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CVE-2026-63808— Linux kernel 安全漏洞

CVSS 9.8 · Critical EPSS 0.50% · P40

Affected Version Matrix 18

ベンダープロダクトVersion Rangeステータス
LinuxLinuxca06197382bde0a3bc20215595d1c9ce20c6e341< e6f1a11cfb808441a43ffae9b476cc135732cd27affected
ca06197382bde0a3bc20215595d1c9ce20c6e341< e48f413c2815787b8cade2795e194e3c4cd782efaffected
ca06197382bde0a3bc20215595d1c9ce20c6e341< 06c4e1e9967d332ac33ba38b7819851089ff9359affected
ca06197382bde0a3bc20215595d1c9ce20c6e341< 8e0abc17fbd7e305802e84fe98b4950d50f9c433affected
ca06197382bde0a3bc20215595d1c9ce20c6e341< 4d101016d5e587f820b3ae2d5bb6770d86342649affected
ca06197382bde0a3bc20215595d1c9ce20c6e341< adfacfbaeae2cb760f492357cc36b41f84ef7f86affected
ca06197382bde0a3bc20215595d1c9ce20c6e341< 708b97e792945d3e4653939fd3405d71a61ad065affected
ca06197382bde0a3bc20215595d1c9ce20c6e341< 3f5f8ee9917cc2b9076ac533492d8a200edcabb8affected
… +10 more rows
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I. CVE-2026-63808の基本情報

脆弱性情報
脆弱性についてご質問がありますか？Shenlongの分析が参考になるかご確認ください！
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脆弱性タイトル
exfat: fix potential use-after-free in exfat_find_dir_entry()
ソース: CVE Program / CVE List V5
脆弱性説明
In the Linux kernel, the following vulnerability has been resolved: exfat: fix potential use-after-free in exfat_find_dir_entry() In exfat_find_dir_entry(), the buffer_head obtained from exfat_get_dentry() is released with brelse(bh) before the fall-through TYPE_EXTEND branch reads the directory entry through ep (which points into bh->b_data): brelse(bh); if (entry_type == TYPE_EXTEND) { ... len = exfat_extract_uni_name(ep, entry_uniname); ... } After brelse() drops our reference, nothing guarantees that the underlying page backing bh->b_data remains valid for the subsequent exfat_extract_uni_name() read. This is the same pattern fixed in commit fc961522ddbd ("exfat: Fix potential use after free in exfat_load_upcase_table()"). Move brelse(bh) so it runs after ep is no longer dereferenced on each branch. Confirmed on QEMU x86_64 with CONFIG_KASAN=y + CONFIG_DEBUG_PAGEALLOC=y + CONFIG_PAGE_POISONING=y on linux-next, using a crafted exFAT image (long filename with same-hash collisions forcing the TYPE_EXTEND path). With a debug-only invalidate_bdev() inserted between brelse(bh) and the ep read to make the stale-deref window deterministic, the unpatched kernel faults: BUG: KASAN: use-after-free in exfat_find_dir_entry+0x133b/0x15a0 BUG: unable to handle page fault for address: ffff88801a5fa0c2 Oops: 0000 [#1] SMP DEBUG_PAGEALLOC KASAN NOPTI RIP: 0010:exfat_find_dir_entry+0x1188/0x15a0 With this patch applied, the same instrumented harness completes cleanly under the same sanitizer stack. I have not reproduced a crash on an uninstrumented kernel under ordinary reclaim; the instrumented A/B establishes the lifetime violation and that the patch closes it, not an unaided triggerability claim.
ソース: CVE Program / CVE List V5
CVSS情報
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
ソース: CVE Program / CVE List V5
脆弱性タイプ
N/A
ソース: CVE Program / CVE List V5
脆弱性タイトル
Linux kernel 安全漏洞
ソース: CNNVD (China National Vulnerability Database)
脆弱性説明
Linux kernel是美国Linux基金会开源的一款操作系统内核。 Linux kernel 5.7版本存在安全漏洞，该漏洞源于exfat文件系统中的exfat_find_dir_entry()函数存在释放后重用问题，可能导致攻击者利用特制的exFAT镜像触发释放后重用，进而导致系统崩溃。
ソース: CNNVD (China National Vulnerability Database)
CVSS情報
N/A
ソース: CNNVD (China National Vulnerability Database)
脆弱性タイプ
N/A
ソース: CNNVD (China National Vulnerability Database)

影響を受ける製品

ベンダープロダクト影響を受けるバージョンCPE購読
LinuxLinux ca06197382bde0a3bc20215595d1c9ce20c6e341 ~ e6f1a11cfb808441a43ffae9b476cc135732cd27 -
LinuxLinux 5.7 -

II. CVE-2026-63808の公開POC

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III. CVE-2026-63808のインテリジェンス情報

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CVE-2026-63808 补丁与修复 (6)

CVE-2026-63808 其他参考 (1)

Same Patch Batch · Linux · 2026-07-19 · 431 CVEs total

CVE-2026-6379510.0 CRITICAL9p: avoid putting oldfid in p9_client_walk() error path
CVE-2026-641429.8 CRITICALksmbd: close durable scavenger races against m_fp_list lookups
CVE-2026-639939.8 CRITICALvxlan: do not reuse cached ip_hdr() value after skb_tunnel_check_pmtu()
CVE-2026-640559.8 CRITICALnet: ethernet: cortina: Carry over frag counter
CVE-2026-640569.8 CRITICALnet: ethernet: cortina: Make RX SKB per-port
CVE-2026-640619.8 CRITICALnetfs: Fix early put of sink folio in netfs_read_gaps()
CVE-2026-639849.8 CRITICALipv6: rpl: fix hdrlen overflow in ipv6_rpl_srh_decompress()
CVE-2026-640669.8 CRITICALnetfs: Fix netfs_read_to_pagecache() to pause on subreq failure
CVE-2026-640679.8 CRITICALnetfs: Fix missing barriers when accessing stream->subrequests locklessly
CVE-2026-639229.8 CRITICALipv6: exthdrs: refresh nh after handling HAO option
CVE-2026-640689.8 CRITICALnetfs: Fix missing locking around retry adding new subreqs
CVE-2026-639249.8 CRITICALipv6: exthdrs: refresh nh pointer after ipv6_hop_jumbo()
CVE-2026-640699.8 CRITICALnetfs: Fix cancellation of a DIO and single read subrequests
CVE-2026-639799.8 CRITICALnet/handshake: hand off the pinned file reference to accept_doit
CVE-2026-639789.8 CRITICALnet/handshake: Drain pending requests at net namespace exit
CVE-2026-641229.8 CRITICALnet/mlx5e: Fix use-after-free in mlx5e_tx_reporter_timeout_recover
CVE-2026-641259.8 CRITICALnet: bcmgenet: keep RBUF EEE/PM disabled
CVE-2026-638579.8 CRITICALnet: airoha: Do not read uninitialized fragment address in airoha_dev_xmit()
CVE-2026-638009.8 CRITICALpNFS: Fix use-after-free in pnfs_update_layout()
CVE-2026-640919.8 CRITICALbatman-adv: tt: fix TOCTOU race for reported vlans

Showing 20 of 431 CVEs. View all on vendor page →

IV. 関連脆弱性

同じ製品: Linux
同じベンダー: Linux

V. CVE-2026-63808へのコメント

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