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netlink: Fix kernel-infoleak-after-free in __skb_datagram_iter

Type: advisorySource: Official CVE List1 source record

In the Linux kernel, the following vulnerability has been resolved: netlink: Fix kernel-infoleak-after-free in __skb_datagram_iter syzbot reported the following uninit-value access issue [1]: netlink_to_full_skb() creates a new `skb` and puts the `skb->data` passed as a 1st arg of netlink_to_full_skb() onto new `skb`. The data size is specified as `len` and passed to skb_put_data(). This `len` is based on `skb->end` that is not data offset but buffer offset. The `skb->end` contains data and tailroom. Since the tailroom is not initialized when the new `skb` created, KMSAN detects uninitialized memory area when copying the data. This patch resolved this issue by correct the len from `skb->end` to `skb->len`, which is the actual data offset. BUG: KMSAN: kernel-infoleak-after-free in instrument_copy_to_user include/linux/instrumented.h:114 [inline] BUG: KMSAN: kernel-infoleak-after-free in copy_to_user_iter lib/iov_iter.c:24 [inline] BUG: KMSAN: kernel-infoleak-after-free in iterate_ubuf include/linux/iov_iter.h:29 [inline] BUG: KMSAN: kernel-infoleak-after-free in iterate_and_advance2 include/linux/iov_iter.h:245 [inline] BUG: KMSAN: kernel-infoleak-after-free in iterate_and_advance include/linux/iov_iter.h:271 [inline] BUG: KMSAN: kernel-infoleak-after-free in _copy_to_iter+0x364/0x2520 lib/iov_iter.c:186 instrument_copy_to_user include/linux/instrumented.h:114 [inline] copy_to_user_iter lib/iov_iter.c:24 [inline] iterate_ubuf include/linux/iov_iter.h:29 [inline] iterate_and_ad

Announced Source revision 1
Original source ↗

CVE-2024-26805

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: cve:CVE-2024-26805

Linux

Source reference: /containers/cna/affected/0/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Linux

Source reference: /containers/cna/affected/1/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
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        "status": "affected",
        "version": "1853c949646005b5959c483becde86608f548f24",
        "lessThan": "ec343a55b687a452f5e87f3b52bf9f155864df65",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "1853c949646005b5959c483becde86608f548f24",
        "lessThan": "9ae51361da43270f4ba0eb924427a07e87e48777",
        "versionType": "git"
      },
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        "status": "affected",
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      },
      {
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      },
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      {
        "status": "affected",
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        "versionType": "git"
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        "status": "affected",
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        "status": "affected",
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      {
        "status": "affected",
        "version": "3.12.49",
        "lessThan": "3.13",
        "versionType": "semver"
      },
      {
        "status": "affected",
        "version": "3.14.54",
        "lessThan": "3.15",
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      {
        "status": "affected",
        "version": "3.18.23",
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      {
        "status": "affected",
        "version": "4.1.10",
        "lessThan": "4.2",
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      {
        "status": "affected",
        "version": "4.2.3",
        "lessThan": "4.3",
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    ],
    "programFiles": [
      "net/netlink/af_netlink.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
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        "version": "4.3"
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      {
        "status": "unaffected",
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        "version": "4.19.309",
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        "lessThanOrEqual": "4.19.*"
      },
      {
        "status": "unaffected",
        "version": "5.4.271",
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        "lessThanOrEqual": "5.4.*"
      },
      {
        "status": "unaffected",
        "version": "5.10.212",
        "versionType": "semver",
        "lessThanOrEqual": "5.10.*"
      },
      {
        "status": "unaffected",
        "version": "5.15.151",
        "versionType": "semver",
        "lessThanOrEqual": "5.15.*"
      },
      {
        "status": "unaffected",
        "version": "6.1.81",
        "versionType": "semver",
        "lessThanOrEqual": "6.1.*"
      },
      {
        "status": "unaffected",
        "version": "6.6.21",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.7.9",
        "versionType": "semver",
        "lessThanOrEqual": "6.7.*"
      },
      {
        "status": "unaffected",
        "version": "6.8",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "net/netlink/af_netlink.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2024-26805

Source reference: /cveMetadata/cveId

Publisher severity

No explicit severity was provided.

Event
#26426 · Revision 1
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Publisher date
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