tags.




Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



Detection rules are retrieved from Rulezet.