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CVE-2024-26704— ext4: fix double-free of blocks due to wrong extents moved_len

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，该漏洞源于存在双重释放。

CVSS 7.8 · High EPSS 0.27% · P17

Possible ATT&CK Techniques 2 AI

T1499 · Endpoint Denial of Service T1079

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux fcf6b1b729bcd23f2b49a84fb33ffbb44712ee6a< b4fbb89d722cbb16beaaea234b7230faaaf68c71 affected
fcf6b1b729bcd23f2b49a84fb33ffbb44712ee6a< afbcad9ae7d6d11608399188f03a837451b6b3a1 affected
fcf6b1b729bcd23f2b49a84fb33ffbb44712ee6a< d033a555d9a1cf53dbf3301af7199cc4a4c8f537 affected
fcf6b1b729bcd23f2b49a84fb33ffbb44712ee6a< afba9d11320dad5ce222ac8964caf64b7b4bedb1 affected
fcf6b1b729bcd23f2b49a84fb33ffbb44712ee6a< 185eab30486ba3e7bf8b9c2e049c79a06ffd2bc1 affected
fcf6b1b729bcd23f2b49a84fb33ffbb44712ee6a< 2883940b19c38d5884c8626483811acf4d7e148f affected
fcf6b1b729bcd23f2b49a84fb33ffbb44712ee6a< 559ddacb90da1d8786dd8ec4fd76bbfa404eaef6 affected
fcf6b1b729bcd23f2b49a84fb33ffbb44712ee6a< 55583e899a5357308274601364741a83e78d6ac4 affected
… +10 more rows
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I. Basic Information for CVE-2024-26704

Vulnerability Information
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Vulnerability Title
ext4: fix double-free of blocks due to wrong extents moved_len
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: ext4: fix double-free of blocks due to wrong extents moved_len In ext4_move_extents(), moved_len is only updated when all moves are successfully executed, and only discards orig_inode and donor_inode preallocations when moved_len is not zero. When the loop fails to exit after successfully moving some extents, moved_len is not updated and remains at 0, so it does not discard the preallocations. If the moved extents overlap with the preallocated extents, the overlapped extents are freed twice in ext4_mb_release_inode_pa() and ext4_process_freed_data() (as described in commit 94d7c16cbbbd ("ext4: Fix double-free of blocks with EXT4_IOC_MOVE_EXT")), and bb_free is incremented twice. Hence when trim is executed, a zero-division bug is triggered in mb_update_avg_fragment_size() because bb_free is not zero and bb_fragments is zero. Therefore, update move_len after each extent move to avoid the issue.
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，该漏洞源于存在双重释放。
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 fcf6b1b729bcd23f2b49a84fb33ffbb44712ee6a ~ b4fbb89d722cbb16beaaea234b7230faaaf68c71 -
Linux Linux 3.18 -

II. Public POCs for CVE-2024-26704

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III. Intelligence Information for CVE-2024-26704

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Mailing List Discussions for CVE-2024-26704 (2)

Other References for CVE-2024-26704 (7)

Same Patch Batch · Linux · 2024-04-03 · 94 CVEs total

CVE-2024-26760 9.8 CRITICAL scsi: target: pscsi: Fix bio_put() for error case
CVE-2024-26779 8.8 HIGH wifi: mac80211: fix race condition on enabling fast-xmit
CVE-2024-26689 8.8 HIGH ceph: prevent use-after-free in encode_cap_msg()
CVE-2024-26692 8.3 HIGH smb: Fix regression in writes when non-standard maximum write size negotiated
CVE-2024-26736 8.1 HIGH afs: Increase buffer size in afs_update_volume_status()
CVE-2024-26728 7.8 HIGH drm/amd/display: fix null-pointer dereference on edid reading
CVE-2023-52637 7.8 HIGH can: j1939: Fix UAF in j1939_sk_match_filter during setsockopt(SO_J1939_FILTER)
CVE-2024-26699 7.8 HIGH drm/amd/display: Fix array-index-out-of-bounds in dcn35_clkmgr
CVE-2024-26718 7.8 HIGH dm-crypt, dm-verity: disable tasklets
CVE-2024-26712 7.8 HIGH powerpc/kasan: Fix addr error caused by page alignment
CVE-2024-26706 7.8 HIGH parisc: Fix random data corruption from exception handler
CVE-2024-26697 7.8 HIGH nilfs2: fix data corruption in dsync block recovery for small block sizes
CVE-2024-26737 7.8 HIGH bpf: Fix racing between bpf_timer_cancel_and_free and bpf_timer_cancel
CVE-2024-26748 7.8 HIGH usb: cdns3: fix memory double free when handle zero packet
CVE-2024-26773 7.8 HIGH ext4: avoid allocating blocks from corrupted group in ext4_mb_try_best_found()
CVE-2024-26772 7.8 HIGH ext4: avoid allocating blocks from corrupted group in ext4_mb_find_by_goal()
CVE-2024-26766 7.8 HIGH IB/hfi1: Fix sdma.h tx->num_descs off-by-one error
CVE-2024-26739 7.8 HIGH net/sched: act_mirred: don't override retval if we already lost the skb
CVE-2024-26759 7.8 HIGH mm/swap: fix race when skipping swapcache
CVE-2024-26762 7.8 HIGH cxl/pci: Skip to handle RAS errors if CXL.mem device is detached

Showing top 20 of 94 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2024-26704

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