{ "dataType": "CVE_RECORD", "dataVersion": "5.1", "cveMetadata": { "cveId": "CVE-2022-48689", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2024-05-03T14:55:07.144Z", "datePublished": "2024-05-03T15:00:02.083Z", "dateUpdated": "2024-08-03T15:17:55.728Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2024-05-29T05:11:23.638Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ntcp: TX zerocopy should not sense pfmemalloc status\n\nWe got a recent syzbot report [1] showing a possible misuse\nof pfmemalloc page status in TCP zerocopy paths.\n\nIndeed, for pages coming from user space or other layers,\nusing page_is_pfmemalloc() is moot, and possibly could give\nfalse positives.\n\nThere has been attempts to make page_is_pfmemalloc() more robust,\nbut not using it in the first place in this context is probably better,\nremoving cpu cycles.\n\nNote to stable teams :\n\nYou need to backport 84ce071e38a6 (\"net: introduce\n__skb_fill_page_desc_noacc\") as a prereq.\n\nRace is more probable after commit c07aea3ef4d4\n(\"mm: add a signature in struct page\") because page_is_pfmemalloc()\nis now using low order bit from page->lru.next, which can change\nmore often than page->index.\n\nLow order bit should never be set for lru.next (when used as an anchor\nin LRU list), so KCSAN report is mostly a false positive.\n\nBackporting to older kernel versions seems not necessary.\n\n[1]\nBUG: KCSAN: data-race in lru_add_fn / tcp_build_frag\n\nwrite to 0xffffea0004a1d2c8 of 8 bytes by task 18600 on cpu 0:\n__list_add include/linux/list.h:73 [inline]\nlist_add include/linux/list.h:88 [inline]\nlruvec_add_folio include/linux/mm_inline.h:105 [inline]\nlru_add_fn+0x440/0x520 mm/swap.c:228\nfolio_batch_move_lru+0x1e1/0x2a0 mm/swap.c:246\nfolio_batch_add_and_move mm/swap.c:263 [inline]\nfolio_add_lru+0xf1/0x140 mm/swap.c:490\nfilemap_add_folio+0xf8/0x150 mm/filemap.c:948\n__filemap_get_folio+0x510/0x6d0 mm/filemap.c:1981\npagecache_get_page+0x26/0x190 mm/folio-compat.c:104\ngrab_cache_page_write_begin+0x2a/0x30 mm/folio-compat.c:116\next4_da_write_begin+0x2dd/0x5f0 fs/ext4/inode.c:2988\ngeneric_perform_write+0x1d4/0x3f0 mm/filemap.c:3738\next4_buffered_write_iter+0x235/0x3e0 fs/ext4/file.c:270\next4_file_write_iter+0x2e3/0x1210\ncall_write_iter include/linux/fs.h:2187 [inline]\nnew_sync_write fs/read_write.c:491 [inline]\nvfs_write+0x468/0x760 fs/read_write.c:578\nksys_write+0xe8/0x1a0 fs/read_write.c:631\n__do_sys_write fs/read_write.c:643 [inline]\n__se_sys_write fs/read_write.c:640 [inline]\n__x64_sys_write+0x3e/0x50 fs/read_write.c:640\ndo_syscall_x64 arch/x86/entry/common.c:50 [inline]\ndo_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80\nentry_SYSCALL_64_after_hwframe+0x63/0xcd\n\nread to 0xffffea0004a1d2c8 of 8 bytes by task 18611 on cpu 1:\npage_is_pfmemalloc include/linux/mm.h:1740 [inline]\n__skb_fill_page_desc include/linux/skbuff.h:2422 [inline]\nskb_fill_page_desc include/linux/skbuff.h:2443 [inline]\ntcp_build_frag+0x613/0xb20 net/ipv4/tcp.c:1018\ndo_tcp_sendpages+0x3e8/0xaf0 net/ipv4/tcp.c:1075\ntcp_sendpage_locked net/ipv4/tcp.c:1140 [inline]\ntcp_sendpage+0x89/0xb0 net/ipv4/tcp.c:1150\ninet_sendpage+0x7f/0xc0 net/ipv4/af_inet.c:833\nkernel_sendpage+0x184/0x300 net/socket.c:3561\nsock_sendpage+0x5a/0x70 net/socket.c:1054\npipe_to_sendpage+0x128/0x160 