netfs: break unbuffered write when netfs_alloc_subrequest() fails

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-98119
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-25 11:17:43 UTC
Updated2026-09-25 11:17:43 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: netfs: break unbuffered write when netfs_alloc_subrequest() fails syzbot reported a null-ptr-deref below [1] following a fault injection in netfs_alloc_subrequest(). [0] When netfs_alloc_subrequest() fails, subreq is NULL. Later, netfs_prepare_write() tries to initialize members of subreq(e.g., source), the issue in [1] is triggered. Let's handle the error of netfs_prepare_write() properly. [0] FAULT_INJECTION: forcing a failure. name failslab, interval 1, probability 0, space 0, times 0 Call Trace: netfs_alloc_subrequest+0x116/0x3f0 netfs_prepare_write+0x76/0x7b0 netfs_unbuffered_write+0x75c/0x2020 netfs_unbuffered_write_iter_locked+0x7d6/0xa80 netfs_unbuffered_write_iter+0x442/0x720 v9fs_file_write_iter+0xbf/0x100 vfs_write+0x6ac/0x1050 [1] KASAN: null-ptr-deref in range [0x00000000000000a8-0x00000000000000af] RIP: 0010:netfs_prepare_write+0xbc/0x7b0 fs/netfs/write_issue.c:173 Call Trace: netfs_unbuffered_write+0x75c/0x2020 fs/netfs/direct_write.c:111 netfs_unbuffered_write_iter_locked+0x7d6/0xa80 fs/netfs/direct_write.c:290 netfs_unbuffered_write_iter+0x442/0x720 fs/netfs/direct_write.c:382 v9fs_file_write_iter+0xbf/0x100 fs/9p/vfs_file.c:409 new_sync_write fs/read_write.c:595 [inline]

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 288ace2f57c9d06dd2e42bd80d03747d879a4068 cf6f93b8b06acf57de62dacbe71a3b99c68656a7 git Not specified
CNA Linux Linux affected 288ace2f57c9d06dd2e42bd80d03747d879a4068 19f246c795e940dc5f11cd5bc0cb1e81bc7b7090 git Not specified
CNA Linux Linux affected 288ace2f57c9d06dd2e42bd80d03747d879a4068 8fb45a934661419c04a44d4cfea1e0df7dcf2805 git Not specified
CNA Linux Linux affected 6.10 Not specified
CNA Linux Linux unaffected 6.10 semver Not specified
CNA Linux Linux unaffected 6.18.53 6.18.* semver Not specified
CNA Linux Linux unaffected 7.2.7 7.2.* semver Not specified
CNA Linux Linux unaffected 7.3-rc3 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/cf6f93b8b06acf57de62dacbe71a3b99c68656a7 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/19f246c795e940dc5f11cd5bc0cb1e81bc7b7090 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/8fb45a934661419c04a44d4cfea1e0df7dcf2805 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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