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CVE-2026-46303— isofs: validate Rock Ridge CE continuation extent against volume size

CVSS 8.2 · High EPSS 0.28% · P20

Possible ATT&CK Techniques 1AI

T1083 · File and Directory Discovery

Affected Version Matrix 34

VendorProductVersion RangeStatus
LinuxLinuxf54e18f1b831c92f6512d2eedb224cd63d607d3d< 8356fb821016797f5677cbeee5ddc0d32a95b4beaffected
f54e18f1b831c92f6512d2eedb224cd63d607d3d< d582e12378bc1637f337622feef762f53c43fd57affected
f54e18f1b831c92f6512d2eedb224cd63d607d3d< bf1bc673c587f5ef7e9c09b94aea7c5a7847d4d9affected
f54e18f1b831c92f6512d2eedb224cd63d607d3d< c9b37c8b73f6368e4750e5ccb0632c380b43c6e5affected
f54e18f1b831c92f6512d2eedb224cd63d607d3d< 22b36fa081f38ab397c7697f9d539211b51a0cfcaffected
f54e18f1b831c92f6512d2eedb224cd63d607d3d< e69da8eeab74b4f4505024c38a17bce060fe7df8affected
f54e18f1b831c92f6512d2eedb224cd63d607d3d< ef048470c90bc8c1b8318bb2ce329da9ef64b9feaffected
f54e18f1b831c92f6512d2eedb224cd63d607d3d< a36d990f591320e9dd379ab30063ebfe91d47e1faffected
… +26 more rows
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I. Basic Information for CVE-2026-46303

Vulnerability Information
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Vulnerability Title
isofs: validate Rock Ridge CE continuation extent against volume size
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: isofs: validate Rock Ridge CE continuation extent against volume size rock_continue() reads rs->cont_extent verbatim from the Rock Ridge CE record and passes it to sb_bread() without checking that the block number is within the mounted ISO 9660 volume. commit e595447e177b ("[PATCH] rock.c: handle corrupted directories") added cont_offset and cont_size rejection for the CE continuation but did not validate the extent block number itself. commit f54e18f1b831 ("isofs: Fix infinite looping over CE entries") later capped the CE chain length at RR_MAX_CE_ENTRIES = 32 but again left the block number unchecked. With a crafted ISO mounted via udisks2 (desktop optical auto-mount) or via CAP_SYS_ADMIN mount, rs->cont_extent can therefore point at an out-of-range block or at blocks belonging to an adjacent filesystem on the same block device. sb_bread() on an out-of-range block returns NULL cleanly via the block layer EIO path, so there is no memory-safety violation. For in-range reads of adjacent- filesystem data, the CE buffer is parsed as Rock Ridge records and only the text of SL sub-records reaches userspace through readlink(), which makes the info-leak channel narrow and difficult to exploit; still, rejecting the malformed CE outright matches the rejection shape already present in the same function for cont_offset and cont_size. Add an ISOFS_SB(sb)->s_nzones bounds check to rock_continue() next to the existing offset/size rejection, printing the same corrupted-directory-entry notice.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N
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isofs中Rock Ridge CE延续范围未验证卷大小，可能导致越界块访问。
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 f54e18f1b831c92f6512d2eedb224cd63d607d3d ~ 8356fb821016797f5677cbeee5ddc0d32a95b4be -
LinuxLinux 3.19 -

II. Public POCs for CVE-2026-46303

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III. Intelligence Information for CVE-2026-46303

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Patches & Fixes for CVE-2026-46303 (8)

Same Patch Batch · Linux · 2026-06-08 · 41 CVEs total

CVE-2026-462899.8 CRITICALlib/scatterlist: fix length calculations in extract_kvec_to_sg
CVE-2026-462888.4 HIGHof: unittest: fix use-after-free in of_unittest_changeset()
CVE-2026-463078.3 HIGHwifi: ath5k: do not access array OOB
CVE-2026-462747.8 HIGHio-wq: check that the predecessor is hashed in io_wq_remove_pending()
CVE-2026-462757.8 HIGHBluetooth: hci_uart: fix UAFs and race conditions in close and init paths
CVE-2026-462777.8 HIGHmm/zone_device: do not touch device folio after calling ->folio_free()
CVE-2026-462807.8 HIGHlib: test_hmm: evict device pages on file close to avoid use-after-free
CVE-2026-463117.8 HIGHdrm/amdgpu/userq: fix access to stale wptr mapping
CVE-2026-463047.5 HIGHnvmet: avoid recursive nvmet-wq flush in nvmet_ctrl_free
CVE-2026-463067.5 HIGHflow_dissector: do not dissect PPPoE PFC frames
CVE-2026-462997.0 HIGHhfsplus: fix held lock freed on hfsplus_fill_super()
CVE-2026-46296spi: s3c64xx: fix NULL-deref on driver unbind
CVE-2026-46314drm/v3d: Reject empty multisync extension to prevent infinite loop
CVE-2026-46298pseries/papr-hvpipe: Fix race with interrupt handler
CVE-2026-46301spi: topcliff-pch: fix use-after-free on unbind
CVE-2026-46302selinux: allow multiple opens of /sys/fs/selinux/policy
CVE-2026-46305staging: rtl8723bs: os_dep: avoid NULL pointer dereference in rtw_cbuf_alloc
CVE-2026-46308pmdomain: mediatek: fix use-after-free in scpsys_get_bus_protection_legacy()
CVE-2026-46309drm/xe/uapi: Reject coh_none PAT index for CPU cached memory in madvise
CVE-2026-46310media: renesas: vsp1: Fix NULL pointer deref on module unload

Showing top 20 of 41 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

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