fs/splice.c:361\nsplice_from_pipe_feed fs/splice.c:415 [inline]\n__splice_from_pipe+0x222/0x4d0 fs/splice.c:559\nsplice_from_pipe fs/splice.c:594 [inline]\ngeneric_splice_sendpage+0x89/0xc0 fs/splice.c:743\ndo_splice_from fs/splice.c:764 [inline]\ndirect_splice_actor+0x80/0xa0 fs/splice.c:931\nsplice_direct_to_actor+0x305/0x620 fs/splice.c:886\ndo_splice_direct+0xfb/0x180 fs/splice.c:974\ndo_sendfile+0x3bf/0x910 fs/read_write.c:1249\n__do_sys_sendfile64 fs/read_write.c:1317 [inline]\n__se_sys_sendfile64 fs/read_write.c:1303 [inline]\n__x64_sys_sendfile64+0x10c/0x150 fs/read_write.c:1303\ndo_syscall_x64 arch/x86/entry/common.c:50 [inline]\ndo_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80\nentry_SYSCALL_64_after_hwframe+0x63/0xcd\n\nvalue changed: 0x0000000000000000 -> 0xffffea0004a1d288\n\nReported by Kernel Concurrency Sanitizer on:\nCPU: 1 PID: 18611 Comm: syz-executor.4 Not tainted 6.0.0-rc2-syzkaller-00248-ge022620b5d05-dirty #0\nHardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/22/2022" } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "include/linux/skbuff.h", "net/core/datagram.c", "net/ipv4/tcp.c" ], "versions": [ { "version": "c07aea3ef4d4", "lessThan": "8527c9a6bf8e", "status": "affected", "versionType": "git" }, { "version": "c07aea3ef4d4", "lessThan": "6730c48ed6b0", "status": "affected", "versionType": "git" }, { "version": "c07aea3ef4d4", "lessThan": "326140063946", "status": "affected", "versionType": "git" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "include/linux/skbuff.h", "net/core/datagram.c", "net/ipv4/tcp.c" ], "versions": [ { "version": "5.14", "status": "affected" }, { "version": "0", "lessThan": "5.14", "status": "unaffected", "versionType": "custom" }, { "version": "5.15.68", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "custom" }, { "version": "5.19.9", "lessThanOrEqual": "5.19.*", "status": "unaffected", "versionType": "custom" }, { "version": "6.0", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix" } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/8527c9a6bf8e54fef0a8d3d7d8874a48c725c915" }, { "url": "https://git.kernel.org/stable/c/6730c48ed6b0cd939fc9b30b2d621ce0b89bea83" }, { "url": "https://git.kernel.org/stable/c/3261400639463a853ba2b3be8bd009c2a8089775" } ], "title": "tcp: TX zerocopy should not sense pfmemalloc status", "x_generator": { "engine": "bippy-a5840b7849dd" } }, "adp": [ { "metrics": [ { "other": { "type": "ssvc", "content": { "timestamp": "2024-06-12T20:38:37.630720Z", "id": "CVE-2022-48689", "options": [ { "Exploitation": "none" }, { "Automatable": "no" }, { "Technical Impact": "partial" } ], "role": "CISA Coordinator", "version": "2.0.3" } } } ], "title": "CISA ADP Vulnrichment", "providerMetadata": { "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2024-06-12T20:39:14.895Z" } }, { "providerMetadata": { "orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2024-08-03T15:17:55.728Z" }, "title": "CVE Program Container", "references": [ { "url": "https://git.kernel.org/stable/c/8527c9a6bf8e54fef0a8d3d7d8874a48c725c915", "tags": [ "x_transferred" ] }, { "url": "https://git.kernel.org/stable/c/6730c48ed6b0cd939fc9b30b2d621ce0b89bea83", "tags": [ "x_transferred" ] }, { "url": "https://git.kernel.org/stable/c/3261400639463a853ba2b3be8bd009c2a8089775", "tags": [ "x_transferred" ] } ] } ] } }